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Altera_Forum
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17 years ago

Cyclone III and JTAG programming problem

Hi everybody, I have a problem concerning programming my Cyclone III device. I have a original USB Blaster cable which for sure works fine. The problem is that when I try to use it, Quartus respon...
Altera_Forum's avatar
Altera_Forum
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17 years ago

Apart from incorrect connected JTAG interface, the most popular design faults with Cyclone III are:

- missing GND connection of exposed pad with EQFP144 package

- missing 2.5V supply for VCCA

Basically, the JTAG interface is kept in reset, until VCCINT and VCCA reach a minimum level. Also the exposed pad's GND connection is required for operation.