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Altera_Forum
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16 years ago

Cyclone III vs USB Blaster Rev. B

I have had various intermittent failures when programming the Cyclone III (EP3C10F256C8) using Quartus II and Nios II ver 8.0, 9.0, and 9.1, two different computers, and two different USB Blasters (R...
Altera_Forum's avatar
Altera_Forum
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16 years ago

If it's a custom board, I would expect a JTAG hardware problem, e.g. TCK overshoot/ringing edge, presence of interfering signals, too high resistance TCK pull-down resistor. The different USB Blaster models have different driver hardware and behave partly different.