Why does my state machine enter an illegal state? - Why does my state machine enter an illegal state? Description If your state machine has an asynchronous reset which does not meet recovery and removal timing requirements, the state machine may enter an illegal state. Resolution To avoid this problem, either fix the recovery and removal timing violations or turn on the Safe State Machine Logic option. See Quartus II Help for the Safe State Machine Logic option. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']