Answers Database

How to ignore/remove LOC constraints on PADS?


Record #2898

Product Family:  Software

Product Line:  Merged Core

Problem Title:
How to ignore/remove LOC constraints on PADS?


Problem Description:
Keywords: LOC, constraints, PADS, ignore, 18471

Urgency: Standard

General Description:

LOC constraints defined in schematics are automatically passed to PAR by the
mapper, using the .pcf file.


Solution 1:

LOC constraints passed from the schematic can be modified or ignored
using the following options.

1. If ngdbuild is run with the "-r" switch, all location constraints
   will be ignored. When using DM/FE, this switch can be added to the
   flow by using the Template Manager to define a custom template.

2. The .pcf file can be modified with a text editor between mapping and PAR.

3. Location constraints can be modified by editing the design in EPIC. Select
   and attibute individual components to modify their constraints. EPIC will
   write the changes to the .pcf file when a save is performed.



End of Record #2898