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Altera_Forum's avatar
Altera_Forum
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15 years ago

JTAG and/or IO pin usage

Hello all, I'm new to CPLDs but I'm very keen on getting a little project up and running soon. The basic question is: is it possible to program a EPM3064 through the JTAG pins, then use th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Thanks Dave for the notes.

That's a little confusing for me (note 1 in the altera doc, I can only guess that 'configured for isp' means entering the programming mode). I'll just treat the JTAG port as if it's always a JTAG port then, and double-up the JTAG connections to spare IO (which I have heaps of) and be done with it - easy!

PS, no I don't want to reuse the header - in fact I want to get rid of the header & connect some uC IO to the CPLD with the same uC IO doing JTAG-y stuff as well as mode selection for my user code.

I think I'm sorted now though.

Cheers,

Doug.