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preliminary rev. 0.7 3/05 copyright ? 2005 by silicon laboratories si2457/34/15/04-si3008 this information applies to a product under development. its characteristics and specifications are subject to change without n otice. ordering information this data sheet is valid only for those chipset combinations listed on page page 68. pin assignments clkin/xtali 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 xtalo ri v d rxd txd cts reset c2a c1a int gnd v a esc dcd rts 1 si2457/34/15/04 (16-pin option) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 si2457/34/15/04 (24-pin option) clkin/xtali xtalo clkout/eecs/a0 fsync/d6 vd3.3 gnd vda rts/d7 rxd/rd txd/wr cts/cs reset aout/int ri/d1 sdi/eesd/d2 vdb vd3.3 esc/d3 dcd/d4 gnd sdo/eeclk/d5 int/do c1a c2a ignd c1b c2b cid rx dct qb 8 1 7 2 6 3 5 4 si3008 qe 9 vreg si2457/34/15/04-si3008 v.90, v.34, v.32 bis , v.22 bis iso modem ? with i ntegrated daa features applications description the isomodem ? family of products is a complete modem ranging in speed from 56,000 bps to 2400 bps. offered as a chipset with the si2457, si2434, si2415, or si24 04 system-side device and the si3008 line-side device, the isomodem utilizes the si licon laboratories patented direct access arrangement (daa) technology to provide a programmable telephone line interface with an unparalleled level of integration. these compact solutions eliminate the need for a separate dsp, modem controller, codec, transformer, relay, opto-iso lators, clocking crystal, and 2-4 wire hybrid. available with a system-side packaging option of either a 16-pin soic or a 24-pin tssop, these devices are ideal for embedded modem applications due to their flexibility, small footprint, and minimal external components. functional block diagram data modem formats itu-t, bell 300 bps up to 56 kbps v.21,v.22, v.29 fast connect v.42, v.42bis, mnp2-5 automatic rate negotiation type i and ii caller id decode no external rom or ram required uart or parallel interface at command set support sms / mms support integrated daa over 6000 v capacitive isolation parallel phone detect compliant with fcc, jate, and other ptts overcurrent detection 27 mhz clock input 3.3 v power firmware upgradeable eeprom interface lead-free, rohs compliant packages set-top boxes point-of-sale terminals text/video telephones digital video recorder digital televisions remote monitoring serial interface parallel interface microcontroller dsp daa interface ram/rom pll clocking si3008 clkin/xtali xtalo clkout rxd txd cts rts dcd esc ri int reset to phone line aout data bus cs wr rd a0 d0-d7 isob
si2457/34/15/04-si3008 2 preliminary rev. 0.7
si2457/34/15/04-si3008 preliminary rev. 0.7 3 t able of c ontents section page 1. electrical specificat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3. bill of materials: si2457/34/ 15/04 chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4. functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 4.1. serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 4.2. parallel interface (24- pin version only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.3. command mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 4.4. data mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 4.5. fast connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.6. v.80 synchronous access mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7. clocking/low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.8. data compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.9. error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.10. wire mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.11. caller id operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 4.12. parallel phone detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.13. overcurrent detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.14. firmware upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4.15. sms / mms support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.16. codec interface (24-pin version only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.17. eeprom interface (24- pin version only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4.18. at commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4.19. extended at co mmands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5. s-registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 6. user-access registers (u-reg isters) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.1. bit-mapped u-regist er detail (defaults in bold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7. parallel interface registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8. pin descriptions: si 2457/34/15/04 (16-pin option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 9. pin descriptions: si 2457/34/15/04 (24-pin option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 10. pin descriptions: si3008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 7 11. ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 12. package outline: 24-pi n tssop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 13. package outline: 16-pin soic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 14. package outline: 8-pin exposed pa d soic (si3008) . . . . . . . . . . . . . . . . . . . . . . . . . . 71 contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
si2457/34/15/04-si3008 4 preliminary rev. 0.7 1. electrical specifications table 1. recommended operating conditions parameter 1 symbol test condition min 2 typ max 2 unit ambient temperature t a f-grade 0 25 70 c si2457/34/15/04 supply voltage, digital 3 v d 3.0 3.3 3.6 v notes: 1. the si2457/34/15/04 specifications are guaranteed when the typical application circuit (including component tolerance) and any si2457/34/15/04 and any si 3008 are used. see "2. typical a pplication schematic" on page 10. 2. all minimum and maximum specifications are guaranteed and apply across the recommended operating conditions. typical values apply at nominal supply voltages and an operating temperature of 25 c unless otherwise stated. 3. the digital supply, v d , operates from 3.0 to 3.6 v. the si2457/34/15/04 interface supports 5 v logic (clkin/xtali supports 3.3 v logic only). table 2. loop characteristics (v d = 3.0 to 3.6 v, t a = 0 to 70 c for k-grade) parameter symbol test condition min typ max unit dc termination voltage v tr i l =20ma ? 6.8 7.7 v dc termination voltage v tr i l = 120 ma 9 17.2 ? v on-hook leakage current i lk v tr = ?100 v ? ? 12 a operating loop current i lp 15 ? 120 ma dc ring current dc current flowing through ring detection circuitry ?1.5 5 a ring detect voltage 1 v rd 10 15 35 v rms ring frequency f r 15 ? 68 hz ringer equivalence number ren ? ? 0.2 notes: 1. the ring signal is guaranteed to not be detected below the minimum. the ring signal is guaranteed to be detected above the maximum.
si2457/34/15/04-si3008 preliminary rev. 0.7 5 figure 1. test circuit for loop characteristics table 3. dc characteristics, v d = 3.0 to 3.6 v (v d = 3.0 to 3.6 v, t a = 0 to 70 c for f-grade) parameter symbol test condition min typ max unit high level input voltage v ih 2.0 ? ? v low level input voltage v il ??0.8v high level output voltage v oh i o =?2ma 2.4 ? ? v low level output voltage v ol i o = 2 ma ? ? 0.35 v input leakage current i l ?10 ? 10 a pullup resistance pins 3, 4, 9, 11, 15, 16, 17, 18, 23, 24 (24-pin option) r pu 50 125 200 k ? pullup resistance pins 3, 5, 7, 9,11, 15, 16 (16-pin option) r pu 50 125 200 k ? total supply current * i d v d3.3 pin ? 26 35 ma total supply current, powerdown * i d pdn = 1 ? 80 ? a *note: all inputs at 0 or v d . all inputs held static except clock and all outputs unloaded (static i out = 0 ma). si3008 tip ring 10 f 600 ? i l v tr + ?
si2457/34/15/04-si3008 6 preliminary rev. 0.7 table 4. ac characteristics (v d = 3.0 to 3.6 v, ta = 0 to 70 c for k-grade, fs = 8 khz) parameter symbol test condition min typ max unit sample rate fs ? 8 ? khz clock input frequency f xtl default ? 4.9152 ? mhz clock input frequency f xtl > 10 k ? resistor between pin 23 and gnd ?27?mhz receive frequency response low ?3 dbfs corner, filt = 0 ? 5 ? hz receive frequency response low ?3 dbfs corner, filt = 1 ? 200 ? hz transmit full scale level 1 v fs ?1 dbm ? 0.98 ? v peak receive full scale level 1,2 v fs ?1 dbm ? 0.98 ? v peak dynamic range 3 dr i l = 100 ma ? 80 ? db dynamic range 3 dr i l =20ma ? 80 ? db transmit total harmonic distortion 4 thd i l =20ma ? ?75 ? db dynamic range (caller id mode) dr cid vin = 1 khz, ?13 dbm ? 50 ? db notes: 1. measured at tip and ring with 600 ? termination at 1 khz, as shown in figure 1 on page 5. 2. receive full scale level produces ?0.9 dbfs at dtx. 3. dr = 20 x log |vin| + 20 x log (rms signal/rms noise). applies to both transmit and receive paths. vin = 1 khz, ?3 dbfs. 4. vin = 1 khz, ?3 dbfs. thd = 20 x log (rms distortion/rms signal). table 5. absolute maximum ratings parameter symbol value unit dc supply voltage v d 4.1 v input current, si2457/34/15/04 digital input pins i in 10 ma digital input voltage v ind ?0.3 to 5.3 v clkin/xtali input voltage v xind ?0.3 to (v d + 0.3) v operating temperature range t a ?10 to 100 c storage temperature range t stg ?40 to 150 c note: permanent device damage may occur if the above absolu te maximum ratings are exceeded. functional operation should be restricted to the conditions as specified in the operational sections of this data sheet. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
si2457/34/15/04-si3008 preliminary rev. 0.7 7 table 6. switching characteristics (v d = 3.0 to 3.6 v, t a = 0 to 70 c for f-grade) parameter symbol min typ max unit clkout output clock frequency 2.048 ? 49.152 mhz baud rate accuracy t bd ?1 ? 1 % start bit to rts t rth ?1/(2 x baud rate) ?ns cts or rts high to start bit t rts 10 ? ? ns stop bit to cts t cth ???n s reset to reset t rs 5.0 ? ? ms reset to 1st at command t at 300 ? ? ms address setup t as 15 ? ? ns address hold t ah 0??n s wr low pulse width t wl 50 ? ? ns write data setup time t wdsu 20 ? ? ns write cycle time t wc 120 ? ? ns chip select setup t css 10 ? ? ns chip select hold t csh 0??n s rd low pulse width t rl 50 ? ? ns rd low to data driven time t rldd ? ? 20 ns data hold t dh 10 ? ? ns rd high to hi-z time t dz ? ? 30 ns read cycle time t rc 120 ? ? ns note: all timing is referenced to the 50% level of the waveform. input test levels are v ih =v d ? 0.4 v, v il =0.4v
si2457/34/15/04-si3008 8 preliminary rev. 0.7 figure 2. asynchronous uart serial interface timing diagram uart time for modem receive path (8n1 mode) uart timing for modem transmit path (9n1 mode with 9th bit escape) 8-bit data mode d0 d1 d2 d3 d4 d5 d6 d7 d0 d1 d2 d3 d4 d5 d6 esc d7 stop stop start start t rts t rth rts cts rx tx t rts t cth 9-bit data mode
si2457/34/15/04-si3008 preliminary rev. 0.7 9 figure 3. parallel interface read timing figure 4. parallel interface write timing t csh t css t as t ah address = 0 or 1 t rl t rc t rldd t dh t rldd valid data valid data a0 d[7:0] cs rd t dz t csh t css t as t ah t wc t wl address = 0 or 1 t wdsu t dh valid data valid data a0 d[7:0] cs wr
si2457/34/15/04-si3008 10 preliminary rev. 0.7 2. typical application schematic rts_ dcd_ esc int_ txd reset_ rxd cts_ ri_ vdd tip ring refer to an93 appendix a for layout guidelines. please submit layout to silicon labs for review prior to pcb fabrication. external crystal option note: z1 can be replaced by an mov or mlv. ferrite beads are used for best emi performance. in some situations, r 15/r16 can be replaced with 0 ohm resistors. r15 r4 rv1 c9 r12 c2 r2z r8 q2 q3 y1 1 2 r1z r18 r6 u2 c1b 1 c2b 2 vreg 3 cid 4 rx 8 dct 7 ignd epad 9 qe 5 qb 6 c5 r13 r10 r20 r1y r19 z1 c51 c1 r2x c8 - + d1 c11 fb1 r16 c4 r2y q1 c41 c40 r7 c3 r21 fb2 r5 u1 si2457-fs clkin/xtali 1 xtalo 2 ri 3 vd 4 rxd 5 txd 6 cts 7 reset 8 c2a 9 c1a 10 int 11 gnd 12 va 13 esc 14 dcd 15 rts 16 c50 r1x figure 5. typical schematic with 16-pin system-side option
si2457/34/15/04-si3008 preliminary rev. 0.7 11 int_/d0 ri_/d1 eesd/d2 clkout/eecs_/a0 rts_/d7 eeclk/d5 dcd_/d4 esc/d3 aout/int_ txd/wr_ reset_ rxd/rd_ cts_/cs_ d6 vdd tip ring external crystal option note: z1 can be replaced by an mov or mlv. ferrite beads are used for best emi performance. in some situations, r15/r16 can be replaced with 0 ohm resistors. no ground plane in daa section refer to an93 appendix a for layout guidelines. please submit layout to silicon labs for review prior to pcb fabrication. c51 y1 1 2 - + d1 c11 r2x c52 c53 fb1 c40 q1 u1 clkin/xtali 1 xtalo 2 clkout/eecs/a0 3 d6 4 vd3.3 5 gnd 6 vda 7 rts/d7 8 vdb 19 gnd 20 vd 3.3 21 c2a 13 c1a 14 esc/d3 22 dcd/d4 23 eeclk/d5 24 cts/cs 11 rxd/rd 9 txd/wr 10 reset 12 ri/d1 17 eesd/d2 18 aout/int 15 int/d0 16 r1z r21 u2 c1b 1 c2b 2 vreg 3 cid 4 rx 8 dct 7 ignd epad 9 qe 5 qb 6 r7 fb2 c1 c3 r10 c41 r19 r1x rv1 r2y r15 c50 c8 r2z r5 q3 r16 q2 r4 c4 r18 c9 c5 r6 r8 r12 r20 c2 r1y z1 r13 figure 6. typical schematic with 24-pin system-side option
si2457/34/15/04-si3008 12 preliminary rev. 0.7 3. bill of materials: si2457/34/15/04 chipset component value supplier(s) c1, c2 33 pf, y2, x7r, 20% panasonic, murata, vishay c3 10 nf, 250 v, x7r, 20% venkel, smec c4 1.0 f, 25 v, x7r, 20% venkel, smec c5, c50, c52 0.1 f, 16 v, x7r, 20% venkel, smec c8, c9 680 pf, y2, x7r, 10% panasonic, murata, vishay c11 1 330 pf, 50 v, x7r, 20% venkel, smec c40, c41 2 33 pf, 16 v, npo, 5% venkel, smec c51, c53 0.22 uf, 16 v, x7r, 20% venkel, smec d1, d2 3 dual diode, 225 ma, 300 v, cmpd2004s central semiconductor fb1, fb2 ferrite bead, blm18ag601sn1b murata q1, q3 npn, 300 v, mmbta42 onsemi, fairchild q2 pnp, 300 v, mmbta92 onsemi, fairchild rv1 sidactor, 275 v, 100 a teccor, protek, st micro r1 4 205 ? , 1 w, 1% venkel, smec, panasonic r2 5 243 ? , 1 w, 1% venkel, smec, panasonic r4 3.9 k ? , 1/16 w, 5% venkel, smec, panasonic r5, r6 100 k ? , 1/16 w, 5% venkel, smec, panasonic r7, r8 6 10 m ? , 1/16 w, 5% venkel, smec, panasonic r10 1 k ? , 1/16 w, 5% venkel, smec, panasonic r12, r13 56 ? , 1/16 w, 1% venkel, smec, panasonic r15, r16 7 0 ? , 1/16 w venkel, smec, panasonic r18 1.5 m ? , 1/16 w, 5% venkel, smec, panasonic r19 180 k ? , 1/16 w, 5% venkel, smec, panasonic r20, r21 1 3m ? , 1/16 w, 5% venkel, smec, panasonic u1 si2457/34/15/ 04 silicon labs u2 si3008 silicon labs y1 2,8 4.9152 mhz, 20 pf, 100 ppm, 150 ? esr ecs inc., siward z1 9 dual zener diode, 20 v, 1/4 w vishay notes: 1. in applications that do not require call er id c11, r20, and r21 can be removed. 2. in stb applications, c40, c41, and y1 can be removed by using the 27 mhz clock input feature. 3. several diode bridge configurations are acceptable. for example, a single df04s or four 1n4004 diodes may be used. 4. three parallel 619 ? 1/4 w resistors may be used instead of r1. 5. three parallel 732 ? 1/4 w resistors may be used instead of r2. 6. the package size on r7 and r8 must be at least 0805. 7. murata blm18ag601sn1 may be substituted for r15?r16 (0 ? ) to decrease emissions. 8. to ensure compliance with itu specifications, frequency tolerance must be less than 100 ppm including initial accuracy, 5-year aging, 0 to 70 c, and capacitive loadin g. 50 ppm initial accuracy cr ystals typically satisfy this requirement. 9. two series zener diodes may be used instead of z1.
