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| rev. 1.2 8/06 copyright ? 2006 by silicon labora tories si2456/33/14 patents pending ordering information this data sheet is valid only for those chipset combinations listed on page 69. pin assignments 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 si2456/33/14 clkin/xtali xtalo clkout/eecs/a0 d6 vd3.3 gnd vda rts/d7 rxd/rd txd/wr cts/cs reset aout/int int/d0 ri/d1 eesd/d2 vdb gnd vd3.3 c1a esc/d3 dcd/d4 isob eeclk/d5 qe2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 dct ignd c1b rng1 rng2 qb qe vreg vreg2 ref rext2 rext rx filt filt2 1 si3015 si2456/33/14 v.90, v.34, v.32 bis iso modem ? c hipset with i ntegrated g lobal daa features applications description the si2456 is a complete, itu-v.90-compliant, 56 kbps modem chipset with integrated direct access arrangement (daa) that provides a programmable line interface to meet global telephone line requirements with a single design. available in two small packages, it eliminates the need for a separate dsp data pump, external ram and rom, modem controller, codec, isolation transformer, relays, opto-isolators, and 2- to 4- wire hybrid. the isomodem ? chipset is ideal for embedded modem applications due to its small board space, low power consumption, and global compliance. the si2433 and si2414 products offer all the same features as the si2456 with connect rates of up to 33.6 kbps and 14.4 kbps, respectively. functional block diagram data modem formats itu-t, bell 300 bps up to 56 kbps v.42, v.42bis, mnp2-5 automatic rate negotiation caller id decode 3.3 v power no external rom or ram required uart with flow control at command set support integrated daa over 5000 v capacitive isolation parallel phone detect globally-compliant line interface overcurrent detection fast connect parallel interface call progress support firmware upgradeable set-top boxes e-mail terminals point-of-sale terminals digital video recorders security systems remote monitoring serial interface parallel interface microcontroller dsp daa interface ram/rom pll clocking si3015 clkin/xtali xtalo clkout rxd txd cts rts dcd esc ri int reset c1a to phone line aout data bus cs wr rd a0 d0-d7 isob
si2456/33/14 2 rev. 1.2 si2456/33/14 rev. 1.2 3 t able of c ontents section page 1. electrical specificat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3. bill of materials: si2456/33/ 14 chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4. functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 4.1. digital interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 4.2. serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 4.3. parallel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.4. command mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 4.5. data mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 4.6. fast connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.7. v.29 fast connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.8. clocking/low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.9. data compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.10. error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9 4.11. wire mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.12. caller id operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 4.13. parallel phone detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.14. overcurrent detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.15. global operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.16. firmware upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 4.17. eeprom interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.18. at commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7. parallel interface registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8. pin descriptions: si2456/33/14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 9. pin descriptions: si3015 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 10. ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 11. package outline: 24-pi n tssop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 12. package outline: 16-pin soic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 document change list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74 si2456/33/14 4 rev. 1.2 1. electrical specifications table 1. recommended operating conditions parameter 1 symbol test condition min 2 typ max 2 unit ambient temperature t a k-grade, f-grade 0 25 70 c ambient temperature t a b-grade ?40 25 85 c si2456/33/14 supply voltage, digital 3 v d 3.0 3.3 3.6 v notes: 1. the si2456/33/14 specifications are guar anteed when the typical application circuit (including component tolerance) and any si2456/33/14 and any si3015 are used. see "t ypical application schematic" on page 11. 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 si2456/33/14 interface supports 5 v logic (clkin/xtali supports 3.3 v logic only). si2456/33/14 rev. 1.2 5 table 2. daa 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, act 1 =1 dct = 11 (ctr21) ??7.5v dc termination voltage v tr i l = 42 ma, act = 1 dct = 11 (ctr21) ? ? 14.5 v dc termination voltage v tr i l = 50 ma, act = 1 dct = 11 (ctr21) ??40 v dc termination voltage v tr i l = 60 ma, act = 1 dct = 11 (ctr21) 40 ? ? v dc termination voltage v tr i l = 20 ma, act = 0 dct = 01 (japan) ??6.0v dc termination voltage v tr i l = 100 ma, act = 0 dct = 01 (japan) 9??v dc termination voltage v tr i l = 20 ma, act = 0 dct = 10 (fcc) ??7.5v dc termination voltage v tr i l = 100 ma, act = 0 dct = 10 (fcc) 9??v on-hook leakage current i lk v tr =?48v ? ? 7 a operating loop current i lp fcc/japan modes 13 ? 120 ma operating loop current i lp ctr21 13 ? 60 ma dc ring current 2 dc flowing through ring detection circuitry ?? 7 a ring detect voltage 3 v rd rt = 0 11 ? 22 v rms ring detect voltage 3 v rd rt = 1 17 ? 33 v rms ring frequency f r 15 ? 68 hz ringer equivalence number 4 ren ? ? 0.2 notes: 1. act = u67, bit 5; dct = u67, bits 3:2; rt = u67, bit 0; rz = u67, bit 1. 2. r25 and r26 installed. 3. the ring signal is guaranteed to not be detected below t he minimum. the ring signal is guaranteed to be detected above the maximum. 4. c15, r14, z2, and z3 not installed. rz = 0. si2456/33/14 6 rev. 1.2 figure 1. test circuit for loop characteristics table 3. dc characteristics, v d =3.3v (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 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, 13,14,16,23,24 r pu 50 100 200 k total supply current * i d v d33 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 =0ma). si3015 tip ring 10 f 600 i l v tr + ? si2456/33/14 rev. 1.2 7 table 4. daa ac 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 sample rate fs ? 9.6 ? khz crystal oscillator frequency f xtl ?4.9152? mhz transmit frequency response low ?3 dbfs corner ? 5 ? hz receive frequency response low ?3 dbfs corner ? 5 ? hz transmit full scale level 1 v fs ?1?v peak receive full scale level 1 v fs ?1?v peak dynamic range 2,3,4 dr act 5 = 0, dct 5 = 10 (fcc) i l =100 ma ?82?db dynamic range 2,3,6 dr act = 0, dct = 01 (japan) i l =20ma ?83?db dynamic range 2,3,4 dr act = 1, dct = 11(ctr21) i l =60ma ?84?db transmit total harmonic distortion 4,7 thd act = 0, dct = 10 (fcc) i l =100ma ??85?db transmit total harmonic distortion 5,7 thd act = 0, dct = 01 (japan) i l =20ma ??76?db receive total harmonic distortion 6,7 thd act = 0, dct = 01 (japan) i l =20ma ??74?db receive total harmonic distortion 4,7 thd act = 1, dct = 11 (ctr21) i l =60ma ??82?db aout dynamic range vin = 1 khz ? 40 ? db aout thd vin = 1 khz ? 40 ? db aout full-scale level ? 0.7v dd ?v pp aout mute level ? 60 ? db notes: 1. measured at tip and ring with 600 termination at 1 khz. 2. dr = 20 x log |vin| + 20 x log (rms signal/rms noise). 3. measurement is 300 to 3400 hz. applies to transmit and receive paths. 4. vin = 1 khz, ?3 dbfs, fs = 10300 hz. 5. act = u67, bit 5; dct = u67, bits 3:2. 6. vin = 1 khz, ?6 dbfs, fs = 10300 hz. 7. thd = 20 x log (rms distortion/rms signal). si2456/33/14 8 rev. 1.2 table 5. absolute maximum ratings parameter symbol value unit dc supply voltage v d 4.1 v input current, si2456/33/14 digital input pins i in 10 a 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 absolute 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. table 6. switching characteristics (v d = 3.0 to 3.6 v, t a = 0 to 70 c for k-grade) parameter symbol min typ max unit clkout output clock frequency 2.4576 ? 