following questions frequently asked customers using HOTLinkt Evaluati

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following questions frequently asked customers using HOTLinkt Evaluati

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Frequently Asked Questions about HOTLinkt Evaluation Boards
following questions frequently asked customers using HOTLinkt Evaluation Boards. These cursory answers will serve introduction each topic. Separate application notes cover these topics more complete detail. convert CY9266-C (75W) Evaluation Board cables? convert CY9266-C (75W) board coax? convert CY9266-T (150W) (shielded twisted pair) board 100W cables? Conversions CY9266-C CY9266-T boards transmission lines other than those shipped standard configurations simple changing transmission line termination resistors (R40 R41) back side board. Carefully remove ones currently board (presently 37.4W replace them with resistors with value equal half transmission line characteristic impedance (i.e., cable). Table values used some common cable imped ances. Extreme care must used avoid delamination board damage traces exces sive heat during desoldering resoldering. change from higher lower impedance transmission lines (e.g., coax 150W 100W STP) also require that user change transformer Changes from lower higher imped ance transmission lines usually require transformer changes. Alternatively, desirable resistors R55. these resistors added, built wire traces that currently short previously unused solder pads.) higher currents involved driving lower impedance transmission lines require either higher inductance transformer series current limiting resistors. impedance external cable changes, drive level must vary compensate. Part drive circuit, R62, needs change order vary drive current available. Table values required various cable impedances. Changes drive current will change spectral character istics souce signal therefore usable distance with specific media type. Table Cable Impedance Values Cable Impedance 392W 150W 261W 100W 46.4W 243W 37.4W 196W 24.9W 130W 6-347
Frequently Asked Questions about HOTLink Evaluation Boards
convert CY9266-C Evaluation Board convert CY9266-T (150 board
cables (like CY9266-T)? cables (like CY9266-C)?
Conversion CY9266-C CY9266-T boards transmission lines other than those shipped standard configurations simple changing transmission line connectors transmis sion line termination resistors (see answer question CY9266-C: Carefully desolder remove connectors installed Replace them with connector choice using mounting solder terminal holes provided. WARNING: CY9266-C board grounds shield coax, therefore side trans traces leading solder side board (Under
former secondaries.
convert balanced operation. CY9266-T: Carefully desolder remove installed Replace with nector choice using mounting solder terminal holes provided. three traces running solder side from were unground cable allow balanced operation. Reconnect these wires unbalanced cable connections. Changing connectors often also involves changing impedance cable used. question above about changing resistor values different values cable impedance.
What types Optical Modules compatible with CY9266-FX Evaluation Board?
have tested shipping CY9266-F Evaluation Board with Siemens, AT&T Optical Modules.
Table Vendors Optical Modules Vendor
(formerly AT&T) Siemens (formerly BT&D) AMP/Lytel HFBR 5302 V23806 DLT1040 DLR1040 269063-1 HFBR-5302 Optical Data Link FC266 ransceiver Separate modules uses Fiber cabling Duplex ransceiver Mb/s 269063
Part Number
1408N 1408N XCVR
Markings
These modules purchased from following vendors. Although this complete list Opti Module vendors, will serve starting point finding module that suit your needs:
AMP/Lytel Division Chubb 1300 Somerville, 08876 (908) 2000 Corp 1201 Cumberland West Lafayette, 47906-1388 (317) 2565
Hewlett Packard Components Division West rimble Road Jose, 95131 (800) 7449 (408) 6342 Siemens Fiber Optic Components Commerce otowa, 07512 (201) 1606
Sumitomo Electric Fiber Optics Corporation Sawmill River Road arrytown, 10591 6725 (914) 3770
this board compatible with (i.e., with
IBM/HP card?
HOTLink Evaluation Board intended allow easy evaluation Cypress HOTLink parts intended replace
card system interface (although capable performing
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Frequently Asked Questions about HOTLink Evaluation Boards
this function). compatibility offered with these boards allows familiar interface those tems already compatible with cards. system interface signals have same timing logical levels card. Drive loading similar, identical. function CY9266 Byte Sync output differs from that card will hold Byte Sync Sync Enable
card when Sync Enable LOW.
LOW, while CY9266 will Byte Sync HIGH each byte containing K28.5. When Sync Enable HIGH both boards will behave CY9266 does. CY9266 behavior convenient implementing simple lock" indicator using timers that detect interval between K28.5s (when Sync Enable LOW, misframed K28.5 does cause Byte Sync indication). CY9266 serial interface incompatible with card serial interface. inter face uses short wave laser detector. HOTLink Evaluation board uses shelf
1300 transmitters detectors copper transmission line interfaces. These various types compatible. operational link, compatible serial interfaces (i.e., CY9266 boards
same type, either ends transmission link.
Note:
active signal level LOOPBACK signal, implemented CY9266, opposite that
actual card. this signal under software control, should programmed allow signal loopback when signal active hardware controlled systems external signal inversion
necessary, signal jumpered operation from switch. physical size HOTLink Evaluation Board chosen compatible with channel version card. dimensions identical those product,
thickness protrusion serial interface hardware different from product. card includes plastic card guides attachment clips that facilitate production systems. HOTLink Evaluation Board none these components since intended
same function.
Where additional fiber optic cables accessories? Where additional coaxial cables cables?
have located following vendors fiber optic cables accessories. contact them receive further information about their offerings. lists below represent only some available sources.
Fiber Instrument Sales Inc. 2206 2285
Power Optics 7131
FIBERTRON 3344 Fax: 5616
Belden Wire Cable BELDEN order 5200
Additional coaxial cables other accessories found through:
Pasternack Enterprises 1920
First Source 1470
Newark 5100
Digi DIGI
this board error rate (BER) tests?
Connect board(s) with suitable length transmission line fiber from port board Port another itself). Place receiving board's Receiver BIST mode setting RCV_BISTEN signal Ground external marked RCV_BISTEN switch
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Frequently Asked Questions about HOTLink Evaluation Boards
Place transmitting board's Transmitter BIST Transmit mode setting XMIT_BISTEN LOW. Ground external marked XMIT_BISTEN switch Press white reset button receiving board. display should initially show receiver finds error data stream, will show this with increasing count. count ceeds 100, overflow indicator will light approximated error/hour shipped with board.
using 25.0
oscillator
this board transmitter jitter tests?
achieve best possible most accurate transmit jitter measurements, external environment HOTLink chips needs have lowest possible jitter start. Common oscilloscopes sources have much jitter obscure contribution transmitter. Additional sources jitter this board include:
versions: transformer's frequency characteristics. version: optical module. Layout these boards been optimized this testing, does have specific test connec tions built
With these items understood, adequate test requires quiet clock source digital oscilloscope such 11801 54720. version without optical module most convenient connections. Making connections board location differential PECL signals, will allow best measurements possible. (See HOTLink Jitter Characteristics" application note information measure jitter.) Transmit Jitter measured board includes significant crosstalk from receive channel, coupled through transformer. Ideally, measure Transmit Jitter with quiet receive channel.
Note:
this board receiver jitter tolerance tests?
ultimate performance serial link determined performance receiver. func tion receiver recover data from (seemingly arbitrary) serial data stream. This data stream translated several times, coupled though several linear devices subjected manner distortion. receiver must accept this serial pulse train recover high speed synchronous clock, jitter then separate DATA from CLOCK. Jitter tolerance typical term ability receiver correctly recover DATA CLOCK presence these many distor tions. HOTLink Receiver jitter tolerance measured connecting suitable transmission media between transmitter receiver, inserting jitter generation source similar that shown HOTLink Jitter Characteristics" application note. inserting measured jitter amplitudes watching output receiver, jitter tolerance measured. Further details fabrication jitter generator measurement techniques required accurate measurement this injected jitter beyond scope this note, covered detail HOTLink Jitter Characteristics" HOTLink Built Self Test (BIST)" application notes.
this board HOTLink power supply noise immunity tests?
layout design this board makes difficult test power supply immunity these parts. Power supply noise immunity testing requires injecting signal into power supply pins observing effect this injected signal link. This requires different layout allow access power supply pins HOTLink chips without affecting operation other parts board. 6-350
Frequently Asked Questions about HOTLink Evaluation Boards
this board transmission-line tests?
check maximum transmission line length over which HOTLink Evaluation Board municate, only necessary connect selected transmission line between ports HOTLink Evaluation Board. Using board with cable returning port boards cables simultaneous testing both/either directions transmission line will work quite well. HOTLink Transmitter Receiver BIST function serves purpose generating testing data user check acceptable error rate without extra test equipment. Transmission lines extended modified until BIST error count indicates unacceptable error rate. error rate approximately error/hour 1.1x10-12 using 25.0 oscillator shipped with board.
this board receiver-PLL acquisition-time tests?
kinds receiver acquisition measurable using this board. kind shows fast receiver recover from phase hop, other shows fast receiver acquire datastream once device powered with stable REFCLK. measure receiver recovery from phase hop, connect loopback cable with delay just large enough delay data almost half time shipped oscillator) with respect OUTC+ line that goes between CY7B923 CY7B933. Then arrange delayed synchronous switch signal into Select input receiver. Trigger this delay from delay this pulse point data stream where data stays HIGH several times. switching between delayed fast signal path, phase created input receiver. Increase delay until receiver shows pulse during BIST testing. receiver will properly recover data with phase large ±170_. Invert select signal other polarity phase hop.
observe receiver recovery from lost" data stream, arrange evaluation board have exter REFCLOCK 0.1% faster slower than board oscillator. Configure transmitter only send K28.5s either deasserting both signals, constantly transmitting C5.0 char acter Encoded mode. With clean pulse, switch select line input. This will cause receiver lost then found data stream. Using delayed trigger, watch output with respect transmit clock. clocks will match frequency stabilize phase difference less than
this board min/max frequency tests?
Arrange jumpers board that REFCLK same external clock input. this removing jumpers across pins IX-IY GY-HY, then jumpering pins GX-GY HX-IX. Apply external reference clock XMITCLOCK interface connec tors. Loopback board either externally closing which loops board back itself. enable both XMIT RCVR BIST functions transmitter. display should show stable number. Clear count pressing RESET button With board above, vary frequency external reference clock from nominal downward. approach limits operation, board will start indicate errors display. Clear errors after setting frequency pressing again. point frequency where BIST errors marks edge frequency range. Change your frequency source upward toward again clear error indications until achieve stable operation just below high frequency limit.
Typical boards will operate high 12.5 MHz.
HOTLink trademark Cypress Semiconductor. registered trademark International Business Machines Corporation.
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following questions frequently asked customers using HOTLinkt Evaluati

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