si2457/34/15/04-si3008 preliminary rev. 0.7 13 table 7. protocol characteristics item specification data rate 56 kbps 1 54.666 kbps 1 53.333 kbps 1 52 kbps 1 50.666 kbps 1 49.333 kbps 1 48 kbps 1 46.666 kbps 1 45.333 kbps 1 44 kbps 1 42.666 kbps 1 41.333 kbps 1 40 kbps 1 38.666 kbps 1 37.333 kbps 1 36 kbps 1 34.666 kbps 1 33.333 kbps 1 32 kbps 1 30.666 kbps 1 29.333 kbps 1 28 kbps 1 33.6 kbps 2 31.2 kbps 2 28.8 kbps 2 26.4 kbps 2 24.0 kbps 2 21.6 kbps 2 19.2 kbps 2 16.8 kbps 2 14.4 kbps 3 12.0 kbps 3 9600 bps 3 7200 bps 3 4800 bps 3 2400 bps 1200 bps 300 bps 300 bps itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.90 1 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 2 itu-t v.34 or v.32bis 3 itu-t v.34 or v.32bis 3 itu-t v.34, v.32bis, or v.29 3 itu-t v.34 or v.32bis 3 itu-t v.34 or v.32bis 3 itu-t v.34 or v.22bis 3 itu-t v.22bis, v.23, or bell 212a itu-t v.21 bell 103 data format bit asynchronous selectable 8, 9, 10, or 11 bits per character notes: 1. supported on si2457 only. 2. supported on si2457 and si2434 only. 3. supported on si2457, si2434, and si2415 only.
si2457/34/15/04-si3008 14 preliminary rev. 0.7 compatibility itu-t v.90 1 , v.34 2 , v.32bis, v.32, v.23, v.22bis, v.22, v.21, bell 212a, and bell 103 operating mode switched network two-wire full duplex data modulation 28 to 56 kbps 1 2.4 to 33.6 kbps 2 14.4 kbps 3 12.0 kbps 3 9600 bps 3 9600 bps 3 9600 bps 3 7200 bps 3 4800 bps 3 2400 bps 1200 bps 0 to 300 bps v.90 as specified by itu-t v.34 as specified by itu-t 128-level tcm/2400 baud 0.01% 64-level tcm/2400 baud 0.01% 32-level tcm/2400 baud 0.01% 16-level qam/2400 baud 0.01% v.29 qam as specified by itu-t 16-level tcm/2400 baud 0.01% 4-level qam/2400 baud 0.01% 16-level qam/600 baud 0.01% 4-level psk/600 baud 0.01% fsk 0?300 baud 0.01% answer tone itu-t v.32bis, v.32, v.22bis, v.22, and v.21 modes bell 212a and 103 modes 2100 hz 3 hz 2225 hz 3 hz transmit carrier v.90 1 v.34 2 itu-t v.32bis 3 itu-t v.32 3 itu-t v.29 3 itu-t v.22, v.22bis/bell 212a originate mode answer mode itu-t v.21 originate mode answer mode bell 103 originate mode answer mode as specified by itu-t as specified by itu-t 1800 hz 0.01% 1800 hz 0.01% 1700 hz1 hz 1200 hz 0.5 hz 2400 hz 1 hz mark (980 hz 12 hz) space (1180 hz 12 hz) mark (1650hz 12hz) space (1850hz 12hz) mark (1270hz 12hz) space (1070hz 12hz) mark (2225hz 12hz) space (2025hz 12hz) output level permissive?switched network ?9 dbm maximum table 7. protocol characteristics (continued) item specification notes: 1. supported on si2457 only. 2. supported on si2457 and si2434 only. 3. supported on si2457, si2434, and si2415 only.
si2457/34/15/04-si3008 preliminary rev. 0.7 15 receive carrier itu-t v.90 1 itu-t v.34 2 itu-t v.32bis 3 itu-t v.32 3 itu-t v.29 3 itu-t v.22, v.22bis/bell 212a originate mode answer mode itu-t v.21 originate mode answer mode bell 103 originate mode answer mode as specified by itu-t as specified by itu-t 1800 hz 7 hz 1800 hz 7 hz 1700 hz 7 hz 2400 hz 7 hz 1200 hz 7 hz mark (980 hz 12 hz) space (1180 hz 12 hz) mark (1650hz 12hz) space (1850hz 12hz) mark (2225hz 12hz) space (2025hz 12hz) mark (1270hz 12hz) space (1070hz 12hz) carrier detect (level for itu-t v.22bis, v.22, v.21, 212, 103) in switched network acquisition (?43 dbm) release (?48 dbm) hysteresis 2 dbm minimum note: itu-t v.90 1 , v.34 2 , v.32/v.32bis 3 are echo canceling protocols that use signal quality as criteria for maintaining connection. they also provide for self-training detection to force disconnect. dte interface eia/tia-232-e (itu-t v.24/v.28/iso 2110) line equalization automatic adaptive connection options loss of carrier in itu-t v.22bis and lower phone types 500 (rotary dial), 2500 (dtmf dial) dialing pulse and tone dtmf output level per part 68 pulse dial ratio make/break: 39/61% ring cadence on 2 seconds; off 4 seconds call progress monitor busy connect (rate) no answer no carrier no dialtone ok ring ringing table 7. protocol characteristics (continued) item specification notes: 1. supported on si2457 only. 2. supported on si2457 and si2434 only. 3. supported on si2457, si2434, and si2415 only.
si2457/34/15/04-si3008 16 preliminary rev. 0.7 4. functional description the si2457/34/15 /04 isomodem? utilizing the si3008 line-side device is a complete embedded modem chipset with integrated direct access arrangement (daa). available in two small packages, this solution includes a dsp data pump, modem controller, on-chip ram and rom, codec, daa, analog output, and 27 mhz clock input. the si2457/34/15/04 accepts standard modem at commands and provides connect rates up to 56/33.6/ 14.4/2.4 kbps full-duplex over the public switched telephone network (pstn). the si2457/34/15/04 features a complete set of modem protocols including all itu-t standard formats up to 56 kbps. to provide the most flexibility, the si2457/34/15/04 isomodem system-side device is offered in either a 24- pin tssop or a 16-pin s oic package. the 16-pin version is footprint-compatible with the si2401 isomodem and is recommended for most applications. the 16-pin version does not support the parallel, eeprom or voice codec interf ace. if these features are required, customers should use the 24-pin version. the isomodem provides numerous additional features for embedded modem applications. the modem includes full type i and type ii caller id detection and decoding, call progress monitoring through standard result codes, error correction, data compression, an optional eeprom or parallel interface, autobaud, and fast connect modes. in addition, because the si2457/34/15/04 isomodem integrates the daa, analog f eatures, such as parallel phone, line-in-use, and overcurrent detection are included. this device is ideal for embedded modem applications due to its simple host interface, small board space, and low power consumption. the si2457/34/15/04 solution utilizing silicon laboratories? si3008 proprietary daa can be programmed to meet international requirements and is compliant with fcc, jate, and numerous other country-specific ptt specifications as shown in table 8. also, the si3008 meets the most stringent global requirements for out-of-band energy, emissions, immunity, lightning surges, and safety. the si2457/34/15/04 allows for rapid integration into existing modem applications by providing a serial interface that can directly communicate to either a microcontroller via a uart in terface or a pc via an rs- 232 port. this interface allows for pc evaluation of the modem immediately upon powerup via the at commands using standard terminal software. the si2457/34/15/04 also provides an 8-bit parallel port. 4.1. serial interface the si2457/34/15/04 supports asynchronous serial communication with data terminal equipment (dte) at rates up to 307.2 kbps with the standard serial uart format. upon powerup, the uart baud rate is automatically detected using the autobaud feature. the serial interface also pr ovides a hardware pin, dcd (data carrier detect), which remains low as long as the isomodem is connected. the int interrupt pin can be programmed to alert the host of changes to the interrupts listed in i/o control 0 (u70). to ensure backward compatability when using a 24-pin system side option, if a pulldown resistor 10 k ? is placed between d2 (si2457/ 34/15/04, pin 18) and gnd (si2457/34/15/04, pin 6), th e dte rate is set to a 19.2 kbps baud rate (see table 9). 4.1.1. autobaud the si2457/34/15/04 includes an automatic baud rate detection feature that allows the host to start transmitting data at any standard dte rate from 300 bps to 307.2 kbps. this feature is enabled by default. 4.2. parallel interf ace (24-pin version only) the si2457/34/15/04 digital i/o can communicate via a table 8. country-specific ptt specifications country argentina kuwait brazil macao canada malaysia* chile mexico china oman colombia pakistan ecuador peru egypt romania el salvador russia guam saudi arabia hong kong singapore hungary slovakia india syria indonesia taiwan japan uae jordan usa kazakhstan yemen *note: supported for loop currents > 20 ma.
