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AR# 31305

10.1 ChipScope Pro IBERT - PRBS Data generated by the Virtex-4 IBERT core is inverted for PRBS-23/31

Description

PRBS Data generated by the Virtex-4 IBERT core is inverted for PRBS-23 and PRBS-31. This can cause link failures when connecting a link with a Virtex-5 device which does not do this. How do I work around this issue?

Solution

If this is causing link failures, the work-around is to invert the TX polarity on the Virtex-4 data.

AR# 31305
Date Created 07/16/2008
Last Updated 12/15/2012
Status Active
Type General Article