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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

problem programming old cpld (epm7032)

HI, I have thi problem: - old design and HW based on epm7032 (5V) - epm7032 pof file generted with maxplus vers. 9 (I hve the sources) - the design use the JTAG pin (TMS, TCK, TDI, TDO..) as...
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
3 years ago

Bad idea. Never use the JTAG pins as normal I/O. You will regret it.

If you do use them as normal I/O, you can only program a new blank device ONCE via JTAG USB Blaster.

After the first programming, you must use a third party device programmer that is non-JTAG to reprogram the device.

I suspect the device you are trying to program is not blank, but has been programmed before so that the JTAG interface is disabled.