Fix bug where FSM may cause inferred latch #390
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Description & Motivation
Even though the FSM should never allow the case statement to reach an invalid state, synthesis tools may still infer a latch for receivers in the actions which are not assigned in the
default
case. This PR fixes this issue by zeroing out all receivers mentioned in any actions in thedefault
, even though it should never happen.Related Issue(s)
N/A
Testing
Added a test that the zero-out happens.
Backwards-compatibility
No
Documentation
No