applied micro circuits corporation 6195 lusk blvd., san diego, ca 92121 ? (619) 450-9333 page 1 october 23, 1995 bicmos pecl clock generator ? preliminary evaluation manual the s6006 evaluation manual describes two evalua- tion boards that allow demonstration of amcc's S3015/s3016 e4/stm-1/oc-3 sonet/sdh/atm in- terface circuits. this document provides information on board contents and layout. it should be used in conjunction with the S3015/s3016 data sheet, which contains full technical details on chip operation. figure 1 depicts a block diagram of circuit functional- ity. power is supplied to the boards from external raw supplies connected through the on-board power con- nections. connectors allow easy access to all of the interface signals on the S3015/s3016 chips. all re- quired external circuitry, including transformers and passive components, are provided on the boards. for additional detail on the interface circuitry or for applications examples, contact amcc for the S3015/ s3016 system interface application note. figure 1. functional block diagram S3015/s3016 evaluation board s6006 S3015 refckin refckin serdatip serdatin serdatip serdatin rstb cmisel xfrmdrvb xfrmdrva serdatop serdaton rstb refckin serclkon serdatop serdaton bufout bufin losref equalsel losopt tstclken andatin losin crystal oscillator s3016 gnd 75 cable cable output (bnc) gnd monitor output (bnc) serdaten gnd cable input (bnc) losin compensator equalizer vcc serclkop serclkon serclkop xfrmen dlcv tstclken cmisel dctb dctb cvtb vbuf+ vbuf cvtb vbuf+ vbuf cvtb vbuf+ vbuf cvtb vbuf+ vbuf vcc push button switch vcc push button switch dip switches dip switches dctb = dut controlled termination buffer cvtb = controllable voltage termination buffer
applied micro circuits corporation 6195 lusk blvd., san diego, ca 92121 ? (619) 450-9333 page 2 october 23, 1995 table 1. power connection recommended operating conditions electrical connections separate boards are provided for the S3015 and the s3016 chips. layouts for both boards are de- picted in figures 2 and 3, showing the location of connectors and components. the various connec- tions are described in the following sections. power connections connections are provided on the board for ground and vcc. refer to table 1 for recommended oper- ating conditions. power supply nominal input voltage vcc 5 v ground 0 v S3015/s3016 evaluation board s6006 rst gnd serdaten xfrmen cmisel dlcv tstclken serdatip refckin serdatin a gnd dut_vcc gnd vbuf+ gnd vbuf gnd xformer xformer b jp1 dipswitch refckout tx_cable output tx_monitor output gnd S3015a serclkop serclkon serdatop serdaton buffer buffer buffer xtal figure 2. S3015 board layout
applied micro circuits corporation 6195 lusk blvd., san diego, ca 92121 ? (619) 450-9333 page 3 october 23, 1995 cable connections - transmitter two bnc connectors allow connection to the follow- ing two output signals. (see figure 2 for locations.) tx_cable_output. transformer output. drives the g.703 specified 75 w cable. the g.703 output mask can be measured at this point. a 75 w smb connector is included for impedance matching and easy inter- facing to a 75 w cable. tx_monitor_output. transformer output. drives the monitor point as specified in g.703. this output is identical to the tx_out signal. a probe socket is included to allow for easy measurements of trans- former output. cable connections - receiver a bnc connector allows connection to the following input signal. (see figure 3 for location.) rx_cable_input. transformer input. receives the g.703 compliant signal. the g.703 input waveforms and loss-of-signal detection levels are specified at this connector. a 75 w smb connector is included for impedance matching and easy interfacing to a 75 w cable. S3015/s3016 evaluation board s6006 rst losref ctrl s3016a gnd xtal losopt cmisel equalsel tstclken serdatip refckin serdatin a serclkop serclkon serdaton equalizer and losin compensator circuitry serdatop dut_vcc gnd vbuf+ gnd vbuf gnd buffer xformer b jp1 dipswitch losout buffer buffer rx_cable input refckout lcv figure 3. s3016 board layout
applied micro circuits corporation 6195 lusk blvd., san diego, ca 92121 ? (619) 450-9333 page 4 october 23, 1995 overhead processor connections - transmitter reset. ttl input. initializes the S3015 to a known logic state. serdatip/n. differential ac-coupled pecl. sma connector that drives the serial data inputs to the cmi encoder circuit. this input should be supplied with nrz data at the appropriate data rate. (see table 2.) refckin. ttl input. sma connector that must be supplied with the correct reference clock frequency. (see table 2.) used by the S3015 to synthesize the serial clock. serdatop/n. differential pecl. this output is the delayed version of the incoming data stream updated on the falling edge of serclkop/n. serclkop/n. differential pecl. this output is phase-aligned with serdatop/n. refckin. ttl input. sma connector that must be supplied with the correct reference clock frequency. (see table 2.) used by the s3016 to initialize the receive clock recovery pll. the reference clock must be present during reset to guarantee initialization of the pll circuits. serdatop/n. differential ac-coupled pecl output. sma connector that drives the decoded cmi data to the overhead processor. serclkop/n. differential pecl. this output is phase-aligned with serdatop/n. losout. ttl output. when high, this signal indi- cates that the clock recovery pll is detecting valid data at the serial data inputs and is attempting to lock to it. when low, the clock recovery pll is locked to refckin. refckout. ttl input. clock output that is at the same frequency as the refckin input. dip switch - receiver an onboard dip switch provides additional control ca- pability on the receiver board. the following four sig- nals are controlled by means of the dip switch: losopt. pecl. active low. this input is driven by the external optical receiver module to indicate a loss of received optical power. cmisel. ttl input. a logic high selects cmi mode; a logic low selects nrz. equalsel. ttl input. a logic high selects andatin. a logic low selects serdatip/n. tstclken. ttl. active high. enables the reference clock to be used in place of the vco for testing. allows a way to test the chip without the use of the pll. crystal reference a 19.44 mhz or a 17.408 mhz differential ecl crystal oscillator can be used for the reference clock. one 19.44 mhz crystal is provided on each board. if a 17.408 mhz reference frequency is needed, amcc can recommend crystal vendors. jumper configuration the jumpers labeled jp1 on both boards allow the user to control whether an onboard crystal reference or external clock reference is used (see crystal ref- erence above). jumper a is installed when an exter- nal reference is used, and jumper b is installed when the onboard crystal reference is used. mode ref clk freq serial data rate (refckin/p) mhz (serdatip/n, tx_out) mbits/s sts-3 cmi 19.44 155.52 e4 cmi 17.408 139.264 dip switch - transmitter an onboard dip switch provides additional control ca- pability on the transmitter board. the following five signals are controlled by means of the dip switch: serdaten. ttl input. enables the loopback path from the S3015 to the s3016. the data from the serdatip/n inputs will be cmi-encoded and sent to the s3016, where it will be decoded and output on the serdatop/n pins. xfrmen. ttl input. enables the transformer outputs tx_out and mon_out. cmisel. ttl input. selects cmi or nrz. logic high selects cmi mode, and logic low selects nrz mode. dlcv. singled-ended pecl input. only active in cmi mode. set high to force a cmi line code violation. tstclken. ttl input. enables the reference clock to be used instead of the vco for testing, allowing a means of testing chip functions without the use of the pll. overhead processor connections - receiver reset. ttl input. initializes the s3016 to a known logic state. serdatip/n. differential pecl. clock is recovered from transitions on these inputs. table 2. operating frequencies S3015/s3016 evaluation board s6006
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