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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

As far as I understand, disabling JTAG pins is possibly with MAX CPLDs, but strictly one-way. After that, you can't reprogram the device with a standard JTAG programmer, a special high voltage pin function (e.g. available with a Altera Programming Unit) is required to reenable JTAG.