39.3216 mhz baud rate accuracy t bd ?1 ? 1 % cts or rts high to start bit t rts 10 ? ? ns 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 ?? 2 0n s data hold t dh 10 ? ? ns rd high to hi-z time t dz ?? 3 0n s 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 si2456/33/14 rev. 1.2 9 figure 2. asynchronous uart seri al interface ti ming 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 si2456/33/14 10 rev. 1.2 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 si2456/33/14 rev. 1.2 11 2. typical application schematic rtsb/d7 rxd/rdb txd/wrb ctsb/csb resetb d6 clkout/eecs/a0 eeclk/d5 dcdb/d4 esc/d3 aout/intb intb/d0 rib/d1 eesd/d2 ring tip vcc note 1: r12, r13 and c14 are only required if complex ac termination is used (act bit = 1). note 2: see "ringer impedance" section for optional czech r epublic support. note 3: see "billing tone immunity" section for optional billing tone filter (germany, switzerland, south africa). decoupling caps for u1 vd note 5: l1,l2, c38, c39, r31, r32 are for en55022/cispr-22 conducted distur bance compliance. note 4: r27, r28, d3, d4, z4, z5, rv2 may be populated for enhanced lightning option. refer to an48 for layout guidelines please submit layout to silicon labs for review prior to pcb fabrication. d3 rv2 q3 c3 r10 d1 z5 c39 rv1 c36 r32 c22 r28 c38 u2 si3015 tsta/qe2 1 tstb/dct 2 ignd 3 c1b 4 rng1 5 rng2 6 qb 7 qe 8 vreg 9 nc/vreg2 10 nc/ref 11 dct/rext2 12 rext 13 rx 14 nc/filt 15 tx/filt2 16 r31 r19 r16 fb1 l1 r17 fb2 r9 z4 c37 + c5 r11 y1 1 2 r6 q1 c16 d2 r5 c4 r12 c13 r18 c30 c26 c18 r2 c27 r25 c20 c1 q2 r26 c19 r13 c10 z1 + c14 r8 c25 r7 c7 r15 c24 r24 c9 r27 u1 si2456/33/14 clkin/xtali 1 xtalo 2 clkout/eecs/a0 3 d6 4 vd3.3 5 gnd 6 vda 7 rts/d7 8 vdb 17 gnd 18 vd 3.3 19 isob 20 c1a 21 esc/d3 22 dcd/d4 23 eeclk/d5 24 cts/cs 11 rxd/rd 9 txd/wr 10 reset 12 ri/d1 15 eesd/d2 16 aout/int 13 int/d0 14 q4 c8 c35 + c12 c6 l2 d4 si2456/33/14 12 rev. 1.2 3. bill of materials: si2456/33/14 chipset component value supplier(s) c1,c4 1 150 pf, 3 kv, x7r, 20% novacap, venkel, johanson, murata, panasonic c3,c13,c35,c36 0.22 f, 16 v, x7r, 20% novacap, venkel, johanson, murata, panasonic c5 2 0.1 f, 50 v, elec/tant, 20% venkel, johanson, murata, panasonic c6,c10,c16,c37 0.1 f, 16 v, x7r, 20% novacap, venkel, johanson, murata c7,c8 3 560 pf, 250 v, x7r, 20% novacap, venkel, johanson, murata, panasonic c9 22 nf, 250 v, x7r, 20% novacap, venkel, johanson, murata, panasonic c12 1.0 f, 16 v, tant, 20% venkel, panasonic c14 2 0.68 f, 16 v, x7r/elec/tant, 20% novacap, venkel, aux, murata, panasonic c18,c19 3 3.9 nf, 16 v, x7r, 20% novacap, venkel, johanson, murata c20 0.01 f, 16 v, x7r, 20% novacap, venkel, johanson, murata c22 4 1800 pf, 50 v, x7r, 20% not installed c24,c25 1 1000 pf, 3 kv, x7r, 10% novacap, venkel, johanson, murata, panasonic c26,c27 33 pf, 16 v, npo, 5% novacap, venkel, johanson, murata c30 4 10 pf, 16 v, npo, 10% not installed c38,c39 2,5 47 pf, 16 v, x7r, 10% venkel d1,d2 6 dual diode, 300 v, 225 ma central semiconductor d3,d4 1 bav99 dual diode, 70 v, 350 mw diodes inc., onsemiconductor, fairchild fb1,fb2 ferrite bead, 600 , 25%, 200 ma murata l1,l2 2,5 68 h, 120 ma, 4 max, 10% murata, panasonic q1,q3 a42, npn, 300 v onsemiconductor, fairchild, zetex q2 a92, pnp, 300 v onsemiconductor, fairchild, zetex q4 7 bcp56, npn, 60 v, 1/2 w onsemiconductor, fairchild notes: 1. the si2456/33/14 design survives up to 3500 v l ongitudinal surges without r27, r28, d3, d4, z4, and z5. adding the r27, r28, d3, d4, z4, and z5 enhanced lightning options incr eases longitudinal surge survival to gr eater than 6600 v. the isolation capacitors , c1, c4, c24, and c25, must also be rated to greater than the su rge voltage. y-class capacitors are recommended for highest surge survival. 2. for fcc-only designs, c14, c38, c39, r12, r13, r31, and r32 are not required (leave si3015 pin 12 unconnected); l1 and l2 may be replaced with a short; r2 may be 5%; with z1 rated at 18 v, c5 may be rated at 16 v; also see note 9. 3. if the auto answer, ring detect, and caller id features are not used, r9, r10, c7, and c8 may be removed. 4. c22 and c30 may provide an additional improvement in emis sions/immunity, depending on design and layout. population option recommended. see ?an70: si2456/si2433/si2414/si24 03 modem designer?s guide? for details. 5. compliance with en55022 and/or cispr-22 conduc tance disturbance tests requires the following: l1, l2, c38, c39, r31, and r32; d1 and d2 must be 400 v rated, and rv2 must be populated. see also ?en55022 and cispr-22 compliance? in ?an70: si2456/ si2433/si2414/si2403 modem designer?s guide?. 6. several diode bridge configurations are accept able (suppliers include gener al semi., diodes inc.) 7. q4 may require copper on board to meet 1/2 w power requirement. (contact manufacturer for details.) 8. rv2 can be installed to improve perform ance for multiple longitudinal surges. 9. the r7, r8, r15, and r16, r17, r19 resistors ma y each be replaced with a single resistor of 1.78 k , 3/4 w, 1%. for fcc-only designs, 1.78 k , 1/16 w, 5% resistors may be used. 10. if the parallel phone detection feature is not used, r25 and r26 may be removed. 11. to ensure compliance with itu specifications, frequency toler ance must be less than 100 ppm including initial accuracy, 5-year a ging, 0 to 70 c, and capacitive loading. crystals with 50 ppm initial accuracy typically satisfy this requirement. si2456/33/14 rev. 1.2 13 rv1 sidactor, 275 v, 100 a teccor, st microelectronics, microsemi, ti rv2 5,8 270 v, mov not installed r2 2 402 , 1/16 w, 1% venkel, panasonic r5 100 k , 1/16 w, 1% venkel, panasonic r6 120 k , 1/16 w, 5% venkel, panasonic r7,r8,r15,r16,r17,r19 9 5.36 k , 1/4 w, 1% venkel, panasonic r9,r10 3 56 k , 1/10 w, 5% venkel, panasonic r11 9.31 k , 1/16 w, 1% venkel, panasonic r12 2 78.7 , 1/16 w, 1% venkel, panasonic r13 2 215 , 1/16 w, 1% venkel, panasonic r18 2.2 k , 1/10 w, 5% venkel, panasonic r24 150 , 1/16 w, 5% venkel, panasonic r25,r26 10 10 m , 1/16 w, 5% venkel, panasonic r27,r28 1 10 , 1/10 w, 5% venkel, panasonic r31,r32 2,5 470 , 1/16 w, 5% venkel, panasonic u1 si2456/33/1 4 silicon labs u2 si3015 silicon labs y1 4.9152 mhz, 20 pf, 100 ppm 11 , 150 esr not installed z1 1 zener diode, 43 v, 1/2 w vishay, onsemiconductor, rohm z4,z5 1 zener diode, 5.6 v, 1/2 w vishay, onsemiconductor, rohm component value supplier(s) notes: 1. the si2456/33/14 design survives up to 3500 v l ongitudinal surges without r27, r28, d3, d4, z4, and z5. adding the r27, r28, d3, d4, z4, and z5 enhanced lightning options incr eases longitudinal surge survival to gr eater than 6600 v. the isolation capacitors , c1, c4, c24, and c25, must also be rated to greater than the su rge voltage. y-class capacitors are recommended for highest surge survival. 2. for fcc-only designs, c14, c38, c39, r12, r13, r31, and r32 are not required (leave si3015 pin 12 unconnected); l1 and l2 may be replaced with a short; r2 may be 5%; with z1 rated at 18 v, c5 may be rated at 16 v; also see note 9. 3. if the auto answer, ring detect, and caller id features are not used, r9, r10, c7, and c8 may be removed. 4. c22 and c30 may provide an additional improvement in emis sions/immunity, depending on design and layout. population option recommended. see ?an70: si2456/si2433/si2414/si24 03 modem designer?s guide? for details. 5. compliance with en55022 and/or cispr-22 conduc tance disturbance tests requires the following: l1, l2, c38, c39, r31, and r32; d1 and d2 must be 400 v rated, and rv2 must be populated. see also ?en55022 and cispr-22 compliance? in ?an70: si2456/ si2433/si2414/si2403 modem designer?s guide?. 6. several diode bridge configurations are accept able (suppliers include gener al semi., diodes inc.) 7. q4 may require copper on board to meet 1/2 w power requirement. (contact manufacturer for details.) 8. rv2 can be installed to improve perform ance for multiple longitudinal surges. 9. the r7, r8, r15, and r16, r17, r19 resistors ma y each be replaced with a single resistor of 1.78 k , 3/4 w, 1%. for fcc-only designs, 1.78 k , 1/16 w, 5% resistors may be used. 10. if the parallel phone detection feature is not used, r25 and r26 may be removed. 