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Altera_Forum
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16 years ago

JTAG & AS configuration

Hello community, I've a basic problem (I think for you...) in programming a serial configuration device (EPCS16 & EP2C50) using JTAG interface. I'm using the following scheme : combining JTA...
Altera_Forum's avatar
Altera_Forum
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16 years ago

The problem is pretty clear in my opinion. The question is, if the Quartus programmer is managing indirect JTAG programming in a mixed device chain correctly? I think it should, but I'm not able to check it now.

Did you already try other virtual JTAG instances, e.g. SignalTap II or Source&Probe? According to my experience, it may be the case, that basic JTAG device configuration works well, but virtual JTAG variants don't due to signal quality problems of the JTAG chain (ringing TCK).