UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 9468

14.x Constraints - How do I use the EXCEPT command within a FROM TO constraint?

描述

How do I use the EXCEPT command within a FROM TO constraint if a few of the paths within the FROM TO TIMEGRPs must be excluded?

解决方案

For the FROM TO constraint, two TIMEGRPs must be created: one for the destination elements and one for the source elements. To exclude a signal(s) from either theTIMEGRP for the FROM TO constraint, you can use an EXCEPT command.

For example, the syntax would look like the following:

  • TIMEGRP new_srcgrp = srcgrp EXCEPT sig1;
  • TIMEGRP new_destgrp = dest_grp EXCEPT sig2;

If you must apply a FROM TO TIG constraint, make sure that the TIMESPEC line contains the TIG notifier as follows:

TIMESPEC "TS_constraintA" = FROM "new_srcgrp" TO "new_destgrp" TIG;

Additional Information

AR# 9468
日期 12/15/2012
状态 Active
Type 综合文章
Tools
  • ISE - 10.1
  • ISE Design Suite - 11.1
  • ISE Design Suite - 11.2
  • More
  • ISE Design Suite - 11.3
  • ISE Design Suite - 11.4
  • ISE Design Suite - 11.5
  • ISE Design Suite - 12.1
  • ISE Design Suite - 12.2
  • ISE Design Suite - 12.3
  • ISE Design Suite - 12.4
  • ISE Design Suite - 13
  • ISE Design Suite - 13.1
  • ISE Design Suite - 13.2
  • ISE Design Suite - 13.3
  • ISE Design Suite - 13.4
  • ISE Design Suite - 14.1
  • Less
的页面