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I'm pretty sure "DONE" needs to be asserted for a single clock only.
The NIOS is probably hanging prior to issuing the next instruction because it's waiting for "DONE" to be de-asserted?
I don't think you have to do anything special with "RESULT" when you clear the "DONE" bit (it can keep it's old contents).
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Thank you for your answer.
Where state = 2 I assign result and DONE <= '1'.
Where state = 3 you can see DONE <= 'U', but the original code was DONE <= '0': the deassertion was realized there.
In this way, DONE is asserted for one clock cycle. But the result was exactly the same.
The c.i. call hang.
Honored Contributor
