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AR# 23036

8.1i PAR - How do I constrain the placement of clock domains (or TIMEGRPs) to particular clock regions?

Description

I have heard that it is possible to constrain the placement of an entire clock domain to particular clock regions. How is that done?

NOTE: This Answer Record applies to Virtex-II and newer architectures.

Solution

This can be done by defining a TIMEGRP, assigning the TIMEGRP to an AREA_GROUP, and then assigning the AREA_GROUP to a list of Clock Regions.

The following is a sample of the UCF syntax used to assign an entire clock domain to clock regions:

NET "clk1" TNM_NET = "TNM_clk1" ;

TIMEGRP "TNM_clk1" AREA_GROUP = "AG_clk1" ;

AREA_GROUP "AG_clk1" RANGE = CLOCKREGION_X0Y4,CLOCKREGION_X0Y5,CLOCKREGION_X0Y6,CLOCKREGION_X0Y7 ;

AR# 23036
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article