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Altera_Forum
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13 years ago

JTAG Chain problem - no device detected (Tried with multiple boards)

Hi everyone, I'm doing some work with custom cyclone III boards and am in the process of trying to program the device using a JTAG port and a USB Blaster cable. The boards were used last yea...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

We have access to a scope, but I'm having

difficulties trying to probe, we've located the

TDI pin on the cyclone III but we are not able

to run any JTAG test, programming attempts

long enough to be able to test for any signals.

Any test we run (JTAG chain integrity test,

IDCODE iteration test until stop) terminates

within seconds of starting.

Any help measuring the signals would be

appreciated. Bear in mind I'm a university student

and have little experience probing complex circuits.

Thanks,

Mat.