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iopadmap: Add native support for negative-polarity output enable.

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This commit is contained in:
Marcelina Kościelnicka 2021-11-09 11:22:48 +01:00
parent 4871d8f199
commit 15b0d717ed
12 changed files with 35 additions and 43 deletions
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8
techlibs/xilinx/cells_map.v
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@ -359,11 +359,3 @@ 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

5
techlibs/xilinx/synth_xilinx.cc
View file

@ -558,9 +558,10 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("map_cells")) {
// Needs to be done before logic optimization, so that inverters (OE vs T) are handled.
// Needs to be done before logic optimization, so that inverters (inserted
// here because of negative-polarity output enable) are handled.
if (help_mode || !noiopad)
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", "(skip if '-noiopad')");
run("iopadmap -bits -outpad OBUF I:O -inpad IBUF O:I -toutpad OBUFT ~T:I:O -tinoutpad IOBUF ~T:O:I:IO A:top", "(skip if '-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);