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Altera_Forum's avatar
Altera_Forum
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13 years ago

Signaltap modify actual circuit when triggered problem.

Has anyone seen a issue where, when the "Run analysis" on Signaltap is clicked, the operation of the actual design actually changed? I am using signaltap to monitor a ADPLL loop control. I have...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I would think too it could be a cross talk problem with the JTAG signals, or maybe a power supply decoupling problem? For example on the Cyclone III and IV, the VCCA supplies are used for both the PLLs and the JTAG system, IIRC.