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AR# 25098

ChipScope Serial I/O Toolkit, Virtex-4 IBERT - Some patterns do not work if 8b/10b is enabled with a 16-bit fabric width

Description

For Virtex-4 FPGAs in ChipScope Pro, when I use the IBERT Core, the higher-level PRBS does not work if 8b/10b is enabled with a 16-bit fabric width. PRBS 20, 23, 29, 31, and the framed counter pattern cause bit errors when used with 8b/10b enabled.

Solution

This issue affects only the 16-bit fabric width. To work around this issue, use a 32-bit fabric width.

AR# 25098
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article