axi_dw_downsizer: Fix i_forward_b_beats_queue
underflow
#323
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Outdated suggestions cannot be applied.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.
The
forward_b_beat_push
signal should be asserted every time the lastW
handshake in a burst occurs on the master port. However, pushing to the FIFO should also be conditional onforward_b_beat_full
not being asserted.The way this second condition was ensured allowed the
W
handshake to occur, without tracking it through a push to the queue. The correspondingB
handshake would then trigger a pop, causing an underflow in the FIFO counter.This PR corrects this behaviour, by stalling the
W
handshake until the FIFO is no longer full, so it is ensured that pushing to the FIFO is possible.