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Altera_Forum
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16 years ago

Urgent: cant program Cyclone III design

I have an FPGA based project that I have recently completed on my DE1 board, and as such I'm moving onto developing the final board. As an intermediate step I have developed a small breakout board fo...
Altera_Forum's avatar
Altera_Forum
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16 years ago

You should try to put a scope on the jtag signal to check what they look like.

Check also that the exposed pad is well connected to ground.

While I don't see anything really wrong with your schematic, it is dangerous to directly connect the USB blaster to the Cyclone III at 3.3V without any protection. The probability of destroying the JTAG part of the FPGA with overshoots can be quite high, especially since the FPGA doesn't have any clamping diodes on the FPGA pins.