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Altera_Forum
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14 years ago

SignalTap and Timing

Hello, Recently I have had a design where SignalTap ignores my triggers no matter what trigger I set. Each time I hit Run, SignalTap comes back immediately as if I had no triggers set. That d...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

I saw one desing with the JTAG signals running alongside a memory interface(it was a much slower interface than DDR, but the traces ran alongside each other for a long distance). Ended up being noise coupled onto the TCK. A pain to debug. Here's a post I did after it:

http://www.alteraforum.com/forum/showthread.php?t=687

I'm not saying that's the issue, but it is strange. Possibly try a) making your signaltap as simple as possible. b) removing the DDR from the design, if possible, and see if everything starts working. Good luck.