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AR# 23476

10.1 Floorplanner - Virtex/-E, Spartan-II/-IIE AREA_GROUP name does not match between Instances and Range

Description

Floorplanner was used to create an AREA_GROUP for some of the logic in my design. When I look at the UCF constraints generated by Floorplanner, the AREA_GROUP name for the instances do not match the AREA_GROUP name for the range similar to the example below.  

 

Example constraint from UCF: 

 

AREA_GROUP "AG_GRP0" RANGE = CLB_R1C4:CLB_R2C5 ; 

INST "counter2/COUNT_3" AREA_GROUP = "GRP0" ; 

INST "counter2/COUNT_2" AREA_GROUP = "GRP0" ; 

INST "counter2/COUNT_1" AREA_GROUP = "GRP0" ; 

INST "counter2/COUNT_0" AREA_GROUP = "GRP0" ;

Solution

To work around this issue, edit the text of the ".ucf" to make the AREA_GROUPs match. The correct example is below. 

 

Corrected sample constraint from ".ucf": 

 

AREA_GROUP "AG_GRP0" RANGE = CLB_R1C4:CLB_R2C5 ; 

INST "counter2/COUNT_3" AREA_GROUP = "AG_GRP0" ; 

INST "counter2/COUNT_2" AREA_GROUP = "AG_GRP0" ; 

INST "counter2/COUNT_1" AREA_GROUP = "AG_GRP0" ;

AR# 23476
Date Created 09/04/2007
Last Updated 05/20/2014
Status Archive
Type General Article