Hi all,
I have a 4-FPGA design with nearly identical VHDL source code, so in order to speed development, I started using the command-line tools instead of the Xilinx IDE (which basically also runs the cmd line tools from the shell). I've encountered strange behavior since:
- MPPR and PAR with the same cost table generate different results on my PC (w2k, sp3, running 5.2i sp3). This is not such a big issue, as I wrote my own batch to do an MPPR by calling PAR with different cost tables values.
- PAR run from the ISE and PAR from the command line generate different results, with identical options and input files (I actually used the .cmd_log file to write my own batch file). More specifically, ISE returns result A, cmd line returns B. Strangely enough, I ran the cmdline tools on another PC, with identical settings, and this returned result A as well.
I browsed through the Xilinx answer database for clues, and I found no.
17134, describing a similar problem. A workaround is presented, but when I implement it (it involves settings the PL_NODIROPT env. variable to 1), I get yet another result, C.Has anyone encountered this problem before and was able to solve it?
Thanks in advance,
Jo Pletinckx ___________________________________________________________________________
ir. Jo Pletinckx
Ghent University Department of Information technology / INTEC-design
Sint-Pietersnieuwstraat 41 B-9000 GENT Belgium, Europe ___________________________________________________________________________