I made a detailed-ish writeup on the worst bug I have ever encountered. I've been fighting it on and off for months and the only thing I was able to do is to narrow it down somewhat. Here it is:https://community.cypress.com/message/191835
I'm so sorry for your troubles, and anyone elses troubles who also encountered this bug. I've now merged the bug fix.
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yeah, it's fine, I'm mostly frustrated by my own failure to bisect it down to the toolchain by replacing the FIFO output with a counter.
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on the other hand, this was the last part of the Glasgow gateware that made me doubt whether the PCB design is good, so it's really good it's fixed now
End of conversation
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