following questions frequently asked customers using HOTLinkEvaluation

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following questions frequently asked customers using HOTLinkEvaluation

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following questions frequently asked customers using HOTLinkEvaluation Boards. These cursory answers will serve introduction each topic. Separate application notes cover these topics more complete detail. convert CY9266-C (75) Evaluation Board cables? convert CY9266-C (75) board coax? convert CY9266-T (150) (shielded twisted-pair) board 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 37.4 replace them with resistors with value equal half transmission line characteristic impedance (i.e., cable). Table values used some common cable impedances. Extreme care must used avoid delamination board damage traces excessive heat during desoldering resoldering. change from higher lower impedance transmission lines (e.g., coax STP) also require that user change transformer Changes from lower higher impedance transmission lines usually require transformer changes. Alternatively, desirable resistors R55. these resistors added, built-in 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 characteristics source signal therefore usable distance with specific media type. Table 1.Cable Impedance Values Cable Impedance 46.4 37.4 24.9
convert CY9266-C (75) Evaluation Board cables (like CY9266-T)? convert CY9266-T (150) board cables (like CY9266-C)? Conversion CY9266-C CY9266-T boards transmission lines other than those shipped standard configurations simple changing transmission line connectors transmission 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 transformer secondaries. traces leading solder side board (Under convert balanced operation. CY9266-T: Carefully desolder remove Sub-D installed Replace with connector 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.
Cypress Semiconductor Corporation
3901 North First Street
Jose
95134 408-943-2600 December 1994 Revised 1995
Frequently Asked Questions About HotLink
What types Optical Modules compatible with CY9266-FX Evaluation Board? have tested shipping CY9266-F Evaluation Board with Siemens, AT&T Optical Modules. Table 2.Vendors Optical Modules Vendor (formerly AT&T) Siemens (formerly BT&D) AMP/Lytel Part Number 1408N HFBR-5302 V23806-A7-C2 DLT1040-ST-2 DLR1040-ST-2 269063-1 1408N XCVR HFBR-5302 Optical Data Link FC266 Transceiver Separate modules uses Fiber cabling Duplex Transceiver Mb/s 269063-1 Markings
These modules purchased from following vendors. Although this complete list Optical Module vendors, will serve starting point finding module that suit your needs: AMP/Lytel Division Chubb P.O. 1300 Somerville, 08876 (908) 685-2000 Corp 1201 Cumberland West Lafayette, 47906-1388 (317) 463-2565 Hewlett-Packard Components Division West Trimble Road Jose, 95131 (800) 535-7449 (408) 435-6342 Siemens Fiber Optic Components Commerce Totowa, 07512 (201) 890-1606 Sumitomo Electric Fiber Optics Corporation Sawmill River Road Tarrytown, 10591-6725 (914) 347-3770
this board compatible with (i.e., with IBM/HP card? HOTLink Evaluation Board intended allow easy evaluation Cypress HOTLink parts intended replace IBM® card system interface (although capable performing this function). compatibility offered with these boards allows familiar interface those systems 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 when Sync-Enable LOW. card will hold Byte-Sync Sync-Enable 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 "out 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. interface uses 850-nm short wave laser detector. HOTLink Evaluation board uses off-the-shelf 1300-nm 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 OLC-266 card. this signal under software control, should programmed allow signal loopback when signal active LOW. hardware controlled systems external signal inversion necessary, signal jumpered operation from S1-7 switch. physical size HOTLink Evaluation Board chosen compatible with two-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.
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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. 315-736-2206 315-736-2285 Nu-Power Optics 619-471-7131 FIBERTRON Tel: 714-871-3344 Fax: 714-871-5616 Belden Wire Cable 800-BELDEN-1 order 317-983-5200
Additional coaxial cables other accessories found through: Pasternack Enterprises 714-261-1920 First Source 408-371-1470 Newark 312-784-5100 Digi-Key Tel: 800-DIGI-KEY
this board bit-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 LOW. Ground external marked RCV_BISTEN switch S1-5 Place transmitting board's Transmitter BIST Transmit mode setting XMIT_BISTEN signal LOW. Ground external marked XMIT_BISTEN switch S1-1 Press white reset button receiving board. display should initially show receiver finds error data stream, will show this with increasing count. count exceeds 100, overflow indicator will light approximated error/hour 10-12 using 25.0-MHz oscillator shipped with board.
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 connections built With these items understood, set-up 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.) Note: Transmit Jitter measured board includes significant crosstalk from receive channel, coupled through transformer. Ideally, measure Transmit Jitter with quiet receive channel.
this board receiver jitter tolerance tests? ultimate performance serial link determined performance receiver. function receiver recover data from (seemingly arbitrary) serial data stream. This data stream translated several times, coupled though several non-linear devices subjected manner distortion. receiver must accept this serial pulse train recover high-speed bit-synchronous clock, de-jitter then separate DATA from CLOCK. Jitter tolerance typical term ability receiver correctly recover DATA CLOCK presence these many distortions. 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-In 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
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link. This requires different layout allow access power supply pins HOTLink chips without affecting operation other parts board. this board transmission-line tests? check maximum transmission-line length over which HOTLink Evaluation Board communicate, 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-MHz 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 external REFCLOCK 0.1% faster slower than on-board oscillator. Configure transmitter only send K28.5s either deasserting both signals, constantly transmitting C5.0 character 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 connectors. Loopback board either externally closing S1-7, 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.
Cypress Semiconductor Corporation, 1995. information contained herein subject change without notice. Cypress Semiconductor Corporation assumes responsibility circuitry other than circuitry embodied Cypress Semiconductor product. does convey imply license under patent other rights. Cypress Semiconductor does authorize products critical components life-support systems where malfunction failure reasonably expected result significant injury user. inclusion Cypress Semiconductor products life-support systems application implies that manufacturer assumes risk such doing indemnifies Cypress Semiconductor against charges.

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