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AR# 13343

4.1i Virtex-II PAR - TBUFs are placed in conflict with locked TBUFs

Description

Keywords: LOC, locked, TBUF, BUFT, placer, placement, placed

Urgency: Standard

General Description:
The placer will sometimes create conflicting TBUF placements if there are locked TBUFs that do not use the first TBUF location in a TBUF cell, and if there is room to fit another TBUF set in the same cell.

Solution

1

This problem is fixed in the latest 4.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates.
The first service pack containing the fix is 4.1i Service Pack 3.

2

This problem can be avoided by ensuring that the first site in a TBUF cell is used whenever TBUFs are LOC'd. These site are TBUF_XAYB where A is a multiple of 8.
AR# 13343
Date Created 08/29/2007
Last Updated 10/23/2008
Status Archive
Type General Article