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fabulous: convert -iopad to -noiopad, map to $__FABULOUS_[I|O|T|IO]BUF

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- with PCF support in nextpnr fabulous, `-iopad` is now the default
- supply further mapping using `-extra-plib`

Signed-off-by: Leo Moser <leomoser99@gmail.com>
This commit is contained in:
Leo Moser 2026-06-24 14:23:36 +02:00
parent c73fd4f70b
commit ec8155e040
2 changed files with 15 additions and 22 deletions
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7
techlibs/fabulous/io_map.v
View file

@ -1,7 +0,0 @@
module \$__FABULOUS_IBUF (input PAD, output O);
IO_1_bidirectional_frame_config_pass _TECHMAP_REPLACE_ (.PAD(PAD), .O(O), .T(1'b1));
endmodule
module \$__FABULOUS_OBUF (output PAD, input I);
IO_1_bidirectional_frame_config_pass _TECHMAP_REPLACE_ (.PAD(PAD), .I(I), .T(1'b0));
endmodule

30
techlibs/fabulous/synth_fabulous.cc
View file

@ -80,9 +80,9 @@ struct SynthPass : public ScriptPass
log(" -carry <none|ha>\n");
log(" carry mapping style (none, half-adders, ...) default=none\n");
log("\n");
log(" -iopad\n");
log(" enable automatic insertion of IO buffers (otherwise a wrapper\n");
log(" with manually inserted and constrained IO should be used.)\n");
log(" -noiopad\n");
log(" disable I/O buffer insertion (useful for hierarchical or \n");
log(" out-of-context flows).\n");
log("\n");
log(" -noflatten\n");
log(" do not flatten design after elaboration\n");
@ -113,7 +113,7 @@ struct SynthPass : public ScriptPass
std::vector<string> extra_plib, extra_map, extra_mlibmap;
std::vector<std::pair<string, string>> extra_ffs;
bool autotop, noalumacc, nofsm, noshare, iopad, flatten;
bool autotop, noalumacc, nofsm, noshare, noiopad, flatten;
int lut;
void clear_flags() override
@ -124,7 +124,7 @@ struct SynthPass : public ScriptPass
noalumacc = false;
nofsm = false;
noshare = false;
iopad = false;
noiopad = false;
carry_mode = "none";
flatten = true;
json_file = "";
@ -208,8 +208,8 @@ struct SynthPass : public ScriptPass
memory_opts += " -no-rw-check";
continue;
}
if (args[argidx] == "-iopad") {
iopad = true;
if (args[argidx] == "-noiopad") {
noiopad = true;
continue;
}
if (args[argidx] == "-carry" && argidx+1 < args.size()) {
@ -317,14 +317,13 @@ struct SynthPass : public ScriptPass
run("opt -fast");
}
if (check_label("map_iopad", "(if -iopad)")) {
if (iopad || help_mode) {
run("opt -full");
run("iopadmap -bits -outpad $__FABULOUS_OBUF I:PAD -inpad $__FABULOUS_IBUF O:PAD "
"-toutpad IO_1_bidirectional_frame_config_pass ~T:I:PAD "
"-tinoutpad IO_1_bidirectional_frame_config_pass ~T:O:I:PAD A:top", "(skip if '-noiopad')");
run("techmap -map +/fabulous/io_map.v");
}
if (check_label("map_iopad", "(skip if -noiopad)") && !noiopad) {
run("opt -full");
run("iopadmap -bits "
"-inpad $__FABULOUS_IBUF OUT:PAD "
"-outpad $__FABULOUS_OBUF IN:PAD "
"-toutpad $__FABULOUS_TBUF EN:IN:PAD "
"-tinoutpad $__FABULOUS_IOBUF EN:OUT:IN:PAD");
}
@ -349,6 +348,7 @@ struct SynthPass : public ScriptPass
map_str += stringf(" -map %s", map);
run(map_str);
}
run("simplemap");
run("clean");
}