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AR# 15705

5.1i Floorplanner - The "Group" function for area group constraints does not work, resulting in "ERROR:NgdBuild:753..."

Description

Keywords: Floorplanner, group, area group, error, NGDBuild, 753, translate

Urgency: Standard

General Description:
When I use Floorplanner to group logics in a hierarchy window and assign AREA_GROUP constraints to a user-defined group, re-implementation of the design causes NGDBuild to report the following error messages:

"ERROR:NgdBuild:753 - Line XX in 'tester.ucf': Could not find instance(s) 'XXX' in the design. To suppress this error specify the correct instance name or remove the constraint."
"ERROR:Parsers:11 - Encountered unrecognized constraint while parsing."
"ERROR:NgdBuild:19 - Errors found while parsing constraint file "tester.ucf"."

Solution

To work around this problem, manually modify the UCF to assign components to the area group.

For example:

Constraints written out by Floorplanner

AREA_GROUP "GRP0" RANGE = CLB_R1C1:CLB_R9C8
INST "GRP0" AREA_GROUP = "GROUP0";

User-modified constraints

AREA_GROUP "GRP0" RANGE = CLB_R1C1:CLB_R9C8 ;
INST "write_allow" AREA_GROUP = "GRP0" ;
INST "write_addr_8" AREA_GROUP = "GRP0" ;
INST "write_addr_7" AREA_GROUP = "GRP0" ;

This problem is fixed in the latest 5.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates
The first service pack containing the fix is 5.1i Service Pack 3.
AR# 15705
Date Created 09/27/2002
Last Updated 03/06/2005
Status Archive
Type General Article