From a94b41011d5ec9514739c52b963e0bd96890973f Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Wed, 22 Jan 2020 10:08:48 -0800 Subject: [PATCH] abc9: error out if flip-flop init is 1'b1 for '-dff' Due to ABC sequential synthesis restriction --- passes/techmap/abc9.cc | 2 ++ 1 file changed, 2 insertions(+) diff --git a/passes/techmap/abc9.cc b/passes/techmap/abc9.cc index b0e2c7697..2568a6cd1 100644 --- a/passes/techmap/abc9.cc +++ b/passes/techmap/abc9.cc @@ -1069,6 +1069,8 @@ struct Abc9Pass : public Pass { SigSpec abc9_init = assign_map(abc9_init_wire); if (!abc9_init.is_fully_const()) log_error("'%s.init' is not a constant wire present in module '%s'.\n", cell->name.c_str(), log_id(module)); + if (abc9_init == State::S1) + log_error("'%s.init' in module '%s' has value 1'b1 which is not supported by 'abc9 -dff'.\n", cell->name.c_str(), log_id(module)); r2 = cell->attributes.insert(std::make_pair(ID(abc9_init), abc9_init.as_const())); log_assert(r2.second); } -- 2.30.2