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AR# 10734

3.1i Virtex MAP - FDS and FDRS are incorrectly packed into the same slice.

Description

Keywords: Slice, mapped, packed, FDS, FDRS, set, reset, BY, SR, Init, Rev, logic, corruption

Urgency: Standard

General Description:
A case has been seen where MAP incorrectly packs an FDS and an FDRS into
the same slice. This has the effect of converting the FDS into an FDRS, as the
two registers share the Reset signal.

This problem will most likely be seen by Synplicity users, as their new synthesis
algorithms tend to generate more FDS registers.

Solution

This problem is fixed in the latest 3.1i Service Pack available at:
http://support.xilinx.com/support/techsup/sw_updates. The first
service pack containing the fix is 3.1i Service Pack 7.
AR# 10734
Date Created 01/05/2001
Last Updated 08/19/2002
Status Archive
Type General Article