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AR# 22024

Embedded Tri-mode Ethernet MAC Wrapper v3.1 - Sometimes PAR is unable to route all Virtex-4 EMAC clocks

Description

General Description: 

When I use the Embedded Tri-mode Ethernet MAC Wrapper v3.1 with the environment variable, mentioned in (Xilinx Answer 21402), PAR is sometimes unable to route some of the clock signals. Specifically, the problem is more frequent when numerous BUFGs are used.

Solution

This is a PAR issue that will be resolved in ISE 8.1. 

 

You can try working around this issue by placing non-EMAC clocks into regions other than the regions that the EMAC resides in.

AR# 22024
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article