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