si2457/34/15/04-si3008 preliminary rev. 0.7 17 parallel interface. the paralle l interface is an 8-bit data bus with a single bit address. figure 3 on page 9 shows the required timing for the parallel interface. if a0 = 0, the data bus represents a read/write to the ? parallel interface 0 (0x00)? register on page page 62. if a0 = 1, the data bus represents a read/write to the ? parallel interface 1 (0x01)? register on page page 63). selection of a serial or parallel i/o interface is determined by the state of aout/int (si2457/34/15/04, pin 15) during the ri sing edge of reset . an internal pullup resistor forces the default state to serial mode operation. an external 10 k ? pulldown resistor can be connected to aout/int to force selection of parallel mode (see table 9). configuration of pins 3, 4, 8?11, 15?18, and 22?24 is determined by this interface selection. 4.3. command mode upon reset, the isomodem ? is in command mode and accepts ?at? commands. an outgoing modem call can be made using the ?atdt#? (tone dial) or ?atdp#? (pulse dial) command after the device is configured. if the handshake is successful, the modem responds with the response codes detailed in table 15 on page 35 and enters data mode. 4.4. data mode the si2457/34/15/04 isomodem is in data mode while it has a telephone line connection to another modem or is in the process of establishing a connection. data protocols are available to provide error correction to improve reliability (v .42 and mnp2-4) and data compression to increase throughput (v.42bis and mnp5). each connection between two modems in data mode begins with a handshaking sequence. during this sequence, the modems determine the line speed, data protocol, and related parameters for the data link. configuration through at commands determines the range of choices available to the modem during the negotiation process. 4.5. fast connect the si2457/34/15/04 supports a fast connect mode of operation to reduce the time of a connect sequence in originate mode. the fast connect modes can be enabled for v.21, v.22, bell103, and v.29 modulations. see ?an93: modem designer?s guide? for details. 4.6. v.80 synchronous access mode the si2457/34/15/04 supports a v.80 synchronous access mode of operation, which operates with an asynchronous dte and a synchronous dce. see ?an93: modem designer?s guide? for complete details. 4.7. clocking/low power modes the si2457/34/15/04 contains an on-chip phase-locked loop (pll) and clock generator. using either a single crystal or master clock input, the si2457/34/15/04 can generate all the internal clocks required to support the featured modem protocols. either a 27 mhz or 4.9152 mhz clock (3.3 v max input?see table 5 on page 6) on xtali or a 4.9152 mhz crystal across xtali and xtalo form the master clock (100 ppm max) for the isomodem. this clock source is sent to an internal pll that generates all necessary internal system clocks including the dsp clock. by default, the si2457/34/15/ 04 assumes a 4.9152 mhz clock input. if a 27 mhz clock on xtali is used with the serial (uart) interface, a pulldown resistor < 10 k ? must be placed between dcd and gnd. if a 27 mhz clock on xtali is used with the parallel interface, a pulldown resistor < 10 k ? must be placed between cts /cs (pin 11) and gnd and aout/int and gnd (see tables 9 and 10). using the s24 s-register, the si2457/34/15/04 can be set to automatically enter sleep mode after a pre- programmed time of inactivity with either the dte or the remote modem. the sleep mode is entered after (s24) seconds have passed since the tx fifo has been empty. the isomodem remains in the sleep state until either a 1 to 0 transition on txd (serial mode) or a 1 to 0 transition on cs (parallel mode) occurs. additionally, the si2457/34/15/04 may be placed in a complete powerdown mode or wake-on-ring mode. complete powerdown is accomplished via u65[13] (pdn). once the pdn bit is written, the si2457/ 34/15/04 completely powers down and can only be powered back on via the reset pin. table 9. pulldown selector (24-pin ssd) mode serial i/o parallel i/o 4.9152 mhz clk default pin 15 27 mhz clk pin 23 pin 11, 15 autobaud default n/a 19.2 kbps dte pin 18 no eeprom default n/a eeprom pin 4 table 10. pulldown selector (16-pin version) mode serial i/o 4.9152 mhz clk default 27 mhz clk pin 15
si2457/34/15/04-si3008 18 preliminary rev. 0.7 4.8. data compression the modem can achieve dte (host-to-isomodem) speeds greater than the maximum dce (modem-to- modem) speed through the use of a data compression protocol. the compression protocols available are the itu-t v.42bis and mnp5 protocols. data compression attempts to increase throughput by compressing the data before actually sending it. thus, the modem is able to transmit more data in a given period of time. 4.9. error correction the si2457/34/15/04 isomodem can employ error correction (reliable) protocols to ensure error-free delivery of asynchronous data sent between the host and the remote end. the si2457/34/15/04 supports v.42 and mnp2-4 error correction protocols. v.42 (lapm) is most commonly used and is enabled by default. 4.10. wire mode wire mode is used to communicate with standard non- error correcting modems. w hen optioned with \n3, the si2457/34/15/04 falls back to wire mode if it fails in an attempt to negotiate a v.42 link with the remote modem. error correction and data compression are not active in wire mode. 4.11. caller id operation the si2457/34/15/04 supports full type i and type ii caller id detection and decode. caller id is supported for the us bellcore, european etsi, uk, and japanese protocols and is enabled via the +vcid, +vcdt, and +pcw commands. 4.12. parallel phone detection the isomodem ? is able to detect when another telephone, modem, or other device is using the phone line. this allows the host to avoid interrupting another phone call when the phone line is already in use and to intelligently handle an interruption when the isomodem is using the phone line. 4.12.1. on-hook line-in-use detection when the isomodem is sharing the telephone line with other devices, it is important that it not interrupt a call in progress. to detect whether another device is using the shared telephone line, the host can use the isomodem to monitor the tip-ring dc voltage with the line voltage sense (lvs) register (u6c, bits 15:8). the lvs bits have a resolution of 1 v per bit with an accuracy of approximately 10%. bits 0 through 6 of this 8-bit signed twos complement number indicate the value of the line voltage, and the sign bit (bit 7) indicates the polarity of tip and ring. the isomodem can also monitor the tip-ring dc voltage using the lvcs register (u79, bits 4:0). see figure 7 on page 19. see also the %vn commands for automatic line-in-use detection. 4.12.2. off-hook intrusion detection when the isomodem is off-hook, an algorithm is implemented in the isomodem to automatically monitor the tip-ring loop current via the lvcs register. during the off-hook state, the lv cs register switches from representing the tip-ring voltage to representing the tip-ring current. see figure 8 on page 19. upon detecting an intrusion, the isomodem alerts the host of the condition via the int pin.
si2457/34/15/04-si3008 preliminary rev. 0.7 19 figure 7. loop voltage figure 8. loop current 0 3 6 9 121518 21242830 333639 42454751 5457 6063666972 100 0 5 75 78 81 84 87 lvc s bits loop voltage (v) 10 15 20 25 30 0 3 6 9 12 15 18 21 24 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 140 75 78 81 84 87 90 93 loop current (ma) lvcs bits 27 overload 0 5 10 15 20 25 30 ctr21 only
si2457/34/15/04-si3008 20 preliminary rev. 0.7 4.13. overcurrent detection the si2457/34/15/04 includes an overcurrent detection feature that measures the loop current at a programmable time after the si2457/34/15/04 goes off- hook. this allows the si2457/ 34/15/04 to detect if it is connected to an improper telephone line. the overcurrent detection feature may be enabled by setting the ocdm bit (u70, bit 11). oht (u77, bits 8:0) sets the delay after off-hook until the loop current is measured. see ?an93: modem designer?s guide? for details. 4.14. firmware upgrades the si2457/34/15/04 contains an on-chip program rom that includes the firmware required for the features listed in this data sheet. in addition, the si2457/34/15/04 contains on-chip program ram to accommodate minor changes to the rom firmware . this allows silicon labs to provide future firmware updates to optimize the characteristics of new modem designs and those already deployed in the field. see ?an93: modem designer?s guide? for complete details. 4.15. sms / mms support the si2457/34/15/04 supports v.23 half-duplex. this modulation provides the low-level functionality needed for sms and mms protocols. see ?an93: modem designer?s guide? for complete details. 4.16. codec interface (24-pin version only) in order to support a full range of voice and data applications, the si2457/34/15/04 includes an optional serial interface that connects to an external voice codec (si3000). see ?an93: modem designer?s guide? for complete details. 4.17. eeprom interface (24-pin version only) the si2457/34/15/04 supports an optional serial peripheral interface (spi) bus serial eeprom mode 3 with a 16-bit (8?64 kbit range) address. upon powerup, if a pulldown resistor 10 k ? is placed between d6 (si2457, pin 4) and gnd (see table 9), the isomodem attempts to detect an eeprom. the eeprom is intended first for setting cu stom defaults , second for automatically loading firmware upgrades, and third to allow for user-defined at command macros for use in custom at commands or country codes. see ?an93: modem designer?s guide? for complete details. 4.18. at commands at powerup, the si2457/34/15/04 is in the at command mode. in command mode, the modem monitors the input (serial or parallel) c hecking constantly for a valid command (at commands are described in table 11.)
si2457/34/15/04-si3008 preliminary rev. 0.7 21 table 11. basic at command set (command defaults in bold) command action $ display at command mode settings. a answer incoming call a/ re-execute last command. this is the only command not preceded by ?at? or followed by a . dn dial the dial command, followed by 1 or more dial command modifiers, manually dials a phone number: modifier function ! or & flash hook switch for fht (u4f) ms (default: 500 ms) , or < pause before continuing for s8 seconds (default: 2 seconds) ; return to at command mode @ wait for silence. g polarity reversal detect. by placing the ?g? character in the dial string (i.e. atdtg1 ), the si2457 /34/15/04 will monitor the telephone line for polarity reversals. if a busy tone is detected, the si2457/34/15/0 4 will report ?polarity reversal? if a polarity reversal was detected or ?no polarity reversal? if a polarity reversal was not detected. in each case, the result code is followed by ?ok?. if the s7 timeout occurs before a busy tone is detected, the si2457/34/15/04 will report ?no carrier?. pola rity reversal monitoring begins after the last digit is dialed and ends when the busy tone is detected or s7 timeout occurs. note: it is not possible to establish a modem connection when using this command. l redial last number. p pulse (rotary) dialing?pulse digi ts: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 t tone (dtmf) dialing?dtmf digi ts: *, #, a, b, c, d, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. w wait for dial tone before continuing for s14 seconds (default: 12 seconds). blind dialing modes x0, x1 and x3 do not affect the w command. if the dop bit (u7a, bit 7) is set, the ?atdtw? com- mand will cause the isomodem? to pause dialing and either report an ?ok? if a dialtone is detected or ?no dialtone? if a dial tone is not detected. en local dte echo e0 disable e1 enable hn hook switch. h0 go on-hook (hang up modem).