11. to ensure compliance with itu specifications, frequency toler ance must be less than 100 ppm including initial accuracy, 5-year a ging, 0 to 70 c, and capacitive loading. crystals with 50 ppm initial accuracy typically satisfy this requirement. si2456/33/14 14 rev. 1.2 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 12.0 kbps 9600 bps 7200 bps 4800 bps 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 itu-t v.34 or v.32bis itu-t v.34, v.32bis, or v.29 itu-t v.34 or v.32bis itu-t v.34 or v.32bis itu-t v.34 or v.22bis itu-t v.22bis, v.23, or bell 212a itu-t v.21 bell 103 notes: 1. supported on si2456 only. 2. supported on si2456 and si2433 only. si2456/33/14 rev. 1.2 15 data format bit asynchronous selectable 8, 9, 10, or 11 bits per character 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 12.0 kbps 9600 bps 9600 bps 9600 bps 7200 bps 4800 bps 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 itu-t v.32 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% 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 si2456 only. 2. supported on si2456 and si2433 only. si2456/33/14 16 rev. 1.2 receive carrier itu-t v.90 1 itu-t v.34 2 itu-t v.32bis itu-t v.32 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 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 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 carrier no dialtone ok ring ringing table 7. protocol characteristics (continued) item specification notes: 1. supported on si2456 only. 2. supported on si2456 and si2433 only. si2456/33/14 rev. 1.2 17 4. functional description the isomodem ? chipset is a complete embedded- modem chipset with integrated direct-access arrangement (daa) that provides a programmable line interface to meet global telephone line requirements. available in two small packag es, this solution includes a dsp data pump, a modem controller, on-chip ram and rom, an analog front end (afe), a daa, and analog output. the si2456/33/14 accepts standard modem at commands and provides connect rates up to 56/33.6/ 14.4 kbps full-duplex over the public switched telephone network (pstn). the si2456/33/14 features a complete set of modem protocols including all itu-t standard formats up to 56 kbps. the si2456/33/14 provides numerous additional features for embedded modem applications. the modem includes full caller id detection and decoding for global standards. call progress is supported through echoing result codes and is also programmable to meet global settings. because the si2456/33/14 int egrates the daa, analog features, such as parallel phone detect, overcurrent detection, and global ptt co mpliance with a single design, are included. this device is ideal for embedded modem applications due to its small board space, low power consumption, and global compliance. the si2456/33/14 solution includes a silicon daa using silicon laboratories? proprietary capacitive isol ation technology. this highly- integrated daa can be programmed to meet worldwide ptt specifications for ac termination, dc termination, ringer impedance, and ringer thre shold. in addition, the si2456/33/14 has been designed to meet the most stringent worldwide requirements for out-of-band energy, billing-tone immunity, li ghtning surges, and safety requirements. the si2456/33/14 is designed to be rapidly incorporated into existing modem applicat ions. the device interfaces directly through either a serial uart to a microcontroller or to a pc through a standard rs-232 transceiver. this interface allows for pc evaluation of the modem immediately upon powerup via the at commands using standard terminal software. the si2456/33/14 also provides an 8-bit parallel port. the si2456/33/14 solution requires only a few low-cost discrete components to achieve global compliance. see the "typical application schematic" on page 11. 4.1. digital interface the isomodem chipset digital i/o can be configured as either a serial uart interface with flow control or as a parallel 8-bit interface. selection of a serial or parallel i/o interface is determined by the state of aout/int (si2456/33/14, pin 13) during the rising 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. additionally, when selecting parallel mode, cs should remain high until after the rising edge of reset . configuration of pins 3, 4, 8?11, 13?16, and 22?24 is determined by this interface selection. 4.2. serial interface the isomodem chipset supports data terminal equipment (dte) rates up to 307.2 kbps with the standard serial uart format. upon powerup, the uart defaults to a 19.2 kbps baud rate. if a pulldown resistor 10 k is placed between d2 (si2456/33/14, pin 16) and gnd (si2456/33/14, pin 6), the dte rate is set by the autobaud feature after reset. the serial interface also pr ovides a hardware pin, dcd (data carrier detect), which remains low as long as the si2456/33/14 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). 4.2.1. autobaud the isomodem chipset 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 placing a pulldown resistor < 10 k between d2 (pin 16) and gnd. 4.3. parallel interface the parallel interface is an 8-bit data bus with a single bit address. figure 3 on page 10 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 63. if a0 = 1, the data bus represents a read/write to the ?parallel interface 1 (0x01)? register on page 64). si2456/33/14 18 rev. 1.2 4.4. command mode upon reset, the isomodem chipset 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 12 on page 35 and enters data mode. 4.5. data mode the isomodem chipset is in data mode while it has a connection to another modem or is in the process of establishing a connection. in command and data mode, the si2456/33/14 operates in asynchronous dte mode only. data protocols are available to provide error correction to improve reliability (v.4 2 and mnp2-4) and data compression to increase throughput (v.42bis and mnp5). each connection between two modems in data mode begins with a handshakin g sequence. during that 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. 4.6. fast connect the isomodem chipset 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, v.22bis, bell103, bell212, and v.29 modulations. in additi on, the si2456/33/14 may be set to either default asynchronous data communications equipment (dce) mode or a transparent hdlc synchronous mode. 4.7. v.29 fast connect in addition to the low modulation speed fast connect modes, the isomodem chipset also supports a fast connect mode based on the 9600 bps v.29 fax modulation standard. in order to provide a time-critical interface from the host to the si2456/33/14, the si2456/ 33/14 uses an interface derived from the fax class 1 at command set. see ?an70: si2456/si2433/si2414/ si2403 modem designer?s guide? for more details. 4.8. clocking/low power modes the isomodem chipset contains an on-chip phase- locked loop (pll) and clock generator. using either a single crystal or master cl ock input, the si2456/33/14 can generate all the internal clocks required to support the featured modem protocol s. either a 4.9152 mhz clock (3.3 v max input?see table 5 on page 8) on xtali or a 4.9152 mhz crystal across xtali and xtalo form the master clock (100 ppm max) for the si2456/33/14. this clock source is sent to an internal pll that generates all necessary internal system clocks including the dsp clock. figure 5 shows a block diagram of how the dsp clock and the clkout are derived. using the s24 s-register, the si2456/33/14 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 si2456/33/14 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 si2456/33/14 may be placed in a complete powerdown mode . complete powerdown is accomplished via u65[13] (pdn). once the pdn bit is written, the si2456/33/14 completely powers down and can only be powered back on via the reset pin. a 78.6432 mhz/(r1 + 1) clock is produced on the clkout pin that may be used as an external system clock. r1 may be programmed via u5e to any value between 1 and 31 (default value = 31). si2456/33/14 rev. 1.2 19 figure 5. dsp and clkout generation 4.9. data compression the modem can achieve dte (host-to-isomodem chipset) 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. the modem is, thus able to transmit more data in a given period of time. 4.10. error correction the isomodem chipset can employ error-correction (reliable) protocols to ensure error-free delivery of asynchronous data sent between the host and the remote end. the si2456/33/14 supports v.42 and mnp2-4 error correction protocols. v.42 (lapm) is most commonly used and is enabled by default. 