leo@leobodnar.com said: > Now, what would be recognised procedure for sweeping external input pulse > delay over few hundred ns in a controlled, measurable and repeatable way? How about using another crystal at a slightly different frequency? Suppose you start with 10.000001 MHz and divide by 10000000. That will slowly sweep a pulse. All you have to do is reset the counter at the right time to get it started at the right phase. I think you can do something similar with a DDS type generator starting from an arbitrary frequency. It won't sweep in a simple ramp but will be a sawtooth pattern where the points on each tooth are at slightly different offsets that will fill in the whole space if you merge them together. -- These are my opinions. I hate spam.