AR# 32825

11.2 Virtex-6 Route - Virtex-4 BUFR circuits are not retargeted to Virtex-6

Description

My design contains a BUFR circuit that worked fine in Virtex-4 and Virtex-5, but it no longer works in Virtex-6.

What is different between a Virtex-5 and Virtex-6 that causes the BUFR circuit to no longer work?

Solution

The difference is that Virtex-4 BUFR circuits (BUFIO driving BUFR in series) are automatically retargeted for Virtex-5 (BUFIO and BUFR in parallel and both driven by IO logic). It is Xilinx policy to only retarget across one architecture generation and so a Virtex-4 BUFR circuit is not retargeted for Virtex-6 and will not work. It is necessary to change the input design to correct the BUFR circuit.

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AR# 32825
Date	12/15/2012
Status	Active
Type	General Article
Devices	Virtex-6 CXT Virtex-6 HXT Virtex-6 LX More Virtex-6 LXT Virtex-6 SXT Less
Tools	ISE Design Suite - 11.2 ISE Design Suite - 11.3 ISE Design Suite - 11.4 More ISE Design Suite - 11.5 ISE Design Suite - 12.1 ISE Design Suite - 12.2 Less

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