4.11. wire mode wire mode is used to communicate with standard non- error correcting modems. w hen optioned with \n3, the isomodem chipset falls back to wire mode if it fails in an attempt to negotiate a v.42 or mnp link with the remote modem. error correction and data compression are not active in wire mode. 4.12. caller id operation the isomodem chipset supports full type 1 caller id detection and decode for the us bellcore, european etsi, uk, and japanese caller id protocols. caller id is enabled via the +vcid and +vcdt commands. 4.13. parallel phone detection the isomodem chipset 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 si2456/33/ 14 is using the phone line. 4.13.1. on-hook line -in-use de tection when the isomodem chipset is sharing the telephone line with other devices, it is im portant that it not interrupt a call in progress. to detect whether another device is using the shared telephone line, the host can use the si2456/33/14 to monitor the tip-ring dc voltage with the lvcs (line voltage and current sense) register (u79, bits 4:0). see figure 6 on page 20 . see also the %vn commands for automati c line-in-use detection. 4.13.2. off-hook intrusion detection when the isomodem chipset is off-hook, an algorithm is implemented in the si2456/33/14 to automatically monitor the tip-ring loop current via the lvcs register. when the si2456/33/14 is off-hook, the lvcs register switches from representing the tip-ring voltage to representing the tip-ring current. (see figure 7 on page 20 .) upon detecting an intrusion, the si2456/33/14 alerts the host to the condition via the int pin. (r1 + 1) 78.6432 mhz pll to internal clocking 1 < r1 < 31 4.9152 mhz clkin (pin 1) clkout (pin 3) si2456/33/14 20 rev. 1.2 figure 6. loop voltage figure 7. loop current 0 3 6 9 12 15 18 21 24 28 30 33 36 39 42 45 47 51 54 57 60 63 66 69 72 100 0 5 75 78 81 84 87 lvc s bits loop voltage (v) 10 15 20 25 30 0 3 6 9 1215182124 30333639 424548515457 60636669 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 si2456/33/14 rev. 1.2 21 4.14. overcurrent detection the isomodem chipset includes an overcurrent detection feature that measur es the loop current at a programmable time after the si2456/33/14 goes off- hook. this allows the si2456/33/14 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. in the ctr21 mode of operation, the overcurrent detection can trip unnecessarily for loop current values greater than 55 ma. therefore, if the si2456/33/14 is in ctr21 mode and an overcurrent condition is detected, the host should switch the si2456/33/14 into fcc mode and check the lvcs register for a valid overcurrent value equal to 0x1f. 4.15. global operation the isomodem chipset contai ns an integrated silicon direct-access arrangement (silicon daa) that provides a programmable line interface to meet international telephone line interface requirements. ?an70: si2456/ si2433/si2414/si2403 modem designer?s guide? gives the daa register settings required to meet international ptt standards. additionally, the user-access registers (via the at:u and at:r commands) may be programmed for country- specific settings, such as dial tone, ring, ringback, and busy tone. see an70 for complete details. 4.16. firmware upgrades the isomodem chipset contains an on-chip program rom that includes the firmware required for the features listed in this data sheet. in addition, the si2456/ 33/14 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 an70 for further information. 4.17. eeprom interface the isomodem chipset supports an optional serial peripheral interf ace (spi) bus serial eeprom. the eeprom must support spi mode 3 with a 16-bit (8 kbit ? 64 kbit range) address. upon powerup, if a pulldown resistor 10 k is placed between d6 (si2456, pin 4) and gnd, the si2456 attempts to detect an eeprom. an installed eeprom may contain custom default settings, firmware up grades, and/or user-defined at command macros for use in custom at commands or country codes. 4.18. at commands at powerup, the si2456/33/14 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 8.) si2456/33/14 22 rev. 1.2 table 8. basic at command set (command defaults in bold) command action $ display at command mode settings. a answer incoming call. a/ re-execute last comma nd. this is the only command not preceded by ?at? or followed by a si2456/33/14 rev. 1.2 23 i0 display si2456/33/14 revision code. b: revision b c: revision c, etc. i1 display si2456/33/14 firmware revision code (numeric). i3 display line-side revision code. 15d = si3015 revision d i6 display the si2456/33/14 model number. ?2414? = si2414 ?2433? = si2433 ?2456? = si2456 i7 diagnostic results 1. see ?an70: si2456/si2433/si2414/si2403 modem designer?s guide? for details. i8 diagnostic results 2. see an70 for details. 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 12 on page 35) q1 disable result codes (enable quiet mode). r initiate v.23 reversal. sn s-register operation (see table 13 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 12 on page 35). v0 numeric result codes. v1 verbal result codes xn call progress monitor (cpm)?this command controls which cpm signals are monitored and reported to the host from the si2456/33/14. (see table 12 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 di al tone detection to x1 mode. does not blind dial. x3 extended results and detect busy only ?add busy tone detection to x1 mode. table 8. basic at command set (command defaults in bold) (continued) command action si2456/33/14 24 rev. 1.2 x4 extended results, full cpm?full cpm enabled, connect message includes speed. x5 extended results?full cpm enabled including ring back detection. adds ri ngback 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 command is functionally equival ent to pulsing the reset pin low. (see t at in table 6 on page 8.) :e read from serial eeprom. :i interrupt read?this command causes the si2456/33/14 to report the lower 8 bits of the interrupt register i/o control 0 (u70). the cid, ocd, ppd, and ri bits are also 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 supplied by silicon labs to the si2456/33/14. the format for this command is at :paaaa,xxxx,yyyy,.... where aaaa is the first address in hexadecimal, and xxxx,yyyy,.... is data in hexadecimal. only one :p command is allowed per at command line. no other commands can be concatenated in the :p command line. this command is only for use with special files provided by silicon laboratories. do not attempt to use this command for any other purp ose. use &t6 to display checksum for patch ver- ification. :r user-access register read?this command allows the user to read from the user-access regis- ters. (see pages 41?59.) 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 41.) the 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. +fclass = x class 1 mode enable. x mode 0off 1 enables support for class 1 mode for use in the v.29 fast connect mode. +frm = x class 1 transmit carrier. x mode 2 detect 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. table 8. basic at command set (command defaults in bold) (continued) command action si2456/33/14 rev. 1.2 25 +ftm = x class 1 transmit carrier. x mode 2 transmit v.21 (980 hz) tone and detect (2100/2225 hz) tone. stop transmit 980 hz when 2100/2225 detected. 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 si2456/33/14 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 si 2456/33/14 to normal operation after test. 95 v.29 short synchronous. 