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The output vectors doesn't count properly

Question asked by rinaishlene on Jul 24, 2011

I'm trying to generate counting patterns using the pattern generator in the 16821A logic analyzer.The counting sequences works right when I'm using the internal clock (which I set to 50 MHz) but when I'm using my DE2 board clock (50 Mhz external clock) as the clock for the pattern generator,the counting sequences went erroneous. I use the 10477A 3.3V clock pod to insert the clock into the pattern generator. The board's clock is assigned to the CLK IN pin of the clock pod. Is there anything that I have skipped ( to do ) or can be done to produce the correct counting sequences when using the external clock?

Hope you guys can help.