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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/nexus/cells_map.v
View file

@ -53,14 +53,6 @@ module \$_DFFE_PP1P_ (input D, C, E, R, output Q); \$__FF_ASYNCLSR #(1) _TECHM
module \$_SDFFE_PP0P_ (input D, C, E, R, output Q); \$__FF_SYNCLSR #(0) _TECHMAP_REPLACE_ (.D(D), .C(C), .R(R), .E(E), .Q(Q)); endmodule
module \$_SDFFE_PP1P_ (input D, C, E, R, output Q); \$__FF_SYNCLSR #(1) _TECHMAP_REPLACE_ (.D(D), .C(C), .R(R), .E(E), .Q(Q)); endmodule
module \$__NX_TINOUTPAD (input I, OE, output O, inout B);
BB _TECHMAP_REPLACE_ (.I(I), .O(O), .T(~OE), .B(B));
endmodule
module \$__NX_TOUTPAD (input I, OE, output O);
OBZ _TECHMAP_REPLACE_ (.I(I), .T(~OE), .O(O));
endmodule
`ifndef NO_LUT
module \$lut (A, Y);
parameter WIDTH = 0;

2
techlibs/nexus/synth_nexus.cc
View file

@ -333,7 +333,7 @@ struct SynthNexusPass : public ScriptPass
else
run("techmap -map +/techmap.v -map +/nexus/arith_map.v");
if (help_mode || !noiopad)
run("iopadmap -bits -outpad OB I:O -inpad IB O:I -toutpad $__NX_TOUTPAD OE:I:O -tinoutpad $__NX_TINOUTPAD OE:O:I:B A:top", "(skip if '-noiopad')");
run("iopadmap -bits -outpad OB I:O -inpad IB O:I -toutpad OBZ ~T:I:O -tinoutpad BB ~T:O:I:B A:top", "(skip if '-noiopad')");
run("opt -fast");
if (retime || help_mode)
run("abc -dff -D 1", "(only if -retime)");