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AR# 14458

Virtex-II/-II Pro Configuration - BUSY asserts during SelectMAP configuration with a DES encrypted bitstream

Description

When I perform a SelectMAP configuration with an encrypted bitstream, BUSY asserts at a lower speed than the 66 MHz specification. What is the reason for this?

Solution

Extra processing time is needed when the bitstream is encrypted. Consequently, BUSY handshaking is required for encrypted bitstreams at a lower speed than for non-encrypted bitstreams. 

 

The maximum speed at which a Virtex-II/-II Pro device can be configured via SelectMAP without BUSY handshaking is 5 MHz.

AR# 14458
Date Created 08/29/2007
Last Updated 05/14/2014
Status Archive
Type General Article