Cyclone III EP3C25 - Pin 141 can't drive signal ?

Thanks for your response, Alex.

To sum up, I've cleared the following hypothesis :

- fault in VHDL : with a simple design that stuck the output at 0

- fault on the circuit / external pull-up : tried to disconnect fpga from the rest of the circuit

- fault on FPGA component itself : I have two different wired boards, the probability to have the fault on two FPGA is low

In ALL of these cases, the output remains at 1.

I'm right now investigating a PCB defect..

Edit

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The last hypothesis was the good one : I found a short circuit in PCB routing.

Solution : isolate the short circuit, replace the isolated track with a simple wire.

Thread is closed !