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AR# 14933

4.2isp3 Virtex-II ES, BitGen - "WARNING:Bitgen - Setting bitgen -g Security:Level2 will minimize the size of the bit stream."

Description

Keywords: 4.2isp2, 4.2isp3, Bitgen, Security:Level2, Security, Virtex-II ES

Urgency: Standard

General Description:
When I run BitGen with 4.2i Service Pack 2 or newer software on Virtex-II ES devices, the following warning is reported when the stepping constraint is set to 0 (STEPPING=0) for ES devices and the security level is set to Level 2:

"WARNING:Bitgen - Setting bitgen -g Security:Level2 will minimize the size of the bit stream. System environment during configuration must be carefully managed when using this bit stream. Please contact your FAE for additional information."

Solution

When the security level is set to Level 2 and the stepping constraint is set to STEPPING=0 for Virtex-II ES devices, this warning message appears because the device becomes active immediately as it is being configured. This situation can potentially cause internal contention since one part of the chip will become active before another has been configured. This contention will not damage the chip but could cause invalid outputs until the startup sequence is completed.
AR# 14933
Date Created 06/20/2002
Last Updated 01/19/2004
Status Archive
Type General Article