si2457/34/15/04-si3008 22 preliminary rev. 0.7 h1 go off-hook. in identification and checksum. i0 display si2457/34/15/04 revision code. b: revision b c: revision c, etc. i1 display si2457/34/15/04 firmwar e revision code (numeric). i3 display line-side revision code. 08c = si3008 revision c i6 display the isomodem? model number. ?2404? = si2404 ?2415? = si2415 ?2434? = si2434 ?2457? = si2457 i7 diagnostic results 1. see ?an93: modem designer?s guide? for details. i8 diagnostic results 2. see ?an93: modem designer?s guide? for details. ln speaker volume operation l1 low speaker volume l2 medium speaker volume l3 high speaker volume mn speaker operation (via aout). m0 speaker is always off. m1 speaker is on while dialing and handshaking; off in data mode. m2 speaker is always on. m3 speaker is off while dialing, on during handshaking and retraining. on return to data mode from command mode operation. o0 return to data mode. o1 return to data mode and perform a full retrain (at any speed except 300 bps). o2 return to data mode and perform rate renegotiation. qn response mode. q0 enable result codes (see table 15 on page 35) q1 disable result codes (enable quiet mode). r initiate v.23 reversal. sn s-register operation (see table 16 on page 38). s$ list contents of all s registers. sn? display contents of s-register n. sn=x set s-register n to value x (where n and x are decimal values). vn result code type (see table 15 on page 35). v0 numeric result codes. v1 verbal result codes table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 preliminary rev. 0.7 23 xn call progress monitor (cpm)?this command controls which cpm signals are monitored and reported to the host from the si2 457/34/15/04. (see table 15 on page 35.) x0 basic results; disable cpm?blind dial (does not wait for dial tone). connect message does not include speed. x1 extended results; disable cpm?blind dial. connect message includes speed. x2 extended results and detect dial tone only?add dial tone detection to x1 mode. does not blind dial. x3 extended results and detect busy only? add busy tone detection to x1 mode. x4 extended results, full cpm?full cpm enabled, connect message includes speed. x5 extended results?full cpm enabled including ringback detection. adds ringback detection to x4 mode. yn long space disconnect?modem hangs up after 1.5 seconds or more of continuous space while on-line. y0 disable. y1 enable. z hard reset?this co mmand is functiona lly equivalent to pulsing the reset pin low. (see t at in table 6 on page 7.) :e read from serial eeprom. :i interrupt read?this command causes the isom odem? to report the lower 8 bits of the interrupt register i/o control 0 (u70). the cid, ocd, ppd, and ri bits also are cleared, and the int pin (int bit in parallel mode) is deactivated on this read. :m write to serial eeprom. :p program ram write?this command is used to upload firmware supplie d by silicon labs to the si2457/34/15/04. the format for this co mmand is at:paaaa,xxxx,yyyy,.... where aaaa is the first address in hexadecimal and xxxx,yyyy, .... is data in hexadecimal. only one :p com- mand is allowed per at comm and line. no other commands can be concatenated in the :p command line. this command is only for use with special files pr ovided by silicon laborato- ries. do not attempt to use this command for any other purpose. :r user-access register read?this command allows the user to read from the user-access registers. (see pages page 41?page 58.) the format is ?at:raa?, where aa = user-access address in hexadecimal. the ?at:r? command causes all the u- registers to be displayed. :u user-access register write?this command allows the user to write to the 16-bit user- access registers. (see page page 41.) t he format is ?at:uaa,xxxx,yyyy,zzzz,...? where aa = user-access address in hexadecimal. xxxx = data in hexadecimal to be written to location aa. yyyy = data in hexadecimal to be written to location (aa + 1). zzzz = data in hexadecimal to be written to location (aa + 2). etc. table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 24 preliminary rev. 0.7 +dr=x data compression reporting. x mode 0 disabled 1 enabled if enabled, the intermediate result code is tran smitted at the point after error control negotia- tion. the format of this result code is as follows: result code mode +dr:none data compression is not in use +dr:v42b rec. v.42bis is in use in both directions +dr:v42b rd rec. v.42bis is in use in receive direction only +dr:v42b td rec. v.42bis is in use in transmit directions only +ds options +ds = a +ds = a,b +ds = a,b,c +ds = a,b,c,d controls v.42bis data compression function. a direction 0 no compression 1 transmit only 2 receive only 3 both directions b compression_negotiation 0 do not disconnect if v.42 is not negotiated. 1 disconnect is v.42 is not negotiated. c maximum dictionary size 512 d maximum string size 6 to 250 (28 default) +es options +es = a +es = a,,c enable synchronous access mode. a specifies the mode of operation wh en initiating a modem connection. d disable synchronous access mode. 6 enable synchronous access mode when connection is completed and data state is entered. b specifies fallback mode of operation. this parameter should not be used. c specifies the mode of operation when answer a modem connection. d disable synchronous access mode. 8 enable synchronous access mode when connection is completed and data state is entered. table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 preliminary rev. 0.7 25 +esa options +esa = a +esa = a,b +esa = a,b,c +esa = a,b,c,e +esa = a,b,c,e,f +esa = a,b,c,e,f, g synchronous access mode control options a specifies action taken if an underrun condition occurs during transparent sub-mode. 0 modem transmits 8-bit syn sequences on idle. b specifies action taken if an underrun condition occurs after a flag during framed sub- mode 0 modem transmits 8-bit hdlc flags on idle. c specifies action taken if an underrun or overrun condition occurs after a non-flag dur- ing framed sub-mode. 0 modem transmits abort on underrun in middle of frame. 1 modem transmits flag on underrun in middle of frame and notifies host of underrun or overrun. d specifies v.34 half duplex operation. this parameter should not be used. e specifies crc polynomial used while in framed sub-mode. 0 crc generation checking disable. 1 16-bit crc generation and checking is performed by the modem. f specifies nrzi encoding and decoding. 0 nrzi encoding and decoding disabled. g specifies syn. 255 +fclass = x class 1 mode enable fo r v.29 fast connect. x mode 0off 1 enables support for class 1 mode for use in the v.29 fast connect mode. +frm = x class 1 receive carrier for v.29 fast connect. x mode 2 transmit v.21 (980 hz) tone for longer than 100 ms, then send answer tone (2100/2225 hz) for 200 ms. 95 v.29 short synchronous. 96 v.29 full synchronous. +ftm = x class 1 transmit carrier for v.29 fast connect. x mode 2 transmit v.21 (980 hz) tone. 53 same as &t4, but transmit v.29 7200 bps. data pattern set by s40 register. at + fclass = 0 must be sent to restore the isomodem? to normal operation after test. 54 same as &t4, but transmit v.29 9600 bps. data pattern set by s40 register. at + fclass = 0 must be sent to restore the isomodem to normal operation after test. 95 v.29 short synchronous. 96 v.29 full synchronous. table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 26 preliminary rev. 0.7 +gci = x country settings - automatically configure all registers for a particular country. x country 0 japan 16 brazil 20 canada 26 china 27 columbia 35 ecuador 50 hong kong 51 hungary 53 india 6c malaysia 73 mexico 89 philippines 8a poland 9c singapore b8 russia b5 united states fe taiwan note: u-registers are configured to silicon laborat ories? recommended values. the +gci command resets the u-registers and the s7 and s6 s-regist ers to default values before setting country- specific values. changes may be made by writing individual registers after sending the at+gci command. refer to ?an93: modem designer?s guide? for details. +gci? list current country code sett ing (response is: + gci:) +gci = ? list all possible country code settings. +ifc options +ifc = a +ifc = a,b specifies the flow control to be implemented. a specifies the flow control method used by the host to control data from the modem 0 none 1 local xon/off flow control. does not pass xon/xoff character to the remote modem. 2 hardware flow control (rts) b specifies the flow control method used by the modem to control data from the host 0 none 1 local xon/off flow control. 2 hardware flow control (cts). +itf options +itf = a +itf = a,b +itf = a,b,c transmit flow control threshold. a threshold above which the modem will generate a flow off signal <0 to 511> bytes b threshold below which the mo dem will generate a flow on signal <0 to 511> bytes c polling interval for indicator 0 to 300 in 10 msec units. table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 preliminary rev. 0.7 27 +mr = x modulation reporting control. x mode 0 disabled 1 enabled if enabled, the intermediate result code is transmitted at the point during connect negotia- tion. the format of this result code is as follows: +mcr: e.g. +mcr: v32b +mrr: e.g. +mrr: 14400 +ms options +ms = a +ms = a,b +ms = a,b,c +ms = a,b,c,d +ms = a,b,c,d,e +ms = a,b,c,d,e,f modulation selection. a preferred modem carrier v21 itu-t v.21 v22 itu-t v.22 v22b itu-t v.22bis (default for si2404) v32 itu-t v.32 v32b itu-t v.32bis (default for si2415) v34 itu-t v.34 (default for si2434) v90 itu-t v.90 (default for si2457) b automatic modulation negotiation 0 disabled 1 enabled c,d min tx rate/max tx rate are optional nu meric values that specify the lowest value at which the dce may establish a connection. if unspecified (set to 0), they are determined by the carrier and automode settings. e,f min rx rate/max rx rate are optional numeric values which specify the highest value at which the dce may establish a conn ection. if unspecifie d (set to 0), they are determined by the carrier and automode settings. +pcw = x controls the action to be taken upon detection of call waiting. x mode 0 toggle ri and collect type ii caller id if enabled by +vcid. 1 hang up. 2 ignore call waiting. +vcdt = x caller id type. x mode 0 after ring only 1 always on 2uk 3 japan +vcid = x caller id enable. x mode 0off 1 on?formatted 2 on?raw data format +vcidr? type ii caller id information ? the si2493 will display ?+vcdir:? followed by raw caller id information including checksum. table 11. basic at command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 28 preliminary rev. 0.7 4.19. extended at commands the extended at commands are supported by the si2457 /34/15/04 and are described in tables 12 through 14. table 12. extended at& command set (command defaults in bold) command action &$ display at& current settings. &d0 esc is not used &d1 esc escapes to command mode from data mode if also enabled by hes u70, bit 15. &d2 esc assertion during a modem connection causes the modem to go on-hook and return to com- mand mode. &d3 esc assertion causes atz command (reset and return ok result code). &f restore factory default settings. &gn line connection rate limit?this command sets an up per limit on the line speed that the si2457/34/ 15/04 can connect. note that the &hn commands may limit the line speed as well (&gn not used for &h0 or &h1). not all modulation s support rates given by &g. an y improper setting will be ignored. &g3 1200 bps max &g4 2400 bps max (default for si2404) &g5 4.8 kbps max &g6 7.2 kbps max &g7 9.6 kbps max &g8 12 kbps max &g9 14.4 kbps max (default for si2415) &g10 16.8 kbps max &g11 19.2 kbps max &g12 21.6 kbps max &g13 24 kbps max &g14 26.4 kbps max &g15 28.8 kbps max &g16 31.2 kbps max &g17 33.6 kbps max (default for si2457 and si2434) &hn switched network handshake mode?&hn commands must be on a separate command line from atd, ata, or ato commands. &h0 v.90 with automatic fallback (56 kbps to 300 bps) (default for si2457) &h1 v.90 only (56 kbps to 28 kbps) &h2 v.34 with automatic fallback (33.6 kbps to 300 bps) (default for si2434) &h3 v.34 only (33.6 kbps to 2400 bps)
si2457/34/15/04-si3008 preliminary rev. 0.7 29 &h4 itu-t v.32bis with automatic fallback (14.4 kbps to 300 bps) (default for si2415) &h5 itu-t v.32bis only (14.4 kbps to 4800 bps) &h6 itu-t v.22bis only (2400 bps or 1200 bps) &h7 itu-t v.22 only (1200 bps) &h8 bell 212 only (1200 bps) &h9 bell 103 only (300 bps) &h10 itu-t v.21 only (300 bps) &h11 v.23 (1200/75 bps) &pn japan pulse dialing &p0 configure si2457/34/15/04 for 10 pulse- per-second pulse dialing. for japan. &p1 configure si2457/34/15/04 for 20 pulse- per-second pulse dialing. for japan. &tn test mode &t0 cancel test mode (escape to command mode to issue at&t0). this command will also report the number of bit errors encountered on the previous &t4 or &t5 test. &t2 initiate itu-t v.54 (analoop) test. modulation set by &h at command. test loop is through the dsp (si2457/34/15/04 device) only. isomodem? echoes data from tx pin (register 0 in parallel mode) back to rx pin (reg ister 0 in parallel mode). &t3 initiate itu-t v.54 (analoop) test. modulation set by &h at command. test loop is through the dsp (si2457/34/15/04), daa interf ace section (si2457/34/15/04), daa interface (si3008), and ana- log hybrid circuit (si3008). isomodem echoes data from tx pin (register 0 in parallel mode) back to rx pin (register 0 in parallel mode). phone line termination required as in figure 1 . to test only the link operation, the hybrid and afe codec can be removed from the test loop by setting the dl bit (u62, bit 1). &t4 initiate transmit as originating modem with automatic data generation. modulation, data rate, and symbol rate are set by &h, &g, and s41. data patte rn is set by the s40 register. continues until the ath command is sent after an escape into command mode. data is also demodulated as in analoop, and any bit errors are counted to be displayed after the test using &t0. &t5 initiate transmit as answering modem with automatic data generation. modulation, data rate, and symbol rate are set by &h, &g, and s41. data patte rn is set by the s40 register. continues until the ath command is sent after an escape into command mode. data is also demodulated as in analoop, and any bit errors are counted to be displayed after the test using &t0. &t6 compute checksum for firmware-upgr adeable section of program memo ry. if no firmware upgrade is installed, &t6 returns 0x4474. &xn automatic determination of telephone line type. &x0 abort &x1 or &x2 command. table 12. extended at& command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 30 preliminary rev. 0.7 &x1 automatic determination of telephone line type. result code: wxyzn w: 0 = line supports dtmf dialing. 1 = line is pulse dial only. x: 0 = line supports 20 pps dialing. 1 = line supports 10 pps dialing only. y: 0 = extension network present (pbx). 1 = outside line (pstn) connected directly. z: 0 = continuous dialtone. 1 = make-break dialtone. n: 0?9 (number required for outside line if y = 0). note: the initial number attempted for an outside line is controlled in s51. &x2 same as &x1, but y result (pbx) is not tested. * y2a produce a constant answer tone (itu-t) and return to command mode. the answer tone continues until the ath command is received or the s7 timer expires. &z enter low-power wake-on-ring mode. table 13. extended at% command set (command defaults in bold) command action %$ display at% command settings. %b report blacklist. see also s42 register. %cn data compression %c0 disable v.42bis and mnp5 data compression %c1 enable v.42bis in transmit and receive paths. if mnp is selected (\n2), then %c1 enables mnp5 in transmit and receive paths. %c2 enable v.42bis in transmit path only. %c3 enable v.42bis in receive path only. %on answer mode. %o1 si2457/34/15/04 will auto-answer a call in answer mode. %o2 si2457/34/15/04 will auto-answer a call in originate mode. %vn automatic line status detection. after the %v1 and %v2 commands are issued, the si24 57/34/15/04 will auto matically check the telephone connection for whether or not a line is present. if a line is present, the si2457/34/15/04 will automatically check if the line is already in use. finally, the si 2457/34/15/04 will ch eck line status both before going off-hook and again before dialin g. %v1 uses the fixed method, and %v2 uses the adaptive method. %v0 (default) disables this feature. %v0 disable automatic line-in-use detection. table 12. extended at& command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 preliminary rev. 0.7 31 %v1 automatic line status detection?fixed method. description: before going off-hook with the atd, ato, or ata commands, the si2457/34/15/04 com- pares the line voltage (via lvcs) to registers noln (u83) and lius (u84): loop voltage action 0 lvcs noln report ?no line? and remain on-hook. noln lvcs lius report ?line in use? and remain on-hook. lius lcvs go off-hook and establish a modem connection. once the call has begun, the off-hook intrusion algo rithm (described in "4.1 2.2. off-hook intrusion detection" on page 18) operates normally. in add ition, the si2457/34/15/04 will repor t ?no line? if the telephone line is completely disconnected. if the hoi bit (u77, bit 11) is set, ?line in use? is reported upon intrusion. %v2 automatic line status detection?adaptive method. description: before going off-hook with the atd, ato, or ata commands, the si2457/34/15/04 com- pares the line voltage (via lvcs) to the nliu (u85) register: loop voltage action 0 lvcs (0.0625 x nliu) report ?no line? and remain on-hook. (0.0625 x nliu) < lvcs (0.85 x nliu) report ?line in use? and remain on-hook. (0.85 x nliu) < lcvs go off-hook and establish a modem connection. the nliu register is updated every 1 ms with the minimum non-zero value of lvcs in the last 30 ms. this allows the si2457/34/15/04 to eliminate errors due to 50/60 hz interference and also adapt to relatively slow change in the on-hook dc reference value on the telephone line. this algo- rithm does not allow any non-zero values for nliu below 0x0007. the host may also initialize nliu prior to issuing the %v2 command. once the call has begun, the off-hook intrusion algorithm (described in "4.12.2. off-hook intrusion detection" on page 18) operates normally. in addition, the si2457/34/15/04 will re port ?no line? if the tele phone line is completely disconnected. if the hoi (u77, bit 11) bit is set, ?line in use? is reported upon intrusion. table 13. extended at% command set (command defaults in bold) (continued) command action
si2457/34/15/04-si3008 32 preliminary rev. 0.7 table 14. extended at\ command set (command defaults in bold) command action \$ display at\ command settings. \bn character length will be au tomatically set in autobaud mode \b0 6n1?six data bits, no parity, one stop bit, one start bit, eight bits total (\n0 only) 1 \b1 7n1?seven data bits, no parit y, one stop bit, one start bit, nine bits total (\n0 only) 1 \b2 7p1?seven data bits, parity optioned by \p, one stop bit, one start bit, 10 bits total \b3 8n1?eight data bits, no parity, one stop bit, one start bit, 10 bits total \b5 8p1?eight data bits, parity optioned by \p, o ne stop bit, one start bit, 11 bits total (\n0 only) \b6 8x1?eight data bits, one escape bit, one stop bit, one start bit, 11 bits total (enables ninth-bit escape mode) \nn asynchronous protocol \n0 wire mode (no error correction, no compression) \n2 mnp reliable mode. the si2457/34/15/04 attemp ts to connect with the mnp protocol. if unsuccess- ful, the call is dropped. \n3 v.42 auto-reliable?the si2457/34/15/04 attempts to connect with the v.42 protocol. if unsuc- cessful, the mnp protocol is attempted. if unsuccessful, wire mode is attempted. \n4 v.42 (lapm) reliable mode (or drop call)?same as \n3 except that the si2457/34/15/04 drops the call instead of connecting in mnp or wire mode. \n5 v.42 and mnp reliable mode?the si2457/34/15/04 attempts to connect wit h v.42. if unsuccessful, mnp is attempted. if mnp us unsuccessful, the call is dropped. \pn parity type will be automati cally set in autobaud mode \p0 even \p1 space 1 \p2 odd \p3 mark 1 \qn modem-to-dte flow control \q0 disable all flow control?this ma y only be used if the dte speed and the vf speed are guaranteed to match throughout the call. \q2 use cts only notes: 1. when in autobaud mode, \b0, \b1, and \p1 will not be det ected automatically. the combin ation of \b2 and \p3 will be detected. this is compatible with seven data bits, no parity, two stop bits. seven data bits, no parity, one stop bit may be forced by sending at\t17\b1. 2. the autobaud feature does not detect this rate.