96 v.29 full synchronous. table 8. basic at command set (command defaults in bold) (continued) command action si2456/33/14 26 rev. 1.2 +gci = x country settings - auto matically configure all regist ers for a particular country. x country 0 japan 9 australia aaustria f belgium 16 brazil 1b bulgaria 20 canada 26 china 27 columbia 2e czech republic 31 denmark 35 ecuador 3c finland 3d france 42 germany 46 greece 50 hong kong 51 hungary 53 india 57 ireland 58 israel 59 italy 61 south korea 69 luxembourg 6c malaysia 73 mexico 7b netherlands 7e new zealand 82 norway 87 paraguay 89 philippines 8a poland 8b portugal 9c singapore 9f south africa a0 spain a5 sweden a6 switzerland b8 russia b4 united kingdom b5 united states fe taiwan note: u-registers are configured to silicon laboratorie s? recommended values. changes may be made by writing individual registers after sending the at+g ci command. several countries use the same configurations as the united kingdom and the un ited states. refer to ?an93: modem designer?s guide? for details. +gci = ? list all possible country code settings. +gci? list current country code sett ing (response is: + gci: si2456/33/14 rev. 1.2 27 +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 table 8. basic at command set (command defaults in bold) (continued) command action si2456/33/14 28 rev. 1.2 4.19. extended at commands the extended at commands are supported by the si2 456/33/14 and are described in tables 9 through 11. table 9. extended at& command set (command defaults in bold) command action &$ display at& current settings. &d0 esc (pin 22) is not used. &d1 esc (pin 22) escapes to command mode from data mode if also enabled by hes u70, bit 15. &d2 esc (pin 22) assertion during a modem connection causes the modem to go on-hook and return to command mode. &d3 esc (pin 22) assertion causes atz command (reset and return ok result code). &gn line connection rate limit?this command sets an upper limit on the line speed that the si2456/33/ 14 can connect. note that the &hn commands may lim it 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 &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 si2414) &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 si2456 and si2433) &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 si2456) &h1 v.90 only (56 kbps to 28 kbps) &h2 v.34 with automatic fallback (33.6 kbps to 300 bps) (default for si2433) &h3 v.34 only (33.6 kbps to 2400 bps) &h4 itu-t v.32bis with automatic fallback (14.4 kbps to 300 bps) (default for si2414) &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) si2456/33/14 rev. 1.2 29 &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 si2456/33/14 for 10 pulse-per-second pulse dialing. for japan. &p1 configure si2456/33/14 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 test. &t2 initiate itu-t v.54 (analoop) test. modulation se t by &h at command. te st loop is through the dsp (si2456/33/14 device) only. the si2456/33/14 ec hoes 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 se t by &h at command. te st loop is through the dsp (si2456/33/14), daa interface section (si245 6/33/14), capacitive interface (si3015), and ana- log hybrid circuit (si3015). si2456 /33/14 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 re moved from the test loop by setting the dl bit (u62, bit 1). &t4 initiate transmit as originating modem with auto matic 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-u pgradeable section of program memory. if no firmware upgrade is installed, &t6 returns 0xde5c. &xn automatic determination of telephone line type. &x0 abort &x1 or &x2 command. &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). table 9. extended at& command set (command defaults in bold) (continued) command action si2456/33/14 30 rev. 1.2 &x2 same as &x1, but y resu lt (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. table 10. 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 or \n3), 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 si2456/33/14 will auto-answer a call in answer mode. %o2 si2456/33/14 will auto-answe r a call in originate mode. %vn automatic line status detection. after the %v1 and %v2 commands are issued, the si24 56/33/14 will automatica lly check the tele- phone connection for whether or not a line is present. if a line is present, the si2456/33/14 will auto- matically check if the line is already in use. finally, the si2456/33/14 will check line status both before going off-hook and again before dialing. %v1 uses the fixed method and %v2 uses the adap- tive method. %v0 (default) disables this feature. %v0 disable automatic line-in-use detection. table 9. extended at& command set (command defaults in bold) (continued) command action si2456/33/14 rev. 1.2 31 %v1 automatic line status detection?fixed method. description: before going off-hook with the atd, ato, or ata commands, the si2456/33/14 com- pares the line voltage (via lvcs) to registers noln (u83) and lius (u84): loop voltage action 0 lvcs nolnreport ?no line? and remain on-hook. noln lvcs liusreport ?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 algorithm (described in "off-hook intrusion detec- tion" on page 19) oper ates normally. in addition, the si2456/33/14 will report ?no line? if the tele- phone line is completely disconnected. if the hoi bi t (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 si2456/33/14 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) < lcvsgo 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 si2456/33/14 to eliminate er rors 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 algorithm does not allow any non-zero values for nliu belo w 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 "off-hook intrusion detection" on page 19) op erates normally. in addi tion, the si2456/33/14 will report ?no line? if the telephone line is completely disconnected. if the hoi (u77, bit 11) bit is set, ?line in use? is reported upon intrusion. table 10. extended at% command set (command defaults in bold) (continued) command action si2456/33/14 32 rev. 1.2 table 11. extended at\ command set (command defaults in bold) command action \$ display at\ command settings. \bn character length will be auto matically 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 si2456/33/14 attempts to connect with the mnp protocol. if unsuccessful, the call is dropped. \n3 v.42 auto-reliable?the si2456/33/14 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 si2456/33/14 drops the call instead of connecting in mnp or wire mode. \n5 v.42 and mnp reliable mode - the si2456/33/14 attempts to connect with v.42. if unsuccessful, mnp is attempted. if mnp is 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?note that this may on ly 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. 3. default is \t16 if a pulldown is connected to pin 16; otherwise, the default is \t9. si2456/33/14 rev. 1.2 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 changing rates, t he result code ?ok? is sent at the old dte rate. all options except \t16 lock the dte to the given rate, and subsequent commands must be sent at this rate. when \t16 is used (or at reset when pi n 16 is pulled down), automatic bandrate detection is used for subsequent commands. \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 3 \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. table 11. 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. 3. default is \t16 if a pulldown is connected to pin 16; otherwise, the default is \t9. si2456/33/14 34 rev. 1.2 \u serial mode?causes a low pulse (25 ms) on ri and dcd . int to be the inverse of esc. rts to be the inverse of cts . parallel mode?causes a low pulse (25 ms) on int . this command terminates with a reset . \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. *note: table 11. 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. 3. default is \t16 if a pulldown is connected to pin 16; otherwise, the default is \t9. si2456/33/14 rev. 1.2 35 table 12. result codes numeric 1 meaning verbal response x0 x1 x2 x3 x4 x5 0 command was successful ok x x x x x x 1 link established at 300 bps or higher connect x x x x x x 2 incoming ring detected ring x x x x x x 3 link dropped no carrier x x x x x x 4 command failed error x x x x x x 5 link establish at 1200 connect 1200 x x x x x 6 dial tone not present no dialtone x x x 7 line busy busy x x x 9 ringback detected ringing x 10 link established at 2400 connect 2400 x x x x x 11 link established at 4800 connect 4800 x x x x x 12 link established at 9600 connect 9600 x x x x x 14 link established at 19200 connect 19200 2 xxxxx 15 link established at 7200 connect 7200 x x x x x 16 link established at 12000 connect 12000 x x x x x 17 link established at 14400 connect 14400 x x x x x 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 30 caller id mark detected cidm x x x x x x 75 link established at 75 connect 75 x x x x x 31 hookswitch flash detected flash x x x x x x 32 uk cid state tone alert signal detected stas xxxxxx 33 overcurrent condition x 3 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 notes: 1. numeric result codes are of the format: result code si2456/33/14 36 rev. 1.2 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 \v command. 77 v.42 protocol protocol: v42 set with \v command. 79 v.42bis protocol protocol: v42bis set with \v command. 