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Signal tap does not want you to derive a signal with combinatorial logic and call that a clock. That would messes up the timing.
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Thanks, Randall for this pointer. I found out I could use CLOCK_50 ~ 50MHz for the acquisition clock... I owe my ST knowledge to you!
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Gsynth, in your code --- I broke the chain and unclocked it to see the propagation delay through the chain. you are right, apart from the first LCELL which has a considerable propagation delay (don't know why), the remaining transitions happen really fast....
I tried it on chip with Signal Tap [I know how it works now, yaay] and the transitions seem to happen almost simultaneously. I wonder where my delay is going to come from, at this rate. :(
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