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-rw-r--r--passes/techmap/dfflibmap.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/passes/techmap/dfflibmap.cc b/passes/techmap/dfflibmap.cc
index b0318a0b3..9f534c2ea 100644
--- a/passes/techmap/dfflibmap.cc
+++ b/passes/techmap/dfflibmap.cc
@@ -118,6 +118,10 @@ static void find_cell(LibertyAst *ast, std::string cell_type, bool clkpol, bool
if (cell->id != "cell" || cell->args.size() != 1)
continue;
+ LibertyAst *dn = cell->find("dont_use");
+ if (dn != NULL && dn->value == "true")
+ continue;
+
LibertyAst *ff = cell->find("ff");
if (ff == NULL)
continue;