80 mnp2 protocol protocol: alternate, + class 2 set with \v command. 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 set with \v command. 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 table 12. result codes (continued) numeric 1 meaning verbal response x0 x1 x2 x3 x4 x5 notes: 1. numeric result codes are of the format: result code si2456/33/14 rev. 1.2 37 the connect messages shown in table 12 are sent when link negotiation is complete. 100 link established at 53333 connect 53333 4 xxxxx 101 link established at 54666 connect 54666 4 xxxxx 102 dtmf dial attempted on a pulse dial only line unobtainable number x x x x x x table 12. result codes (continued) numeric 1 meaning verbal response x0 x1 x2 x3 x4 x5 notes: 1. numeric result codes are of the format: result code si2456/33/14 38 rev. 1.2 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 13 su mmarizes the s-register set. table 13. s-register descriptions definition s-register (decimal) function default (decimal) range units 0 automatic answer?number of rings the si2456/33/14 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?number of seconds the si2456/ 33/14 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 si2456/33/ 14 waits for carrier before timing out. this register also sets the number of seconds the modem waits for ring- back 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 ?c arrier loss debounce time.? 06 1?255 0.1 seconds 10 carrier loss timer?time the carrier must be lost before the si2456/33/14 disconnects. setting 255 dis- ables disconnect entirely. if s10 is less than s9, even a momentary loss of carrier causes a disconnect. 14 1?255 0.1 seconds 12 escape code guard timer?minimum guard time required before and after ?+++? for the si2456/33/14 to recognize a valid escape sequence. 50 1?255 0.02 seconds 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 si2456/33/14 rev. 1.2 39 24 sleep inactivity time?sets the time that the modem operates in normal power mo de 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?maximum 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 a ll data is transmitted before timeout. s38 = 255 disables timeout and modem dis- connects only if data is su ccessfully 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 0 0?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 0 0?5 ? table 13. s-register descriptions (continued) definition s-register (decimal) function default (decimal) range units si2456/33/14 40 rev. 1.2 42 blacklisting?the si2456/33 /14 will not dial the same number more than three times in three minutes. an attempt to dial a fourth time within three minutes will result in a ?blacklisted? re sult 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 at tempts that will result in a number being blacklisted. 004 0?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 attemp t 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. 1 0?9 ? table 13. s-register descriptions (continued) definition s-register (decimal) function default (decimal) range units si2456/33/14 rev. 1.2 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 14. u-register descriptions 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 ?an70: si2456/si2433/si2414/si2403 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 si2456/33/14 42 rev. 1.2 u17 bt1a0 bt1 registers set the coefficients for stage 1 of the busy tone detect filter. default is for fcc countries. see an70 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 multiplie d by 7200. 0x0870 u2f bdlt busy cadence delta in seconds 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 multip lied by 7200. 0x4650 u32 rdlt ringback cadence delta in seconds multiplied by 7200. 0xef10 u33 rmot ringback cadence minimum on time in seconds multiplied by 7200. 0x1200 u34 dtwd window to look for dialtone in seconds multiplied by 1000. 0x1b58 table 14. u-register descriptions (continued) register name description default si2456/33/14 rev. 1.2 43 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 interdig it time (ms units). 0x0320 u46 dtpl dtmf power level? 16-bit format 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 si2456/33/14 stays on-hook during this time. 0x0000 u4f fht flash hook time. time corresponding with ?!? or ?&? dial modifier that the si2456/33/14 goes on-hook during a flash hook (ms units). 0x01f4 u50 lcdn loop current debounce on time (ms units). 0x015e table 14. u-register descriptions (continued) register name description default rgfd 2400hz 1 min ring freq (hz) ---------------------------------------------- - ?? ?? 1 max ring freq (hz) ----------------------------------------------- - ?? ?? ? = si2456/33/14 44 rev. 1.2 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 corresponds 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 u65 daac4 this is a bit-mapped register. 0x00e0 u66 daac5 this is a bit-mapped register. 0x0049 u67 itc1 this is a bit-mapped register. 0x0008 u68 itc2 this is a bit-mapped register. 0x0000 u69 itc3 this is a bit-mapped register. 0x0006 u6a itc4 this is a bit-mapped register. n/a u6e ck1 this is a bit-mapped register. 0x1f20 u6f ptmr this is a bit-mapped register. 0x00ff u70 io0 this is a bit-mapped register. 0x2700 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. n/a u7a gena this is a bit-mapped register. 0x0000 u7c genc this is a bit-mapped register. 0x0000 u7d gend 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 th e 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 reduction in 1333 bps units. 0x0000 uaa v29e v29 epos handshake enable. (see an70.) 0x0000 table 14. u-register descriptions (continued) register name description default si2456/33/14 rev. 1.2 45 table 15. 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 llc lcn u53 mod2 rev u62 daac1 foh dl u65 daac4 pwm pwmg pdn pdl u66 daac5 fdt u67 itc1 off ohs act dct[1:0] rz rt u68 itc2 lim bte rov btd u69 itc3 dial fjm vol flvm mode u6a itc4 ovl u6e ck1 r1[4:0] u6f ptme ptmr[7:0] u70 io0 hes tes cidm ocdm ppdm rim dcdm cid ocd ppd ri dcd u76 gen1 ohsr[6:0] 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 hdlc fast u7c genc rigpo rig- poen u7d gend lvfe llv ausdc atzd fdp uaa v29mode v29ena si2456/33/14 46 rev. 1.2 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 llc lcn type 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 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. 8 ftp force tone or pulse. 0 = disable. 1 = enable. 7 spdm 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 reserved read returns zero. si2456/33/14 rev. 1.2 47 reset settings = 0x0000 reset settings = 0x0804 1llc low loop current detect (required for ctr21). 0 = disabled. 1 = enabled. 0 lcn loop current needed. 0=no. 1 = yes. u53 mod2 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 beyond the isolation link, out to and including the analog hybrid circuit. 1 = enables digital loopback mode across isolation barrier only. 0 reserved must be set to 0. bit name function si2456/33/14 48 rev. 1.2 reset settings = 0x00e0 u65 daac4 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name pwm pwmg pdn pdl type r/w r/w r/w r/w bit name function 15 pwm pwm mode. 0 = normal. classic pwm output waveform. 1 = scrambled mode. low-distortion mode if used with output circuit shown in ?an70: si2456/ si2433/si2414/si2403 modem designer?s guide?. 14 pwmg pwm gain. 0=no gain. 1 = 6 db gain applied to aout. 13 pdn powerdown. completely powerdown the si2456/33/14 and si301 5. once set to 1, the si2456/33/14 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 si3015 in powerdown mode. 3:0 reserved must not change in a read-modify-write. *note: typically used only for board-level debug. si2456/33/14 rev. 1.2 49 reset settings = 0x0049 u66 daac5 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name fdt type r bit name function 15:7 reserved read returns zero. 6fdt* frame detect. 0 = indicates isolation link has not established frame lock. 1 = indicates isolation link 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. si2456/33/14 50 rev. 1.2 reset settings = 0x0008 u67 itc1 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name off ohs act dct[1:0] rz rt type r/w r/w r/w r/w r/w r/w bit name function 15:8 reserved read returns zero. 7off dc termination off. 0 = normal operation. the off bit must always be set to 0 when on-hook. 1 = dc termination disabled and the device presents an 800 dc impedance to the line, which is used to enhance operation with an off-hook parallel phone. 