mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-11-04 05:19:11 +00:00
Code Activity

dfflegalize: Prefer mapping dff to sdff before adff

Browse source 
This ensures that, when both sync and async FFs are available and abc9
is involved, the sync FFs will be used, and will thus remain available
for sequential synthesis.
This commit is contained in:
Marcelina Kościelnicka 2020-07-05 04:57:24 +02:00
parent 7afcb72c98
commit f3f55ae7c2
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
passes/techmap/dfflegalize.cc
View file

@ -364,7 +364,7 @@ flip_dqi:
// Some DFF is supported with this init val. Just pick a type.
if (ff_type == FF_DFF) {
// Try adding a set or reset pin.
for (auto new_type: {FF_ADFF0, FF_ADFF1, FF_SDFF0, FF_SDFF1})
for (auto new_type: {FF_SDFF0, FF_SDFF1, FF_ADFF0, FF_ADFF1})
if (supported_cells[new_type] & initmask) {
ff_type = new_type;
sig_r = State::S0;