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Try chaining small counters together.
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To get to 17-bit equivalent with 8-bit counters, I'd need 512 of them, so this isn't viable.
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I've realised that carry lookahead won't work in the same way as on a 74163 because the logic is ram lookup and therefore any input change could cause a glitch defeating the lookaheads purpose of a longer setting time.
My current thought is to divide the 250MHz clock by 4 (synced at 250MHz to the trigger input) and use this 62.5MHz clock to do 15-bits of the delay plus about three-bits of 250MHz delay.
Is it possible to connect an internally generated signal to a global clock line? If so how?
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