6ohs on-hook speed. 0 = the si2456/33/14 will execute a fast on-hook. 1 = the si2456/33/14 will execute a slow controlled on-hook. 5act ac termination select. 0 = selects the real impedance. 1 = selects the complex impedance. 4 reserved read returns zero. 3:2 dct[1:0] dc termination select. 00 = low voltage mode (transmit level = ?13.85 dbm). 01 = japan mode (transmit level = ?11.85 dbm). 10 = fcc mode. standard voltage m ode (transmit level = ?9.85 dbm). 11 = ctr21 mode. current limiting mode (transmit level = ?9.85 dbm). 1rz ringer impedance. 0 = maximum (high) ringer impedance. 1 = synthesize ringer impedance. c15, r14, z2, and z3 must not be installed when setting this bit. see the ?ringer impedance? section in ?an70: si2456/si2433/si2414/si2403 modem designer?s guide?. 0rt ringer threshold select. used to satisfy country requirements on ring de tection. signals below the lower level do not generate a ring detection; signals above t he upper level are guaranteed to generate a ring detection. 0 = 11 to 22 v rms . 1 = 17 to 33 v rms . si2456/33/14 rev. 1.2 51 reset settings = 0x0000 u68 itc2 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name lim bte rov btd type r/w r/w r/w r/w bit name function 15:8 reserved read returns zero. 7:5 reserved do not modify. 4lim current limit. 0 = all other modes. 1 = ctr21 mode. 3 reserved do not modify. 2bte billing tone protect enable. 0 = disabled. 1 = enabled. when set, the daa responds automatically to a collapse of the line-derived power supply dur- ing a billing tone event. when of f-hook, if bte = 1 and btd goes high, the dc termination is released (800 presented to line). if bte and rim (u70, bit 9) are set, an ri (u70, bit 1) interrupt also occurs when btd goes high. 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. 0btd billing tone detected. this bit is set if a billing tone is detected. this bit is cleared by writing a 0 to this location. 0 = no billing tone. 1 = billing tone detected. si2456/33/14 52 rev. 1.2 reset settings = 0x0006 u69 itc3 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name dial fjm vol flvm mode type r/w r/w r/w r/w r/w bit name function 15:8 reserved read returns zero. 7 reserved do not modify. must be set to zero. 6dial dtmf dialing mode. this bit should be set during dtmf dialing in ctr21 mode if lvcs < 12. 0 = normal operation. 1 = increase headroom for dtmf dialing. 5fjm force japan dc termination mode. 0 = normal gain. 1 = when dct = 2 (fcc mode), setting this bit forces japan dc termination mode while allow- ing for a transmit level of ?1 dbm. see the ?d tmf dialing? section in ?an70: si2456/si2433/ si2414/si2403 modem designer?s guide?. 4vol line voltage adjust. when set, this bit adjusts the tip-ring line voltage. lowering th is voltage improves margin in low-voltage countries. raising this voltage may improve large-signal distortion performance. 0 = normal operation. 1 = lower dct voltage. 3flvm force low voltage mode. when dct (u67, bits 3:2) = 10 (fcc mode), setting flvm forces the low voltage mode (see dct = 00) while allowing for a tr ansmit level of ?1 dbm. 0 = disable. 1 = enable. 2mode mode. this bit enables on-hook line monitoring. it is automatically set while on-hook and cleared while off-hook. 1:0 reserved do not modify. si2456/33/14 rev. 1.2 53 reset settings = n/a reset settings = 0x1f20 u6a itc4 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name ovl type r bit name function 15:3 reserved read returns zero. 2ovl* overload detected. this bit has the same function as rov but clears itself after the overload has been removed. see the ?billing tone detection? section in ?an70: si2456/si2433 /si2414/si2403 modem designer?s guide?. this bit is not affected by the bte bit. 1:0 reserved do not modify. 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 r/w bit name function 15:13 reserved do not modify. 12:8 r1*[4:0] r1 clkout divider 0 clkout off. r1 r1 + 1 (default r1 = 31; 2.4576 mhz). r1 = 31 required for proper codec interface operation. 7:0 reserved do not modify. note: see figure 5 on page 19. si2456/33/14 54 rev. 1.2 reset settings = 0x00ff u6f ptmr bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 (msec units). see ?an70: si2456/si2433/si2414/ si2403 modem designer?s guide? for more details. si2456/33/14 rev. 1.2 55 reset settings = 0x2700 u70 io0 bit d15d14d13d12d11d10d9 d8 d7 d6 d5d4d3d2d1d0 name hes tes cidm ocdm ppdm rim dcdm 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 ocd will activate int. (?x? resu lt code is generated 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 transiti on 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 si2456/33/14 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). si2456/33/14 56 rev. 1.2 reset settings = 0x3240 u76 gen1 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name ohsr[6:0] facl dcl[2:0] acl[4:0] type r/w 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, see figure 7 on page 20). acl represents the value of lvcs current when the si2456/33/14 is off-hook and all parallel phones are on-hook. if acl = 0, it is ignored by the off-hook intrusion algorithm.the si2456/ 33/14 will also write acl with the contents of lvcs before an intrusi on and before going on- hook (default = 0). si2456/33/14 rev. 1.2 57 reset settings = 0x401e u77 gen2 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 the time the si2456/33/14 goes off-hook and the time the off-hook intrusion algorithm begins. default is 1 s. 11 hoi hang-up on intrusion. 0 = si2456/33/14 will not automatically hang up when an off-hook ppd interrupt occurs. 1 = si2456/33/14 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 overcurrent protection. enable overcurrent protection. 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). si2456/33/14 58 rev. 1.2 reset settings = 0x0000 u78 gen3 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 time, starting when dialing begins, that the off- hook intrusion algorithm is blocked (suspended) (default = 00000000 b ). si2456/33/14 rev. 1.2 59 u79 gen4 bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 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 depending on the state of the mode, ofhk, and onhm bits. on-hook voltage monitor (2.75 v/bit 20%) (see figure 6 on page 20). 00000 = no line connected. 00001 = minimum line voltage (v min = 3.0 v 0.5 v). 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 u69[2] (mode) must be set to 1 b before reading lvcs while the si2456/33/14 is on-hook. see mode on page 52. u69[2] (mode) must be disabled (mode = 0 b ) before the si2456/33/14 can go off-hook, dial, or answer a call. off-hook loop current monitor (3 ma/bit) (see figure 7 on page 20). 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 ctr21 overload > 54 ma in ctr21 mode si2456/33/14 60 rev. 1.2 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 hdlc fast type 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 dete ction (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 seco nds, the si2456/33/14 will redial the first digit and remaining digits as pulse. if a dialtone is not present after two seconds, the si2456/33/14 will dial the remaining digits as dtmf. 5:2 reserved read returns to zero. 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. si2456/33/14 rev. 1.2 61 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 15), follows this bit when rigpioen = 1 b . 3:1 reserved reads returns to zero. 0 rigpoen 0 = ri indicates valid ring sign al (normal ring-indicator mode). 1 = ri (pin 15) can be used as a general-pu rpose output and follo ws u7c[4] (rigpo). si2456/33/14 62 rev. 1.2 reset settings = 0x0000 reset settings = 0x0000 u7d gend bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name lvfe llv ausdc atzd fdp type r/w r/w r/w r/w r/w bit name function 15:14 reserved reads returns to zero. 13 lvfe lvcs filter enable. 0 = normal operation 1 = enables optional filtering on lvcs to mitigate the effect of 50/60 hz noise on tip/ring volt- age. 12:11 reserved read returns zero. 10 llv 0 = normal operation. 1 = enables an optional algorithm for countries, such as japan and malaysia, with low loop voltage. also set u67[3:2] (dct) = 00 b , u69[4] vol = 1 b , and u52 = 0x0002 before going off- hook. when the modem goes off-hook, it samp les lvcs and changes dct and vol as nec- essary to maximize transmit le vels and optimize distortion. 