si2457/34/15/04-si3008 preliminary rev. 0.7 33 \q3 use rts/cts \q4 use xon/xoff flow control for modem-to-dte in terface. does not enable modem-to-modem flow control. \tn dte rate?change dte rate. when the si2457/34/ 15/04 is configured in autobaud mode (default), \t0 through \t15 will lock the new baud rate and disable autobaud. on the 24-pin version, the iso- modem? is not in autobaud mode (pin 18 low on powerup), the result code ?ok? is sent at the old dte rate. subsequent commands mu st be sent at the new rate. \t0 300 bps \t1 600 bps \t2 1200 bps \t3 2400 bps \t4 4800 bps \t5 7200 bps \t6 9600 bps \t7 12.0 kbps 2 \t8 14.4 kbps \t9 19.2 kbps \t10 38.4 kbps \t11 57.6 kbps \t12 115.2 kbps \t13 230.4 kbps \t14 245.760 kbps 2 \t15 307.200 kbps \t16 autobaud on 3 \t17 autobaud off; lock at current baud rate. \u serial mode?causes a low pulse (25 ms) on ri and dcd . int to be the inverse of esc. rts to be inverse of cts . parallel mode?causes a low pulse (25 ms) on int . this command terminates with a reset . table 14. extended at\ command set (command defaults in bold) (continued) command action notes: 1. when in autobaud mode, \b0, \b1, and \p1 will not be det ected automatically. the combin ation of \b2 and \p3 will be detected. this is compatible with seven data bits, no parity, two stop bits. seven data bits, no parity, one stop bit may be forced by sending at\t17\b1. 2. the autobaud feature does not detect this rate.
si2457/34/15/04-si3008 34 preliminary rev. 0.7 \vn connect message type \v0 report connect message and protocol message \v2 report connect message only (exclude protocol message) \v4 report connect and protocol message with both upstream and downstream connect rates. table 14. extended at\ command set (command defaults in bold) (continued) command action notes: 1. when in autobaud mode, \b0, \b1, and \p1 will not be det ected automatically. the combin ation of \b2 and \p3 will be detected. this is compatible with seven data bits, no parity, two stop bits. seven data bits, no parity, one stop bit may be forced by sending at\t17\b1. 2. the autobaud feature does not detect this rate.
si2457/34/15/04-si3008 preliminary rev. 0.7 35 table 15. result codes numeric meaning verbal response x0 x1 x2 x3 x4 x5 0command was successfulok xxxxxx 1 link established at 300 bps or higher connect xxxxxx 2incoming ring detected ring xxxxxx 3link dropped no carrier xxxxxx 4command failed error xxxxxx 5link establish at 1200 connect 1200 xxxxx 6 dial tone not present no dialtone x x x 7 line busy busy x x x 8remote not answering no answer xxxxxx 9 ringback detected ringing x 10link established at 2400connect 2400 xxxxx 11 link established at 4800 connect 4800 1 xxxxx 12 link established at 9600 connect 9600 1 xxxxx 14 link established at 19200 connect 19200 1 xxxxx 15 link established at 7200 connect 7200 1 xxxxx 16 link established at 12000 connect 12000 1 xxxxx 17 link established at 14400 connect 14400 1 xxxxx 18 link established at 16800 connect 16800 2 xxxxx 19 link established at 21600 connect 21600 2 xxxxx 20 link established at 24000 connect 24000 2 xxxxx 21 link established at 26400 connect 26400 2 xxxxx 22 link established at 28800 connect 28800 2 xxxxx 23 link established at 31200 connect 31200 2 xxxxx 24 link established at 33600 connect 33600 2 xxxxx 30caller id mark detected cidm xxxxxx 31hookswitch flash detectedflash xxxxxx notes: 1. this message is only supported on the si2457, si2434, and si2415. 2. this message is only supported on the si2457 and si2434. 3. x is the only verbal response code that does not follow the result code standard. there is no leading . 4. this message is only supported on the si2457.
si2457/34/15/04-si3008 36 preliminary rev. 0.7 32 uk cid state tone alert signal detected stas xxxxxx 33 overcurrent condition x 2 xxxxxx 40 blacklist is full blacklist full (enabled via s42 register) xxxxxx 41 attempted number is black- listed. blacklisted (enabled via s42 register) xxxxxx 42 no phone line present no line (enabled via %vn commands) xxxxxx 43 telephone line is in use line in use (enabled via %vn commands) xxxxxx 44 a polarity reversal was detected polarity reversal (enabled via g modifier) xxxxxx 45 a polarity reversal was not detected no polarity reversal (enabled via g modifier) xxxxxx 52 link established at 56000 connect 56000 4 xxxxx 60 link established at 32000 connect 32000 4 xxxxx 61 link established at 48000 connect 48000 4 xxxxx 63 link established at 28000 connect 28000 4 xxxxx 64 link established at 29333 connect 29333 4 xxxxx 65 link established at 30666 connect 30666 4 xxxxx 66 link established at 33333 connect 33333 4 xxxxx 67 link established at 34666 connect 34666 4 xxxxx 68 link established at 36000 connect 36000 4 xxxxx 69 link established at 37333 connect 37333 4 xxxxx 70 no protocol protocol: none set with \v0 command. 75link established at 75 connect 75 xxxxx 77 v.42 protocol protocol: v42 set with \v0 command. 79 v.42bis protocol protocol: v42bis set with \v0 command. 80 mnp2 protocol protocol: alternate, + class 2 set with \v command. table 15. result codes (continued) numeric meaning verbal response x0 x1 x2 x3 x4 x5 notes: 1. this message is only supported on the si2457, si2434, and si2415. 2. this message is only supported on the si2457 and si2434. 3. x is the only verbal response code that does not follow the result code standard. there is no leading . 4. this message is only supported on the si2457.
si2457/34/15/04-si3008 preliminary rev. 0.7 37 the connect messages shown in table 15 are sent when link negotiation is complete. 81 mnp3 protocol protocol: alternate, + class 3 set with \v command. 82 mnp4 protocol protocol: alternate, + class 4 set with \v command. 83 mnp5 protocol protocol: alternate, + class 5 xxxxx 90 link established at 38666 connect 38666 4 xxxxx 91 link established at 40000 connect 40000 4 xxxxx 92 link established at 41333 connect 41333 4 xxxxx 93 link established at 42666 connect 42666 4 xxxxx 94 link established at 44000 connect 44000 4 xxxxx 95 link established at 45333 connect 45333 4 xxxxx 96 link established at 46666 connect 46666 4 xxxxx 97 link established at 49333 connect 49333 4 xxxxx 98 link established at 50666 connect 50666 4 xxxxx 99 link established at 52000 connect 52000 4 xxxxx 100 link established at 53333 connect 53333 3 xxxxx 101 link established at 54666 connect 54666 3 xxxxx 102 dtmf dial attempted on a pulse dial only line un?obtainable numberxxxxxx table 15. result codes (continued) numeric meaning verbal response x0 x1 x2 x3 x4 x5 notes: 1. this message is only supported on the si2457, si2434, and si2415. 2. this message is only supported on the si2457 and si2434. 3. x is the only verbal response code that does not follow the result code standard. there is no leading . 4. this message is only supported on the si2457.
