Answers Database

M1.x: How to preserve the pinout of a previous PAR run (pad2ucf)


Record #3534

Problem Title:
M1.x: How to preserve the pinout of a previous PAR run (pad2ucf)


Problem Description:
Keywords: pad2ucf, pinout, LOC

Urgency: standard


How does one keep the same pinout between PAR runs, if the
original UCF does not contain a LOC for every PAD?


Solution 1:

You can use the PERL script "pad2ucf", available at:

ftp://ftp.xilinx.com/pub/utilities/M1_workstation/pad2ucf.tar.Z

or

ftp://ftp.xilinx.com/pub/utilities/M1_pc/pad2ucf.zip


This script will take the .pad report produced by PAR and
recreate the equivalent UCF constraints that would have
LOC'd the signals to the desired pads. The UCF may then be
used for subsequent PAR runs.
One note: this script assumes the name of the signal in the
UCF is the name of the IOB reported in the .pad. This
assumption should always be true, provided that a BLKNM
or HBLKNM was not placed on the pad.




End of Record #3534