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xilinx: Add tristate buffer mapping. (#1528) 

Fixes #1225.
This commit is contained in:
Marcin Kościelnicki 2019-12-04 09:44:00 +01:00 committed by GitHub
parent 2abe38e73e
commit fcce94010f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 16 additions and 9 deletions
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8
techlibs/xilinx/cells_map.v
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@ -363,3 +363,11 @@ module \$__XILINX_MUXF78 (O, I0, I1, I2, I3, S0, S1);
else
MUXF8 mux8 (.I0(T0), .I1(T1), .S(S1), .O(O));
endmodule
module \$__XILINX_TINOUTPAD (input I, OE, output O, inout IO);
IOBUF _TECHMAP_REPLACE_ (.I(I), .O(O), .T(~OE), .IO(IO));
endmodule
module \$__XILINX_TOUTPAD (input I, OE, output O);
OBUFT _TECHMAP_REPLACE_ (.I(I), .O(O), .T(~OE));
endmodule

17
techlibs/xilinx/synth_xilinx.cc
View File

@ -282,6 +282,7 @@ struct SynthXilinxPass : public ScriptPass
void script() YS_OVERRIDE
{
bool do_iopad = iopad || (ise && !noiopad);
std::string ff_map_file;
if (help_mode)
ff_map_file = "+/xilinx/{family}_ff_map.v";
@ -305,6 +306,8 @@ struct SynthXilinxPass : public ScriptPass
run("proc");
if (flatten || help_mode)
run("flatten", "(with '-flatten')");
run("tribuf -logic");
run("deminout");
run("opt_expr");
run("opt_clean");
run("check");
@ -503,6 +506,9 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("map_cells")) {
// Needs to be done before logic optimization, so that inverters (OE vs T) are handled.
if (help_mode || do_iopad)
run("iopadmap -bits -outpad OBUF I:O -inpad IBUF O:I -toutpad $__XILINX_TOUTPAD OE:I:O -tinoutpad $__XILINX_TINOUTPAD OE:O:I:IO A:top", "(only if '-iopad' or '-ise' and not '-noiopad')");
std::string techmap_args = "-map +/techmap.v -map +/xilinx/cells_map.v";
if (widemux > 0)
techmap_args += stringf(" -D MIN_MUX_INPUTS=%d", widemux);
@ -561,15 +567,8 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("finalize")) {
bool do_iopad = iopad || (ise && !noiopad);
if (help_mode || !noclkbuf) {
if (help_mode || do_iopad)
run("clkbufmap -buf BUFG O:I -inpad IBUFG O:I", "(skip if '-noclkbuf', '-inpad' passed if '-iopad' or '-ise' and not '-noiopad')");
else
run("clkbufmap -buf BUFG O:I");
}
if (help_mode || do_iopad)
run("iopadmap -bits -outpad OBUF I:O -inpad IBUF O:I A:top", "(only if '-iopad' or '-ise' and not '-noiopad')");
if (help_mode || !noclkbuf)
run("clkbufmap -buf BUFG O:I ", "(skip if '-noclkbuf')");
if (help_mode || ise)
run("extractinv -inv INV O:I", "(only if '-ise')");
}