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Altera_Forum
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19 years ago

Cyclone II programming problems

Hi all -- I've built a few PCBs based on Cyclone II FPGAs. Some of these boards, and especially the last, suffer from an annoying problem: When connecting the FPGA to the JTAG cable, Quart...
Altera_Forum's avatar
Altera_Forum
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18 years ago

Hello Dennis,

from your report, I guess that's a special problem related to your hardware and most likely can't be identified without examining all hardware details (supply voltages, circuitry at all pins affecting configuration). Also an assembly issue or part defect should be considered. I assume, that AS and JTAG configuration actually was using an identical compiled design (sounds obvious, but ain't necessarily so...).

However, I didn't experience a similar problem with a lot of Cyclone II designs during the last years. If it's caused by JTAG signal quality (particularly ringing TCK), as other reports suggest, this should be seen watching the respective signals.

Regards,

Frank