si2457/34/15/04-si3008 38 preliminary rev. 0.7 5. s-registers the s command allows reading (sn?) or writing (sn = x) the s-registers. the s-registers store values for functions that typically are rarely changed, such as timers or c ounters, and the ascii values of control characters, such as carriage return. table 16 su mmarizes the s-register set. table 16. s-register description definition s-register (decimal) function default (decimal) range units 0 automatic answer?number of rings the si2457/34/15/ 04 must detect before answering a call. 0 disables auto answer. 0 0?255 rings 1 ring counter. 0 0?255 rings 2 esc code character. 43 (+) 0?255 ascii 3 carriage return character. 13 (cr) 0?255 ascii 4 linefeed character. 10 (lf) 0?255 ascii 5 backspace character. 08 (bs) 0?255 ascii 6 dial tone wait timer?numb er of seconds the si2457/ 34/15/04 waits before blind dialing. only applicable if blind dialing is enabled (x0, x1, x3). 02 0?255 seconds 7 carrier wait timer?number of seconds the si2457/34/ 15/04 waits for carrier before timing out. this register also sets the number of seconds the modem waits for ringback when originating a call before hanging up. this register also sets the number of seconds the answer tone will continue while using the at * y2a command. 80 0?255 seconds 8 dial pause timer for , and < dial command modifiers. 02 0?255 seconds 9 carrier presence timer?time after a loss of carrier that a carrier must be detected before reactivating dcd . s9 is referred to as ?carrier loss debounce time.? 06 1?255 0.1 second 10 carrier loss timer?time the carrier must be lost before the si2457/34/15/04 disconnects. setting 255 disables disconnect entirely. if s10 is less than s9, even a momentary loss of ca rrier causes a disconnect. 14 1?255 0.1 second 12 escape code guard timer?minimum guard time required before and after ?+++? for the si2457/34/15/ 04 to recognize a valid escape sequence. 50 1?255 0.02 second 14 wait for dial tone delay value (in relation to the w dial modifier). starts when ?w? is executed in the dial string. 12 0?255 seconds
si2457/34/15/04-si3008 preliminary rev. 0.7 39 24 sleep inactivity time?set s the time that the modem operates in normal power mode with no activity on the serial port, parallel port, or telephone line before enter- ing low-power sleep mode. this feature is disabled if the timer is set to 0. 0 0?255 seconds 30 disconnect activity timer?sets the length of time that the modem stays online before disconnecting with no activity on the serial port , parallel port, or telephone line (ring, hookswitch flash, or caller id). this feature is disabled if set to 0. 0 0?255 minutes 38 hang up delay time?m aximum delay between receipt of ath0 command and hang up. if time out occurs before all data can be sent, the no carrier (3) result code is sent (operates in v.42 mode only). ?ok? response is sent if all data is transmitted before timeout. s38 = 255 disables timeout and modem dis- connects only if data is successfully sent or carrier is lost. 20 0?255 seconds 40 data pattern?data pattern generated during &t4 and &t5 transmit tests. 0 = all spaces (0s) 1 = all marks (1s) 2 = random data 00?2 41 v.34 symbol rate - symbol rate for v.34 when using the &t4 and &t5 commands. 0 = 2400 symbols/second 1 = 2743 symbols/second 2 = 2800 symbols/second 3 = 3000 symbols/second 4 = 3200 symbols/second 5 = 3429 symbols/second a valid combination of symbol rate (s41) and data rate (&g) must be selected. symbol rate allowable data rates 2400 2400?21600 2743 4800?26400 2800 4800?26400 3000 4800?28800 3200 4800?31200 3429 4800?33600 00?5 table 16. s-register description (continued) definition s-register (decimal) function default (decimal) range units
si2457/34/15/04-si3008 40 preliminary rev. 0.7 42 blacklisting?the si2457/34/15/04 will not dial the same number more than tw o times in three minutes. an attempt to dial a third time within three minutes will result in a ?blacklisted? result code. if the blacklist memory is full, any dial to a new number will result in a ?blacklist full? result code. numbers are added to the blacklist only if the modem connection fails. the %b command will list the numbers on the blacklists. 0 = disabled 1 = enabled 0 (disabled) 0?1 43 dial attempts to blacklist. when blacklisting is enabled with s42, this value con- trols the number of dial atte mpts that will result in a number being blacklisted. 40?4? 44 blacklist timer. period during which blacklisting is active. 180 0?255 seconds 50 minimum on-hook time?m odem will remain on-hook for s50 seconds. any atte mpt to go off-hook will be delayed until this timer expires. 3 0?255 seconds 51 number to start checking for an outside line on a pbx. see &x command for details. 10?9? table 16. s-register description (continued) definition s-register (decimal) function default (decimal) range units
si2457/34/15/04-si3008 preliminary rev. 0.7 41 6. user-access registers (u-registers) the :u at command is used to write these 16-bit u-registers, and the :r command is used to read them. u-registers are identified by a hexidecimal (hex) address. table 17. u-register description register name description default u00 dt1a0 dt1 registers set the coefficients for stage 1 of the dial tone detect filter. default is for fcc countries. see ?an 93: modem designer?s guide? for other country settings. 0x0800 u01 dt1b1 0x0000 u02 dt1b2 0x0000 u03 dt1a2 0x0000 u04 dt1a1 0x0000 u05 dt2a0 dial tone detect filters stage 2 biquad coefficients. 0x00a0 u06 dt2b1 0x6ef1 u07 dt2b2 0xc4f4 u08 dt2a2 0xc000 u09 dt2a1 0x0000 u0a dt3a0 dial tone detect filters stage 3 biquad coefficients. 0x00a0 u0b dt3b1 0x78b0 u0c dt3b2 0xc305 u0d dt3a2 0x4000 u0e dt3a1 0xb50a u0f dt4a0 dial tone detect filters stage 4 biquad coefficients. 0x0400 u10 dt4b1 0x70d2 u11 dt4b2 0xc830 u12 dt4a2 0x4000 u13 dt4a1 0x80e2 u14 dtk dial tone detect filter output scaler. 0x0009 u15 dton dial tone detect on threshold. 0x00a0 u16 dtof dial tone detect off threshold. 0x0070
si2457/34/15/04-si3008 42 preliminary rev. 0.7 u17 bt1a0 bt1 registers set the coefficients for stage 1 of the busy tone detect filter. default is for fcc countries. see ?an 93: modem designer?s guide? for other country settings. 0x0800 u18 bt1b1 0x0000 u19 bt1b2 0x0000 u1a bt1a2 0x0000 u1b bt1a1 0x0000 u1c bt2a0 busy tone detect filter stage 2 biquad coefficients. 0x00a0 u1d bt2b1 0x6ef1 u1e bt2b2 0xc4f4 u1f bt2a2 0xc000 u20 bt2a1 0x0000 u21 bt3a0 busy tone detect filter stage 3 biquad coefficients. 0x00a0 u22 bt3b1 0x78b0 u23 bt3b2 0xc305 u24 bt3a2 0x4000 u25 bt3a1 0xb50a u26 bt4a0 busy tone detect filter stage 4 biquad coefficients. 0x0400 u27 bt4b1 0x70d2 u28 bt4b2 0xc830 u29 bt4a2 0x4000 u2a bt4a1 0x80e2 u2b btk busy tone detect filter output scaler. 0x0009 u2c bton busy tone detect on threshold. 0x00a0 u2d btof busy tone detect off threshold. 0x0070 u2e bmtt busy cadence minimum total time in seconds multiplied by 7200. see ?an93: modem designer?s guide? for details. 0x0870 u2f bdlt busy cadence delta in se conds multiplied by 7200. 0x25f8 u30 bmot busy cadence minimum on time in seconds multiplied by 7200. 0x0438 u31 rmtt ringback cadence minimum total time in seconds multiplied by 7200. 0x4650 u32 rdlt ringback cadence delta in seconds multiplied by 7200. 0xef10 table 17. u-register description (continued) register name description default
si2457/34/15/04-si3008 preliminary rev. 0.7 43 u33 rmot ringback cadence minimum on time in seconds multiplied by 7200. 0x1200 u34 dtwd window to look fo r dialtone in seconds mu ltiplied by 1000. 0x1b58 u35 dmot minimum dialtone on time in seconds multiplied by 7200. 0x2d00 u37 pd0 number of pulses to dial 0. 0x000a u38 pd1 number of pulses to dial 1. 0x0001 u39 pd2 number of pulses to dial 2. 0x0002 u3a pd3 number of pulses to dial 3. 0x0003 u3b pd4 number of pulses to dial 4. 0x0004 u3c pd5 number of pulses to dial 5. 0x0005 u3d pd6 number of pulses to dial 6. 0x0006 u3e pd7 number of pulses to dial 7. 0x0007 u3f pd8 number of pulses to dial 8. 0x0008 u40 pd9 number of pulses to dial 9. 0x0009 u42 pdbt pulse dial break time (ms units). 0x003d u43 pdmt pulse dial make time (ms units). 0x0027 u45 pdit pulse dial interdigit time (ms units). 0x0320 u46 dtpl dtmf power level?16-bit form at is 0x0(h)(l)0 where h is the (?)dbm level of the high-frequency dtmf tone and l is the (?)dbm level of the low-frequency dtmf tone. note that twist may be specified here. 0x09b0 u47 dtnt dtmf on time (ms units). 0x0064 u48 dtft dtmf off time (ms units). 0x0064 u49 rgfh ring frequency high?maximum frequency ring to be considered a valid ring. rgfh = 2400/(maximum ring frequency). 0x0022 u4a rgfd ring delta 0x007a u4b rgmn ring cadence minimum on time in seconds multiplied by 2400. 0x0258 u4c rgnx ring cadence maximum total time in seconds multiplied by 2400. 0x6720 u4d mod1 this is a bit-mapped register. 0x0000 u4e prdd pre-dial delay-time after atd command that modem waits to dial (ms units). the si2457/34/15/04 stays on-hook during this time. 0x0000 table 17. u-register description (continued) register name description default rgfd 2400 hz 1 min ring freq (hz) ---------------------------------------------- - ?? ?? 1 max ring freq (hz) ----------------------------------------------- - ?? ?? ? =
si2457/34/15/04-si3008 44 preliminary rev. 0.7 u4f fht flash hook time. time corresponding with ?!? or ?&? dial modifier that the si2457/34/15/04 goes on-hook during a flash hook (ms units). 0x01f4 u50 lcdn loop current debounce on time (ms units). 0x015e u51 lcdf loop current debounce off time (ms units). 0x00c8 u52 xmtl transmit level (1 db units)?sets the modem data pump transmitter level. default level of 0 corr esponds to ?9.85 dbm. transmit level = ?(9.85 + xmtl) dbm. range = ?9.85 to ?48. 0x0000 u53 mod2 this is a bit-mapped register. 0x0000 u62 daac1 this is a bit-mapped register. 0x0804 u63 daac3 this is a bit-mapped register. 0x0003 u65 daac4 this is a bit-mapped register. 0x00e0 u66 daac5 this is a bit-mapped register. 0xxx40 u67 itc1 this is a bit-mapped register. 0x0008 u68 itc2 this is a bit-mapped register. 0x0000 u6c lvs this is a bit-mapped register. 0xxx00 u6e ck1 this is a bit-mapped register. 0xxf20 u6f ptmr this is a bit-mapped register. 0x00ff u70 io0 this is a bit-mapped register. 0x2700 u71 io1 this is a bit-mapped register. 0x0000 u76 gen1 this is a bit-mapped register. 0x3240 u77 gen2 this is a bit-mapped register. 0x401e u78 gen3 this is a bit-mapped register. 0x0000 u79 gen4 this is a bit-mapped register. 0x00xx u7a gena this is a bit-mapped register. 0x0000 u83 noln no-line threshold. if %v1 is set, no ln sets the threshold for determination of line present vs. line not present. 0x0001 u84 lius line-in-use threshold. if %v1 is set, lius sets the threshold for determination of line in use vs. line not in use. 0x0007 u85 nliu line-in-use/no line threshold. if %v2 is set, nliu sets the threshold reference for the adaptive algorithm (see %v2). 0x0000 u86 v9agg v.90 rate adjustment fo r japan (1333 bps units). 0x0000 u87 sam this is a bit-mapped register 0x0000 table 17. u-register description (continued) register name description default
si2457/34/15/04-si3008 preliminary rev. 0.7 45 u9f sasf sas frequency de tection. see ?an93: modem desi gner?s guide? for complete details. 0x0000 ua0 sc0 sas cadence 0. sets the duration of the first sas tone (ms). 0x001e ua1 sc1 sas cadence 1. sets the duration of the first sas silence (ms). 0x0000 ua2 sc2 sas cadence 2. sets the duratio n of the second sas tone (ms). 0x0000 ua3 sc3 sas cadence 3. sets the duratio n of the second sas silence (ms). 0x0000 ua4 sc4 sas cadence 4. sets the durat ion of the third sas tone (ms). 0x0000 ua5 sc5 sas cadence 5. sets the duratio n of the third sas s ilence (ms). 0x0000 ua6 sc6 sas cadence 6. sets the duratio n of the fourth sas tone (ms). 0x0000 ua7 sc7 sas cadence 7. sets the duration of the fourth sas s ilence (ms). 0x0000 ua8 sc8 sas cadence 8. sets the duratio n of the fifth sas tone (ms). 0x0000 ua9 sc9 sas cadence 9. sets the duratio n of the fifth sas silence (ms). 0x0000 uaa v29mode this is a bit mapped register. 0x0000 table 17. u-register description (continued) register name description default
si2457/34/15/04-si3008 46 preliminary rev. 0.7 table 18. bit-mapped u-register summary reg. name bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 u4d mod1 toct nhfp nhfd clpd ftp spdm gt18 gt55 cte u53 mod2 rev u62 daac1 foh dl u63 daac3 lcs[7:0] u65 daac4 pwmg pdn pdl u66 daac5 fdt u67 itc1 rt u68 itc2 rov u6c lvs lvs[7:0] u6e ck1 r1[4:0] u6f ptme ptmr[7:0] u70 io0 hes tes cidm ocdm ppdm rim dcdm cid ocd ppd ri dcd u71 io1 comp prt u76 gen1 ohsr[7:0] facl dcl[2:0] acl[4:0] u77 gen2 ist[3:0] hoi aoc oht[8:0] u78 gen3 ib[1:0] is[7:0] u79 gen4 lvcs[4:0] u7a gena dop add v22hd hdlc fast u7c genc rigpo rig- poen u7d gend nlm atzd fdp u87 sam mint serm fsms xmtt uaa v29mode v29ena
si2457/34/15/04-si3008 preliminary rev. 0.7 47 6.1. bit-mapped u-register detail (defaults in bold) reset settings = 0x0000 u4d mod1 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name toct nhfp nhfd clpd ftp spdm gt18 gt55 cte type r/w r/w r/w r/w r/w r/w r/w r/w r/w bit name function 15 reserved read returns zero. 14 toct turn off calling tone. 0=disable. 1 = enable. 13 reserved read returns zero. 12 nhfp no hook flash pulse. 0=disable. 1 = enable. 11 nhfd no hook flash dial. 0=disable. 1 = enable. 10 clpd check loop current before dialing. 0 = ignore. 1=check. 9 reserved read returns zero. 8ftp force tone or pulse. 0=disable. 1 = enable. 7spdm skip pulse dial modifier. 0=no. 1=yes. 6 reserved read returns zero. 5gt18 1800 hz guard tone enable. 0=disable. 1 = enable. 4gt55 550 hz guard tone enable. 0=disable. 1 = enable. 3cte calling tone enable. 0=disable. 1 = enable. 2:0 reserved read returns zero.
si2457/34/15/04-si3008 48 preliminary rev. 0.7 reset settings = 0x0000 reset settings = 0x0804 u53 mod2 bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name rev type r/w bit name function 15 rev v.23 reversing. 0 = disable. 1=enable. 14:0 reserved read returns zero. u62 daac1 bit d15d14d13d12d11d10d9 d8 d7d6d5d4d3d2d1d0 name foh dl type r/w r/w bit name function 15:12 reserved must be set to 0. 11 reserved must be set to 1. 10:3 reserved must be set to 0. 2foh fast off-hook. 0 = automatic calibration time set to 426 ms. 1 = automatic calibration time set to 106 ms. 1dl isolation digital loopback (see the at&t commands). 0 = loopback occurs be yond the daa interface, out to an d including the analog hybrid circuit. 1 = enables digital loopback mode across isolation barrier only. clear after loopback test is terminated. 0 reserved must be set to 0.
