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Altera_Forum's avatar
Altera_Forum
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8 years ago

Using SignalTap to capture high rate clocks?

Hello, I would to know how accurate SignalTap is when capturing signals such as an 80-Mhz clock from a pll that is used to drive logic? When I view such a signal I see a non 50-percent duty cycle clo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Is there a reason why you need to see the clock in SignalTap? Remember, it's best if your sampling clock is twice the frequency of what you're monitoring. So with an 80 MHz sampling clock used to look at an 80 MHz clock, it may miss edges, which is what you are seeing.