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| author | Marcelina Kościelnicka <mwk@0x04.net> | 2020-07-06 22:52:05 +0200 |
|---|---|---|
| committer | Marcelina Kościelnicka <mwk@0x04.net> | 2020-07-09 18:11:32 +0200 |
| commit | e9c2c1b7175604acd4285800c441c4bd1d676f9d (patch) | |
| tree | df38b8d83094977f6adff764cfd166210da639ad /tests/techmap | |
| parent | 000fd08198487cd1d36e65e4470f4b0269c23a2b (diff) | |
| download | yosys-e9c2c1b7175604acd4285800c441c4bd1d676f9d.tar.gz yosys-e9c2c1b7175604acd4285800c441c4bd1d676f9d.tar.bz2 yosys-e9c2c1b7175604acd4285800c441c4bd1d676f9d.zip | |
dfflegalize: Add special support for const-D latches.
Those can be created by `opt_dff` when optimizing `$adff` with const
clock, or with D == Q. Make dfflegalize do the opposite transform
when such dlatches would be otherwise unimplementable.
Diffstat (limited to 'tests/techmap')
| -rw-r--r-- | tests/techmap/dfflegalize_dlatch_const.ys | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/tests/techmap/dfflegalize_dlatch_const.ys b/tests/techmap/dfflegalize_dlatch_const.ys new file mode 100644 index 000000000..0b5167a06 --- /dev/null +++ b/tests/techmap/dfflegalize_dlatch_const.ys @@ -0,0 +1,53 @@ +read_verilog -icells <<EOT + +module dlatch(input E, D, (* init = 8'hf0 *) output [7:0] Q); +$_DLATCH_P_ ff0 (.E(E), .D(1'b0), .Q(Q[0])); +$_DLATCH_N_ ff1 (.E(E), .D(1'b0), .Q(Q[1])); +$_DLATCH_P_ ff2 (.E(E), .D(1'b1), .Q(Q[2])); +$_DLATCH_N_ ff3 (.E(E), .D(1'b1), .Q(Q[3])); +$_DLATCH_P_ ff4 (.E(E), .D(1'b0), .Q(Q[4])); +$_DLATCH_N_ ff5 (.E(E), .D(1'b0), .Q(Q[5])); +$_DLATCH_P_ ff6 (.E(E), .D(1'b1), .Q(Q[6])); +$_DLATCH_N_ ff7 (.E(E), .D(1'b1), .Q(Q[7])); +endmodule + +EOT + +design -save orig +equiv_opt -assert -multiclock -map +/simcells.v dfflegalize -cell $_DFF_PP0_ 01 +equiv_opt -assert -multiclock -map +/simcells.v dfflegalize -cell $_DFF_PP?_ 0 +equiv_opt -assert -multiclock -map +/simcells.v dfflegalize -cell $_DFFSRE_PPPP_ 0 +equiv_opt -assert -multiclock -map +/simcells.v dfflegalize -cell $_DFFSRE_PPPP_ 1 + +# Convert everything to ADFFs. + +design -load orig +dfflegalize -cell $_DFF_PP0_ 01 + +select -assert-count 12 t:$_NOT_ +select -assert-count 8 t:$_DFF_PP0_ +select -assert-none t:$_DFF_PP0_ t:$_NOT_ %% %n t:* %i + +design -load orig +dfflegalize -cell $_DFF_PP?_ 0 + +select -assert-count 12 t:$_NOT_ +select -assert-count 4 t:$_DFF_PP0_ +select -assert-count 4 t:$_DFF_PP1_ +select -assert-none t:$_DFF_PP0_ t:$_DFF_PP1_ t:$_NOT_ %% %n t:* %i + +# Convert everything to DFFSREs. + +design -load orig +dfflegalize -cell $_DFFSRE_PPPP_ 0 + +select -assert-count 12 t:$_NOT_ +select -assert-count 8 t:$_DFFSRE_PPPP_ +select -assert-none t:$_DFFSRE_PPPP_ t:$_NOT_ %% %n t:* %i + +design -load orig +dfflegalize -cell $_DFFSRE_PPPP_ 1 + +select -assert-count 12 t:$_NOT_ +select -assert-count 8 t:$_DFFSRE_PPPP_ +select -assert-none t:$_DFFSRE_PPPP_ t:$_NOT_ %% %n t:* %i |