si2457/34/15/04-si3008 preliminary rev. 0.7 49 reset settings = 0xxx03 reset settings = 0x00e0 u63 daac3 bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name lcs[7:0] type r bit name function 15:8 lcs[7:0] off-hook loop current (1.1 ma/bit). 7:0 reserved read returns 0x3. u65 daac4 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name pwmg pdn pdl type r/w r/w r/w bit name function 15 reserved read returns zero. 14 pwmg pwm gain. 0=no gain. 1 = 6 db gain applied to aout. 13 pdn powerdown. completely powerdown the si2457/34/15/04 and si3008. once set to 1, the si2457/34/15/04 must be reset to power on. 0 = normal. 1 = powerdown. 12:8 reserved read returns zero. 7:5 reserved must not change in a read-modify-write. 4pdl* powerdown line-side chip. 0 = normal operation. 1 = places the si3008 in powerdown mode. 3:0 reserved must not change in a read-modify-write. *note: typically used only for board-level debug.
si2457/34/15/04-si3008 50 preliminary rev. 0.7 reset settings = 0x0040 u66 daac5 bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name fdt type r bit name function 15:7 reserved read returns zero. 6fdt* frame detect. 0 = indicates isomodem has not established frame lock. 1 = indicates isomodem frame lock has been established. 5:4 reserved read returns zero. 3:0 reserved do not modify. *note: typically used only for board-level debug.
si2457/34/15/04-si3008 preliminary rev. 0.7 51 reset settings = 0x0008 reset settings = 0x0000 u67 itc1 bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name rt type r/w bit name function 15:1 reserved read returns zero. 0rt ringer threshold select. used to satisfy country requirements on ring detection. signals below the lower level does not generate a ring detection; signals above the up per level are guaranteed to generate a ring detection. 0 = 11 to 22 v rms . 1 = 17 to 33 v rms . u68 itc2 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name rov type r/w bit name function 15:2 reserved do not modify. 1rov receive overload. the bit is set when the receive input (i.e., receive pin goes below ground) has an excessive input level. this bit is cleared by writing a 0 to this location. 0 = normal receive input level. 1 = excessive receive input level. 0 reserved read returns zero.
si2457/34/15/04-si3008 52 preliminary rev. 0.7 reset settings = 0xxx00 u6c lvs bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name lvs[7:0] type r bit name function 15:8 lvs[7:0] line voltage status. eight bit signed, twos complement number repr esenting the tip-ring voltage. each bit repre- sents 1.19 v. polarity of the voltage is represented by the msb (sign bit). 0000_0000 = measured voltage is < 3 v. 7:0 reserved read returns zero.
si2457/34/15/04-si3008 preliminary rev. 0.7 53 reset settings = 0x1f20 reset settings = 0x00ff u6e ck1 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name r1[4:0] type r/w bit name function 15:13 reserved do not modify. 12:8 r1[4:0] r1 clkout divider. see ?an93: modem designer?s guide? for details. 7:0 reserved read returns zero. u6f ptmr bitd15d14d13d12d11d10d9d8d7d6d5d4d3 d2 d1d0 name ptmr[7:0] type r/w bit name function 15:8 reserved do not modify 7:0 ptmr[7:0] parallel port receive fifo interrupt timer. see ?an93: modem designer?s guide? for details.
si2457/34/15/04-si3008 54 preliminary rev. 0.7 reset settings = 0x2700 u70 io0 bit d15d14d13d12d11d10d9 d8 d7 d6 d5d4d3d2d1d0 name hes tes cidm ocdm ppdm rim dcdm 0 cid ocd ppd ri dcd type r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w bit name function 15 hes hardware escape pin. 0 = disable. 1 = enable. 14 reserved read returns zero. 13 tes enable ?+++? escape. 0=disable. 1=enable. 12 cidm caller id mask. 0 = change in cid will not affect int. 1 = a low to high transition in cid activates int . 11 ocdm overcurrent detect mask. 0 = change in ocd does not affect int. (?x? result code is not generated in command mode.) 1 = a low to high transition in o cd will activate int. (?x? result code is generat ed in command mode.) 10 ppdm parallel phone detect mask. 0 = change in ppd does not affect int . 1 = a low to high transition in ppd will activate int. 9rim ring indicator. 0 = change in ri does not affect int . 1 = a low to high transition in ri activates int. 8dcdm data carrier detect mask. 0 = change in dcd does not affect int . 1 = a high to low transition in dcd (u70, bit 0), which indicates loss of carrier, activates int. 7 reserved must be set to zero. 6:5 reserved read returns zero. 4cid caller id (sticky). caller id preamble has been detected; data will soon fo llow. clears on :i read. 3ocd overcurrent detect (sticky). overcurrent condition has occurred. clears on :i read. 2 ppd parallel phone detect (sticky). parallel phone detected since last off-hook event. clears on :i read. 1ri ring indicator. active high bit when the si2457/34/15/04 is on- hook, indicates ring event has occurred. clears on :i read. 0dcd data carrier detect (status). active high bit indicates carrier detected (equivalent to inverse of dcd pin).
si2457/34/15/04-si3008 preliminary rev. 0.7 55 reset settings = 0x0000 reset settings = 0x3240 u71 io1 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name comp prt type r/w r/w bit name function 15:5 reserved read returns zero. 4comp 0 = disables compression (pcm mode). 1 = enables linear compression. 3:1 reserved read returns zero. 0prt 0 = disables pcm mode. 1 = enables pcm mode. u76 gen1 bit d15d14d13d12d11d10d9 d8 d7d6d5d4d3d2d1d0 name ohsr[6:0] facl dcl[2:0] acl[4:0] type r/w r/w r/w bit name function 15:9 ohsr[6:0] off-hook sample rate (40 ms units). sets the sample rate for the off-hook intrusion algorithms (1 second default). 8facl force acl. 0 = while off-hook, acl is automatically updated with lvcs. 1 = while off-hook, acl does not change from the value written to it while on-hook. 7:5 dcl[2:0] differential current level (3 ma units). sets the differential level betw een acl and lvcs that will trig ger an off-hook ppd interrupt (default = 2). 4:0 acl[4:0] absolute current level (3 ma units). acl represents the value of lvcs current when the isomodem? is off-hook and all parallel phones are on-hook. if acl = 0, it is ignored by the off-hook intrusion algorithm.the isomo- dem will also write acl with the contents of lvcs before an intrusion and before going on- hook (default = 0).
si2457/34/15/04-si3008 56 preliminary rev. 0.7 reset settings = 0x401e u77 gen2 bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2d1d0 name ist[3:0] hoi aoc oht[8:0] type r/w r/w r/w r/w bit name function 15:12 ist[3:0] intrusion settling time (250 ms units). delay between when the isomodem goes off-hook and the off-hook intrusion algorithm begins. default is 1 s. 11 hoi hang-up on intrusion. 0 = isomodem will not automatically hang up when an off-hook ppd interrupt occurs. 1 = isomodem automatically hangs up on a ppd interrupt. if %vn commands are set, hoi also causes the ?line in use? result code upon ppd interrupt. 10 reserved read returns zero. 9aoc auto overcurrent. 0 = disable. 1 = enable. note: aoc may falsely detect an overcurrent condition in the presence of line reversals or other transients. therefore, this feature should not be used in applications or locations (such as japan) where line reversals are common or may be expected. 8:0 oht[8:0] off-hook time (1 ms units). time before lvcs is checked for overcurrent condition after going off-hook (30 ms default).
si2457/34/15/04-si3008 preliminary rev. 0.7 57 reset settings = 0x0000 u78 gen3 bitd15d14d13d12d11d10d9 d8d7d6d5d4d3d2d1d0 name ib[1:0] is[7:0] type r/w r/w bit name function 15:14 ib[1:0] intrusion blocking. defines the method used to block the off-hook intrusion algorithm from operation after dialing has begun. 0 = no intrusion blocking. 1 = intrusion disabled from start of dial to end of dial. 2 = intrusion disabled from start of dial to is register time-out. 3 = intrusion disabled from start of dial to connect (?connect xxx? , ?no dialtone?, or ?no carrier?). 13:8 reserved read returns zero. 7:0 is[7:0] intrusion suspend (500 ms units). when ib = 2, this register sets the length of ti me from when dialing begins that the off-hook intrusion algorithm is blocked (suspended) (default = 00000000 b ).
si2457/34/15/04-si3008 58 preliminary rev. 0.7 reset settings = 0x00xx u79 gen4 bit d15d14d13d12d11d10d9 d8 d7d6d5d4d3d2d1d0 name lvcs[4:0] type r bit name function 15:5 reserved read returns zero. 4:0 lvcs[4:0] line voltage current sense. represents either the line voltage, loop current, or on-hook line monitor. on-hook voltage monitor (2.75 v/bit 20%). 00000 = no line connected. 00001 = minimum line voltage (v min =3.0v 0.5v). 11111 = maximum line voltage (87 v 20%). the line voltage monitor full scale may be modified by changing r5 as follows: v max =v min + 4.2 (10m + r5 + 1.6k)/(r5 +1.6k)/5 off-hook loop current monitor (3 ma/bit). 00000 = no loop current. 00001 = minimum loop current. 11110 = maximum loop current. 11111 = loop current is excessive (overload). overload > 140 ma in all modes except tbr21 overload > 54 ma in tbr21 mode lvcs is backward compatible with si2456/33/14 isomodems. the lvcs value is absolute and does not reflect loop polarity. see u6c (lvs )[15:8] for 1 v/bit resolution and signed twos complement output
si2457/34/15/04-si3008 preliminary rev. 0.7 59 reset settings = 0x0000 u7a gena bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name dop add v22hd hdlc fast type r/w r/w r/w r/w r/w bit name function 15:8 reserved read returns to zero. 7dop dial or pulse. 0 = normal atdtw operation 1 = use atdtw for pulse/tone dial de tection (see also atdw command) 6add adaptive dialing 1 = enable 0=disable attempt dtmf dial, then fall back to pulse dialin g if unsuccessful. first digit is dialed as dtmf. if a dialtone is still present after two se conds, the si24 57/34/15/04 will redial the first digit and remaining digits as pulse. if a dial tone is not present after two seconds, the si2457/34/15/04 will dial the remaining digits as dtmf. 5:3 reserved read returns to zero. 2 v22hd v.22bis synchronous mode.* 0 = normal asynchronous mode. 1 = transparent hdlc mode. 1hdlc synchronous mode.* 0 = normal asynchronous mode. 1 = transparent hdlc mode. 0 fast fast connect.* 0 = normal modem handshake timing per itu/bellco re standards. 1 = fast connect modem handshake timing. *note: when v22hd, hdlc, or fast bits are set, \n0 (wire mode) must be used.
si2457/34/15/04-si3008 60 preliminary rev. 0.7 reset settings = 0x0000 reset settings = 0x0000 u7c genc bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name rigpo rigpoen type rr/w bit name function 15:5 reserved reads returns to zero. 4rigpo ri ri (pin 17), follows this bit when rigpioen = 1 b . 3:1 reserved reads returns to zero. 0 rigpoen 0=ri indicates valid ring signal. (normal ring-indicator mode) 1=ri (pin 17) can be used as a general pu rpose output and follo ws u7c[4] (rigpo). u7d gend bit d15d14d13d12d11d10d9d8d7d6d5d4d3d2 d1 d0 name nlm atzd fdp type r/w r/w r/w bit name function 15 reserved reads returns to zero. 14 nlm 0 = enables ?no loop current? detect. 1 = disables ?no loop current? detect. 13:2 reserved reads returns to zero. 1 atzd atz disable. 0 = atz functions normally. 1 = disable atz command. 0fdp fsk data processing. 0 = fsk data processing stops when carrier is lost. 1 = fsk data processing continued for 2 bytes after carrier is lost.
si2457/34/15/04-si3008 preliminary rev. 0.7 61 reset settings = 0x0000 reset settings = 0x0000 u87 sam bit d15d14d13d12d11d10 d9 d8 d7d6d5d4d3d2 d1 d0 name mint serm fsms xmtt[7:0] type r/w r/w r/w r/w bit name function 15:11 reserved reads returns to zero. 10 mint minimal transparency 0 = generates two-byte transparency sequences. this option will use codes through , if possible, for received data containing two back-to-back bytes requiring transparency. 1 = generates one-byte transparency se quences. this option will only use codes through for received data. 9 serm special error reporting mode 0 = ignore unrecognized in-band commands. 1 = generate <0x45> (?e? for error) in response to any unrecognized in-band com- mands. 8fsms framed sub-mode startup 0 = upon successful connection, enter transport sub-mode. an is required to enter framed sub-mode. 1 = upon successful connection, immediately enter framed sub-mode. the first received from a successful hunt is transfor med into an . 7:0 xmtt[7:0] transmitter threshold this value represents the number of bytes before a transmission is started. the following values are special: 0 the same as ten. upon receipt of ten bytes, data is transferred. the dte must supply a closing flag within the require d time or an underrun will occur. 255 the same as infinity, e.g. never start a packet until the closing flag is received. uaa v.29 mode bitd15d14d13d12d11d10d9d8d7d6d5d4d3d2 d1 d0 name v29ena type r/w bit name function 15:2 reserved reads returns to zero. 1v29ena 0 = disables v.29. 1 = enables v.29. 0 reserved read returns zero.
