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AR# 12521

*Obsolete* 4.1i Virtex-II BitGen - "BitGen:218" warning message is issued when XIL_BITGEN_VIRTEX2ES is set


Keyword: Virtex-II, BitGen, XIL_BITGEN_VIRTEX2ES

Urgency: Standard

General Description:
When I set the XIL_BITGEN_VIRTEX2ES environment variable, the following warning message appears:

"WARNING:BitGen:218 - The environment variable "XIL_BITGEN_VIRTEX2ES" is set.
This will create a bit stream for a Virtex-II engineering sample device. DRC will verify that all BUFGMUX components which source a signal driving a DCM are placed in the same quadrant of the device as the DCM. The Triple DES bit stream encryption and partial reconfiguration features are not compatible with standard bit stream generation. Please consult the Answers Database and other online resources at http://support.xilinx.com to locate more information on this message."


Virtex-II ES parts require additional frame writes to the device that insure all memory cells are programmed correctly. This will make the bitstream approximately 10% larger; due to this redundancy, neither bitstream encryption nor partial reconfiguration are possible.
AR# 12521
Date 09/22/2005
Status Archive
Type ??????