AR# 5353

M1.5: Constraint Editor: If period constraint comes in from NGD file, not UCF file, it can't be deleted or Edited.

Description

General Description: If the NGD that has a PERIOD defined, but the

UCF doesn't, it can not be deleted or changed in the Constraint Editor.

If a new PERIOD constraint is created in CE the group is added to

the ucf but not the new PERIOD Timespec.

Solution

To resolve this issue open the UCF file in a text editor and add the desired

constraint. For Example:

TIMESPEC "TS_CLK" = PERIOD "CLK" 20 ns;

AR# 5353
Date 01/18/2010
Status Archive
Type General Article