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  3. AR# 10256: 3.1i Virtex-E PAR - Problem with DLLIOB "SelectIO" input and placement

AR# 10256

3.1i Virtex-E PAR - Problem with DLLIOB "SelectIO" input and placement

Description

Keywords: DLLIOB, SelectIO, placer, placement

Urgency: Standard

General Description:
When the DLLIOB uses the FastFeedback pin, it should act as an input. If
the DLLIOB uses a "SelectIO" STD, it is not being seen as an input; consequently,
the placement is incorrectly allowing other I/Os into the VREF sites. The problem
is caught by the general DRC of PAR.

Solution

A workaround is to lock the I/O.

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 4.
AR# 10256
Date 10/21/2008
Status Archive
Type General Article