9ausdc 0 = normal operation. 1 = causes the modem to go off-hook in japan mode and then revert to fcc mode after 500 ms. this allows the modem to meet the australian line seizure requirements while allow- ing the maximum transmit power (optional for australia and when dct = 01 b ). 8:2 reserved reads returns to zero. 1 atzd atz disable. 0 = atz functions normally. 1 = disable atz command. this may be used to ensure modem settings are not lost in some systems. 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. uaa v.29 mode bit d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 name v29ema type r/w bit name function 15:2 reserved read returns zero. 1v29ena 0 disables v.29. 1 enables v.29 0 reserved read returns zero. si2456/33/14 rev. 1.2 63 7. parallel interface registers reset settings = 0x00 parallel interface 0 (0x00) bitd7d6d5d4d3d2d1d0 name tx/rx type r/w bit name function 7:0 tx/rx 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. si2456/33/14 64 rev. 1.2 reset settings = 0110_0011 parallel interface 1 (0x01) bitd7d6d5d4d3d2d1d0 name rxf txe rem intm int esc rts cts type rrrr/wrr/wr/wr bit name function 7rxf receive fifo almost full (status). 0 = receive fifo (12 deep) contains th ree 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). txe interrupt will not trigger if the cts bit is inactive. therefore, the host do es not need to poll cts while waiting for trans- mit 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 si2456 /33/14 to operate 1 byte at a time rather th an 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 si2456/33/14 to operat e 1 byte at a time, rather than in blocks. si2456/33/14 rev. 1.2 65 8. pin descriptions: si2456/33/14 pin # pin name description 1 clkin/xtali clock input/crystal oscillator pin. this pin provides support for parallel-resonant, at-cut crystals. xtali also acts as an input in the event that an external clock source is used in place of a crystal. a 4.9152 mhz crystal or 4.9152 mhz clock is required. 2x t a l o crystal oscillator pin. this pin provides support for parallel-resonant at-cut crystals. xtalo 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. 4d6 data bit. bidirectional parallel bus da ta bit 6 in parallel mode. 5, 19 vd3.3 digital supply voltage. provides the 3.3 v digital suppl y voltage to the si2456/33/14. 6, 18 gnd ground. connects to the system digital ground. 7,17 vda, vdb digital rail. pin provides decoupling for the internal power supplies. 8rts /d7 request-to-send/data bit. request-to-send (for flow 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 clkin/xtali xtalo clkout/eecs/ao d6 vd3.3 gnd vda rts/d7 rxd/rd txd/wr cts/cs reset aout/int int/do ri/d1 eesd/d2 vdb gnd vd3.3 c1a esc/d3 dcd/d4 isob eeclk/d5 si2456/33/14 66 rev. 1.2 10 txd/wr transmit data/write enable. data input from dte txd pin in serial mode. active low write-enable pin in paral- lel mode. 11 cts /cs clear-to-send/chip select. active low clear-to-send (for flow control) in serial mode. active low 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 aout/int analog output/interrupt output. analog output in serial mode. active low interrupt output in parallel mode. 14 int /d0 interrupt output/data bit. active low interrupt output in serial mode. bidirectional parallel bus data bit 0 in parallel mode. 15 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. 16 eesd/d2 eeprom serial data input/output/data bit. bidirectional input/o utput to spi eeprom in serial mode. bidirectional parallel bus data bit 2 in parallel mode. 20 isob bias voltage. this pin provides decoupling for the power supply. 21 c1a isolation capacitor 1a. connects to one side of the isolation capacitor, c1. 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 eeclk/d5 eeprom clock/data bit. clock output for spi eeprom in serial mode . bidirectional parallel bus data bit 5 in parallel mode. pin # pin name description si2456/33/14 rev. 1.2 67 9. pin descriptions: si3015 pin # pin name description 1qe2 transistor emitter 2. connects to the emitter of q4. 2 dct dc termination. provides dc termination to the telephone network. 3ignd isolated ground. connects to ground on the line-side interface. also connects to capacitor c2. 4c1b isolation capacitor 1b. connects to one side of isolation capacitor c1. 5rng1 ring 1. connects through a capacitor to the tip lead of the telephone line. provides the ring and caller id signals to the modem. 6rng2 ring 2. connects through a capacitor to the ring le ad of the telephone line. provides the ring and caller id signals to the modem. 7qb transistor base. connects to the base of transistor q3. 8qe transistor emitter. connects to the emitter of transistor q3. 9vreg voltage regulator. connects to an external capacitor to provide bypassing for an internal power supply. 10 vreg2 voltage regulator 2. connects to an external capacitor to provide bypassing for an internal power supply. 11 ref reference. connects to an external resistor to provide a high-accuracy reference current. 12 rext2 external resistor 2. sets the complex ac termination impedance. 13 rext external resistor. sets the real ac termination impedance. qe2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 dct ignd c1b rng1 rng2 qb qe vreg vreg2 ref rext2 rext rx filt filt2 1 si2456/33/14 68 rev. 1.2 14 rx receive input. serves as the receive side input from the telephone network. 15 filt filter. provides filtering for the dc termination circuits. 16 filt2 filter 2. provides filtering for the bias circuits. pin # pin name description si2456/33/14 rev. 1.2 69 10. ordering guide chipset description system-side line-side temperature si2456 commercial si2456-kt si3015-ks 0 to 70 c si2456 commercial lead-free si2456-ft SI3015-F-FS 0 to 70 c si2456 industrial si2456-bt si3015-bs ?40 to 85 c si2433 commercial si2433-kt si3015-ks 0 to 70 c si2433 commercial lead-free si2433-ft SI3015-F-FS 0 to 70 c si2433 industrial si2433-bt si3015-bs ?40 to 85 c si2414 commercial si2414-kt si3015-ks 0 to 70 c si2414 commercial lead-free si2414-ft SI3015-F-FS 0 to 70 c si2414 industrial si2414-bt si3015-bs ?40 to 85 c si2456/33/14 70 rev. 1.2 11. package outline: 24-pin tssop figure 8 illustrates the package details for the si2456/33/14. tabl e 16 lists the values for the dimensions shown in the illustration. figure 8. 24-pin thin shrink small outline package (tssop) table 16. package diagram dimensions symbol millimeters typical* min max a ? 1.20 3 a1 0.05 0.15 3 b 0.19 0.30 c 0.09 0.20 3 d7.70 7.90 e 4.30 4.50 e0 . 6 5 b s c h6.40 bsc l 0.45 0.75 t 0 8 3 j 0.10 *note: to guarantee coplanarity ( j ), the parameters marked ?typical? may be exceeded. approximate device weight is 115.7 mg. j e h b d l t c a a1 e si2456/33/14 rev. 1.2 71 12. package outline: 16-pin soic figure 9 illustrates the package details for the si3015. table 17 lists the values for the dimensions shown in the illustration. figure 9. 16-pin small outline inte grated circuit (soic) package table 17. package diagram dimensions symbol millimeters typical* min max a 1.35 1.75 3 a1 .10 .25 3 b.33.51 c.19.25 3 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 j ?0.10 t 0o 8o 3 *note: typical parameters are for information purposes only. e h a1 b c h l t e see detail f detail f a 16 9 8 1 gauge plane 0.010 d seating plane j si2456/33/14 72 rev. 1.2 d ocument c hange l ist revision 1.0 to revision 1.1 updated "functional block diagram" on page 1. updated table 6 on page 8. expanded +gci country codes in table 8 on page 22. updated s-registers s43 and s44 in table 14 on page 41. added u-register ?uaa v.29 mode? on page 62. updated default register values for u66. updated u-register u7d. revision 1.1 to revision 1.2 updated "ordering guide" on page 69. si2456/33/14 rev. 1.2 73 n otes : si2456/33/14 74 rev. 1.2 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 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. a dditionally, silicon laboratorie s assumes no responsibility for the functioning of und escribed 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 without limitation conse- quential or incidental damages. si licon laboratories products are not designed, intended, or autho rized for use in applications intended to support or sustain life, or for any other application in which the failure of the silicon labor atories 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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