AR# 11917

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4.1i Virtex-II MAP - IOB (programmable) delay is incorrectly turned "On" for an IOB with a DCM-based clock.

描述

Keywords: Virtex-II, IOB, programmable, delay, on, default, DCM

Urgency: Standard

General Description:
In a Virtex-II design, the IOB delay is turned "On" by default in an IOB where a flip-flop is clocked by a DCM-based clock. (This IOB delay should not be on in this case.)

解决方案

To work around this problem, use the NODELAY attribute.

This can be done in the UCF or NCF files by using the following format:

NET RcvData* NODELAY ;
NET SelectOUT NODELAY ;

This problem is fixed in the latest 4.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates.
The first service pack containing the fix is 4.1i Service Pack 1.
AR# 11917
日期 08/20/2003
状态 Archive
Type 综合文章
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