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# 11127

4.1i Constraints - Is it possible to declare multiple constraints for a single net using only one UCF line?

Description

General Description:

Is it possible to declare multiple constraints for a single net using only one UCF line?

Solution

There is no provision in the 4.1i software that allows the declaration of multiple constraints on a single net using a single UCF line. Each constraint must be declared individually, even for the same net.

The 5.1i software, which is due to be released in September of 2002, will support the declaration of multiple constraint on a single line. The syntax is supported on NET, INST, and PIN constraints.

The following is an example of the new syntax:

NET myNet LOC = P54 | IOSTANDARD = LVPECL | SLEW = FAST ;

AR# 11127
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article