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AR# 17395

5.2i Virtex-II MAP - Valid FF/LUT to BLKRAM pack (-bp) ignored due to list processing error

Description

Keywords: FF, LUT, BRAM, BLKRAM, -bp, XIL_MAP_BRAM_FILE

Urgency: Standard

General Description:
The FF/LUT to BRAM packing feature (-bp) supports using a file that lists the net names of the output nets of FFs that should be packed into BRAM. These FFs are only eligible for the BRAM pack if the FF is driven by LUT logic that can also be targeted to the BRAM. The file name is identified with the following environment variable:

PCs
SET XIL_MAP_BRAM_FILE=filename

Workstations
setenv XIL_MAP_BRAM_FILE filename

The following list processing bug is occurring:

If one entry in the list is ineligible for a BRAM pack, then the next entry is incorrectly skipped even if it is eligible for a BRAM pack.

Solution

This problem is under investigation. Meanwhile, you can work around this issue by eliminating ineligible nets from the list.
AR# 17395
Date Created 06/05/2003
Last Updated 09/26/2006
Status Archive
Type General Article