si2457/34/15/04-si3008 62 preliminary rev. 0.7 7. parallel interface registers reset settings = 0x00 parallel interface 0 (0x00) bitd7d6d5d4d3d2d1d0 name tx/rx[7:0] type r/w bit name function 7:0 tx/rx[7:0] parallel interface transmit/receive. this register functions similarly to the serial po rt tx pin on writes to the parallel port, and sim- ilarly to the serial port rx pin on reads from the parallel port.
si2457/34/15/04-si3008 preliminary rev. 0.7 63 reset settings = 0110_0011 parallel interface 1 (0x01) bitd7d6d5 d4 d3 d2d1d0 name rxf txe rem intm int esc rts cts type r r r r/w r r/w r/w r bit name function 7rxf receive fifo almost full (status). 0 = receive fifo (12 deep) contains three or more empty locations (rxf 9). the host can clear the rxf interrupt without em ptying the rx fifo by writing a 0 to the rxf bit. this will disable the rxf interrupt until the host has emptied the fifo. 1 = receive fifo contains two or less empty locations (rxf 10). 6txe transmit fifo almost empty (status). 0 = transmit fifo (14 deep) contains three or more characters (txf 3). 1 = transmit fifo contains two or less characters (txf 2). note: txe interrupt will not trigger if the cts bit is inac tive. therefore, the host does not need to poll cts while waiting for transmit fifo to empty. txe can be cleared by writing it to 0. 5rem receive fifo empty. 0 = receive fifo has valid data. 1 = receive fifo empty. note: if the interim timer (see ptmr - u6f, bits 7:0) se t by ptmr expires, it will cause an interrupt. this interrupt will not set rxf, txe, or int. the inte rrupt handler on the host should then verify that rem = 0 and begin to empty the receive fifo (parallel interface 0 register) until rem = 1. 4intm interrupt mask. 0 = in parallel mode, the int pin is triggered by a rising edge on rxf or txe only (default). 1 = in parallel mode, the int pin is triggered by a rising edge on rxf, txe, or int. 3int interrupt. 0 = no interrupt has occurred. 1 = indicates that an interrupt (cid, ocd, ppd, ri, or dcd from u70) has occurred. this bit is cleared via the at:i command. 2 esc escape. operation of this bit in parallel mode is functionally equivalent to the esc pin in serial mode. 1rts request-to-send. operation of this bit in parallel mode is functionally equivalent to the rts pin in serial mode. use of the cts and rts bits (as opposed to the txe and rxf bits) allows the flow control between the host and the isomodem? to operate 1 byte at a time, rather than in blocks. 0cts clear-to-send. operation of this bit in parallel mode is functionally equivalent to the cts pin in serial mode. use of the cts and rts bits (as opposed to the txe and rxf bits) allows the flow control between the host and the isomo dem to operate 1 byte at a time, rather than in blocks.
si2457/34/15/04-si3008 64 preliminary rev. 0.7 8. pin descriptions: si24 57/34/15/04 (16-pin option) pin # pin name description 1 clkin/xtali xtali?crystal oscillator pin. provides support for parallel resonant at cut crystals. a 4.9152 mhz crystal or a 4.9152 or 27 mhz clock on xtali is required. 2xtalo xtalo?crystal oscillator pin. serves as the output of the crystal amplifier. 3ri ring indicator. the ri on (active low) indicates the presence of an on segment of a ring signal on the tele- phone line. 4v d supply voltage. provides the 3.3 v supply voltage to the si2457/34/15/04. 5rxd receive data. data output to dte rxd pin. 6txd transmit data. data input from dte txd pin. 7cts clear to send. signals that the si2457/34/15/ 04 is ready to receive more digital data on the txd pin. 8 reset reset input. an active low input that is used to reset all control registers to a defined, initialized state. 9c2a isolation capacitor 2a. connects to one side of the isolation capacitor c2. 10 c1a isolation capacitor 1a. connects to one side of the isolation capacitor c1. 11 int interrupt output. active low interrupt output. 12 gnd ground. connects to the system digital ground. 13 v a regulator voltage reference. connects to an external capacitor and serves as the reference for the internal voltage regulator. 14 esc escape. a positive edge on this pin causes the modem to go from online (connected) mode to the offline (command) mode. 15 dcd carrier detect. active low carrier detect. 16 rts request to send. active low request to send input used for flow control. clkin/xtali 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 xtalo ri v d rxd txd cts reset c2a c1a int gnd v a esc dcd rts 1 si2457/34/15/04
si2457/34/15/04-si3008 preliminary rev. 0.7 65 9. pin descriptions: si24 57/34/15/04 (24-pin option) pin # pin name description 1 clkin/xtali clock input/crystal oscillator pin. provides support for parallel resonant at cut crystals. a 4.9152 mhz crystal or a 4.9152 or 27 mhz clock on xtali is required. 2x t a l o crystal oscillator pin. serves as the output of the crystal amplifier. 3 clkout/eecs /a0 clock output/eeprom chip select/addr ess bit 0. clock output in serial mo de. active low read/write enable for spi eeprom in serial mode when pin 4 is pulled low during powerup. address enable in parallel mode. 4 fsync /d6 frame sync/data bit. frame sync output to codec in serial mode . bidirectional parallel bus data bit 6 in parallel mode. 5, 21 vd3.3 digital supply voltage. provides the 3.3 v supply vo ltage to the si2457/34/15/04. 6, 20 gnd ground. connects to the system digital ground. 7,19 vda, vdb regulator voltage reference. connects to an external capacitor and serves as the reference for the internal voltage regulator. 8rts /d7 request to send/data bit. active low request to send input used for fl ow control in serial mode. bidirectional parallel bus data bit 7 in parallel mode. 9rxd/rd receive data/read enable. data output to dte rxd pin in serial mo de. active low read enable pin in parallel mode. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 si2457/34/15/04 clkin/xtali xtalo clkout/eecs/a0 fsync/d6 vd3.3 gnd vda rts/d7 rxd/rd txd/wr cts/cs reset aout/int ri/d1 sdi/eesd/d2 vdb vd3.3 esc/d3 dcd/d4 gnd sdo/eeclk/d5 int/do c1a c2a
si2457/34/15/04-si3008 66 preliminary rev. 0.7 10 txd/wr transmit data/write enable. data input from dte txd pin in serial mo de. active low write enable pin in paral- lel mode. 11 cts /cs clear to send/chip select. signals that the si2457/34/ 15/04 is ready to receive morre digital data on the txd pin in data mode. active lo w chip select in parallel mode. 12 reset reset input. an active low input that is used to reset all control regi sters to a defined initialized state. 13 c2a isolation capacitor 2a. connects to one side of the isolation capacitor, c2. 14 c1a isolation capacitor 1a. connects to one side of the isolation capacitor, c1. 15 aout/int analog output/interrupt output. analog output in serial mode. active low interrupt output in parallel mode. 16 int /d0 interrupt output/data bit. active low interrupt output in serial mode. bidirectional parallel bus data bit 0 in parallel mode. 17 ri /d1 ring indicator/data bit. the ri on (active low) indicates the presence of an on segment of a ring signal on the telephone line. bidirectional parallel bus data bit 1 in parallel mode. 18 sdi/eesd/d2 serial data in/eeprom serial data input/output/data bit. serial data in (to codec) ou tput in serial mode. bidirectional input/output to spi eeprom in serial mode when pin 4 is pulled low during powe r up. bidirectional parallel bus data bit 2 in parallel mode. 22 esc/d3 escape/data bit. hardware escape in serial mode. bidirect ional parallel bus data bit 3 in parallel mode. 23 dcd /d4 carrier detect/data bit. active low carrier detect in serial mode. bidirectional parallel bus data bit 4 in par- allel mode. 24 sdo/eeclk/d5 serial data out/eeprom clock/data bit 5. serial data out (from codec) input in serial mode. clock output for spi eeprom in serial mode when pin 4 is pulled low during power up. bidirectional parallel bus data bit 5 in parallel mode. pin # pin name description
si2457/34/15/04-si3008 preliminary rev. 0.7 67 10. pin descriptions: si3008 pin # pin name description 1c1b isolation capacitor 1b. connects to one side of isolation capa citor c1 and communicates with the si2457/ 34/15. 2c2b isolation capacitor 2b. connects to one side of isolation capa citor c2 and communicates with the si2457/ 34/15. 3vreg voltage regulator. connects to an external capacitor to provide bypassing for an internal power supply. 4cid caller id. caller id input. 5qe transistor emitter. connects to the emitter of q3. 6qb transistor base. connects to the base of transistor q3. used to go on- and off-hook. 7 dct dc termination. provides dc termination to the telephone network. 8rx receive input. serves as the receive side input from the telephone network. 9ignd isolated ground. (exposed pad) connects to ground on the line-side interface. ignd c1b c2b cid rx dct qb 8 1 7 2 6 3 5 4 si3008 qe 9 vreg
si2457/34/15/04-si3008 68 preliminary rev. 0.7 11. ordering guide chipset max speed digital package digital line temp. range si2457 56 kbps tssop-24 si2457-x-ft si3008-x-fs 0 to 70 c si2457 56 kbps soic-16 si2457-x-fs si3008-x-fs 0 to 70 c si2434 33.6 kbps tssop-24 si2434-x-ft si3008-x-fs 0 to 70 c si2434 33.6 kbps soic-16 si2434-x-fs si3008-x-fs 0 to 70 c si2415 14.4 kbps tssop-24 si2415-x-ft si3008-x-fs 0 to 70 c si2415 14.4 kbps soic-16 si2415-x-fs si3008-x-fs 0 to 70 c si2404 2400 bps tssop-24 si2404-x-ft si3008-x-fs 0 to 70 c si2404 2400 bps soic-16 si2404-x-fs si3008-x-fs 0 to 70 c notes: 1. add an ?r? at the end of the device to denote tape and reel option; 2500 quantity per reel. 2. ?x? denotes product revision.
si2457/34/15/04-si3008 preliminary rev. 0.7 69 12. package outline: 24-pin tssop figure 9 illustrates the package details for the si2457/34/15/ 04 24-pin packaging option. table 19 lists the values for the dimensions shown in the illustration. figure 9. 24-pin thin shrink small outline package (tssop) table 19. package diagram dimensions symbol millimeters min max a ? 1.20 a1 0.05 0.15 b 0.19 0.30 c 0.09 0.20 d 7.70 7.90 e 6.40 bsc e 1 4.30 4.50 e 0.65 bsc l 0.45 0.75 0 8 0.10 bbb 0.10 ddd 0.20 e b d l c a a1 a b ddd c h a e b c a b c bbb (2x) approximate device weight is 96 mg.
si2457/34/15/04-si3008 70 preliminary rev. 0.7 13. package outline: 16-pin soic figure 10 illustrates the package details for the si3008 and the si2457/34/15/04 16-pin packaging option. table 20 lists the values for the dimens ions shown in the illustration. figure 10. 16-pin small outline integrated circuit (soic) package table 20. package diagram dimensions symbol millimeters min max a 1.35 1.75 a1 .10 .25 b.33.51 c.19.25 d 9.80 10.00 e 3.80 4.00 e 1.27 bsc h 5.80 6.20 h.25.50 l .40 1.27 0.10 0o 8o aaa 0.25 bbb 0.25 e h a1 b c h l e see detail f detail f a 16 9 8 1 d seating plane -b- b bbb -a- b a c aaa -c- approximate device weight is152 mg.
si2457/34/15/04-si3008 preliminary rev. 0.7 71 14. package outline: 8-pi n exposed pad soic (si3008) figure 11 illustrates the package details for the si3008. table 21 lists the val ues for the dimensions shown in the illustration. figure 11. 8-pin exposed pad small outline integrated circuit (soic) package table 21. package diagram dimensions symbol millimeters min max a 1.35 1.75 a1 0.00 0.15 a2 1.40 1.55 b 0.33 0.51 c 0.19 0.25 d 4.80 5.00 d1 2.14 2.44 e 3.80 4.00 e1 2.14 2.44 e 1.27 bsc h 5.80 6.20 h.0250.50 l 0.40 1.27 0o 8o
si2457/34/15/04-si3008 72 preliminary rev. 0.7 c ontact i nformation silicon laboratories inc. 4635 boston lane austin, tx 78735 tel: 1+(512) 416-8500 fax: 1+(512) 416-9669 toll free: 1+(877) 444-3032 email: isoinfo@silabs.com internet: www.silabs.com silicon laboratories, silicon labs, and isomodem are registered trademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and omissions, and disclaims responsib ility for any consequences resu lting from the use of information included herein. additionally, silicon laboratorie s assumes no responsibility for the functioning of undescribed features or parameters. silicon laboratories reserves the right to make changes without further notice . silicon laboratories makes no wa rranty, rep- resentation or guarantee regarding the suitability of its products for any particular purpose, nor does silicon laboratories as sume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any an d all liability, including wi thout limitation conse- quential or incidental damages. silicon laborat ories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the silicon laboratories product could create a s ituation where per- sonal injury or death may occur. should buyer purchase or us e silicon laboratories products for any such unintended or unauthor ized ap- plication, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages.

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