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Appendix F: Debugging Guide
RocketIO Transceiver Specific Checks
Perform these additional checks when using a RocketIO transceiver:
•Directly monitor the following ports of the RocketIO by attaching error counters to them, or by triggering on them using Chipscope or an external logic analyzer.
RXDISPERR
RXNOTINTABLE
These signals should not be asserted over the duration of a few seconds, minutes or even hours. If they are frequently asserted, it may indicate a problem with the RocketIO. Consult Answer Record 19699 for debugging RocketIO issues.
•Place the RocketIO into parallel or serial loopback.
♦If the core exhibits correct operation in RocketIO serial loopback, but not when loopback is performed via an optical cable, it may indicate a faulty optical module.
♦If the core exhibits correct operation in RocketIO parallel loopback but not in serial loopback, this may indicate a RocketIO problem. See Answer Record 19699 for details.
•A mild form of bit error rate may be solved by adjusting the transmitter
TX_PREEMPHASIS, TX_DIFF_CTRL and TERMINATION_IMP attributes of the RocketIO.
•For
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| UG155 March 24, 2008 |