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wernermisc/m1/tools/xdlfixes

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#!/usr/bin/perl
#
# xdlfixes - Pro-process a Xilinx .xdl file such that xdl -xdl2ncd accepts it
#
# Written 2011 by Werner Almesberger
# Copyright 2011 by Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
sub usage
{
print STDERR "usage: $0 [infile]\n";
exit(1);
}
&usage if $ARGV[0] =~ /^-/;
while (<>) {
#
# BUG: identifiers containing commas are generated by xdl -ncd2xdl
# but cannot be parsed by xdl -xdl2ncd. We therefore replace all the
# commas in identifiers with underscores.
#
$t = $_;
$s = "";
while ($t =~ /[^\\]"\S+"/) {
$s .= $`;
($q = $&) =~ y/,/_/;
$t = $';
$s .= $q;
}
$s .= $t;
#
# BUG: xdl -xdl2ncd does not seem to understand that inputs are not
# outputs. We have two choices here: define the output standard as
# "#OFF" or define it as "LVCMOS33".
#
# With "LVCMOS33", xdl will also insist on the slew rate and the drive
# strength.
#
# In any case, we end up with something the DRC of bitgen will reject.
# Luckily, bitgen has the option -d to turn off the DRC. It then
# cheerfully announces
#
# ERROR:Bitgen - Could not find programming information for I/O
# standard #OFF [...]
# The programming of the output buffers will not be correct.
#
# but the resulting mess appears to work regardless.
#
if ($_ =~ /^inst /) {
$s = $_;
while (!/;\s*$/) {
$_ = <>;
$s .= $_;
}
# $s =~ s/\bISTANDARD::LVCMOS33\b/$& OSTANDARD::LVCMOS33/;
# $s =~ s/\bISTANDARD::LVCMOS33\b/$& OSTANDARD::#OFF/;
$s =~ s/\bISTANDARD::LVCMOS33\b/$& OSTANDARD::#OFF/ unless
$s =~ /\bOSTANDARD:/;
# $s =~ s/\bINBUF:/OUTBUF::#OFF $&/;
# if ($s =~ /\bISTANDARD::LVCMOS33\b/) {
# $s =~ s/\bSLEW::#OFF\b/SLEW::SLOW/g;
# $s =~ s/\bDRIVEATTRBOX::#OFF\b/DRIVEATTRBOX::12/g;
# }
}
print $s || die "write: $!";
}