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AR# 21538

7.1i Virtex-II PRO MAP - Packer swaps DIFFM and DIFFS pads on IBUFDS_DIFF_OUT

Description

General Description:

7.1i MAP is incorrectly targeting the pad connected to the I pin of an IBUFDS_DIFF_OUT to a DIFFS component, and the pad connected to the IB pin to a DIFFM. This results in the following Pack Error:

"ERROR:Pack:1107 - Unable to combine the following symbols into a single DIFFM

component:

PAD symbol "SysClk_N" (Pad Signal = SysClk_N)

DIFFAMP symbol "sysclk_ibufg0/IBUFGDS_0/IBUFDS" (Output Signal =

SysClk180_int)

SlaveBuffer symbol "sysclk_ibufg0/IBUFGDS/SLAVEBUF.DIFFIN" (Output Signal =

sysclk_ibufg0/IBUFGDS/SLAVEBUF.DIFFIN)

Each of the following constraints specifies an illegal physical site for a

component of type DIFFM:

Symbol "SysClk_N" (LOC=AL18)

Please correct the constraints accordingly.

ERROR:Pack:1107 - Unable to combine the following symbols into a single DIFFS

component:

PAD symbol "SysClk_P" (Pad Signal = SysClk_P)

SlaveBuffer symbol "sysclk_ibufg0/IBUFGDS_0/SLAVEBUF.DIFFIN" (Output Signal

= sysclk_ibufg0/IBUFGDS_0/SLAVEBUF.DIFFIN)

DIFFAMP symbol "sysclk_ibufg0/IBUFGDS/IBUFDS" (Output Signal = SysClk_int)

Each of the following constraints specifies an illegal physical site for a

component of type DIFFS:

Symbol "SysClk_P" (LOC=AK18)

Please correct the constraints accordingly."

This is a regression from 6.3i packing behavior.

Solution

This problem has been fixed for 7.1i sp3, which is scheduled to become available in late June.

AR# 21538
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article