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| author | Eddie Hung <eddie@fpgeh.com> | 2020-05-18 08:06:50 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-18 08:06:50 -0700 |
| commit | 2d573a0ff680eb9f38358943fbf134f765ba1451 (patch) | |
| tree | f68589c127fcb0972636699b888252972ed63385 /techlibs/common/abc9_model.v | |
| parent | fa8cb3e35da68ceb55a9147bc1faacf68ad8bbfa (diff) | |
| parent | 67fc0c3698693f049e805211c49d6219f17d7c7d (diff) | |
| download | yosys-2d573a0ff680eb9f38358943fbf134f765ba1451.tar.gz yosys-2d573a0ff680eb9f38358943fbf134f765ba1451.tar.bz2 yosys-2d573a0ff680eb9f38358943fbf134f765ba1451.zip | |
Merge pull request #1926 from YosysHQ/eddie/abc9_auto_dff
abc9: support seq synthesis when module has (* abc9_flop *) and bypass non-combinatorial (* abc9_box *)
Diffstat (limited to 'techlibs/common/abc9_model.v')
| -rw-r--r-- | techlibs/common/abc9_model.v | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/techlibs/common/abc9_model.v b/techlibs/common/abc9_model.v index c0c5dc2fd..4fee60f75 100644 --- a/techlibs/common/abc9_model.v +++ b/techlibs/common/abc9_model.v @@ -1,10 +1,25 @@ -module \$__ABC9_FF_ (input D, output Q); -endmodule - (* abc9_box *) -module \$__ABC9_DELAY (input I, output O); +module $__ABC9_DELAY (input I, output O); parameter DELAY = 0; specify (I => O) = DELAY; endspecify endmodule + +(* abc9_flop, abc9_box, lib_whitebox *) +module $__DFF_N__$abc9_flop (input C, D, Q, output n1); + assign n1 = D; + specify + $setup(D, posedge C, 0); + (posedge C => (n1:D)) = 0; + endspecify +endmodule + +(* abc9_flop, abc9_box, lib_whitebox *) +module $__DFF_P__$abc9_flop (input C, D, Q, output n1); + assign n1 = D; + specify + $setup(D, posedge C, 0); + (posedge C => (n1:D)) = 0; + endspecify +endmodule |