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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

Hi wombat & FvM,

Thanks for the replies. If JTAG can't be reenabled easily I won't bother disabling it.

Ok, I'll try with GCLRn & TCK tied together; so whenever I want to reset my CPLD I'll pull TMS high and clock TCK until the TAP's in test-logic-reset and the all my registers have been cleared. The I presumably have TMS/TDI/TDO available for inputs? I might connect TMS/TDI/TDO to some other IO points initially in case they're not available.

Thanks again,

Regards,

Doug.