diff options
Diffstat (limited to 'passes')
| -rw-r--r-- | passes/fsm/fsm_extract.cc | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/passes/fsm/fsm_extract.cc b/passes/fsm/fsm_extract.cc index 7533b4a3..ebe3073d 100644 --- a/passes/fsm/fsm_extract.cc +++ b/passes/fsm/fsm_extract.cc @@ -231,6 +231,10 @@ static void extract_fsm(RTLIL::Wire *wire) log(" fsm extraction failed: state selection tree is not closed.\n"); return; } + if (SIZE(states) <= 1) { + log(" fsm extraction failed: at least two states are required.\n"); + return; + } // find control outputs // (add the state signals to the list of control outputs. if everything goes right, this signals |