Answers Database

PPR ignores timing constraints when invoked from the command line


Record #757

Product Family:  Software

Product Line:  FPGA Core

Problem Title:
PPR ignores timing constraints when invoked from the command line


Problem Description:
A user choosing to run the xmake flow by running the programs individually from
the command line or via a batch file may see that PPR is ignoring all timing con
straints written in the .cst file, even if that file is explicitly specified.


Solution 1:

Timing constraints are written into the .xtf file by XNFPREP.  Therefore, the "c
stfile=" option must be specified for command-line execution of XNFPREP in order
 for .cst file timing constraints to be read.



End of Record #757