Pull Up Resistors

Altera_Forum · ‎10-15-2007

I've added the following assignment to enable a pull up resistor on an input pin on a 20K100E device.

set_instance_assignment -name PASSIVE_RESISTOR "PULL-UP" -to my_input_signal

When I compile the project there isn't any reference to this pull up in the warnings but I can't find any confirmation that it's been included either.

Any ideas on how to confirm whether or not there in a pull up on the pin?

Thanks

Ben

Altera_Forum · ‎10-15-2007

I don't have an apex design in front of me, but I believe opening the Compilation Report and going to Fitter -> Resource Utilization and there will be three sections, Input Pins, Output Pins and Bidir Pins, with details like this on each one. (This information is definitely there for newer families.)

Altera_Forum · ‎10-15-2007

Thanks for replying but there isn't a pull up column in that file and there isn't any mention of pull ups in the .pin file.

Do you know if you can actually enable pull ups for these devices? I assumed there would be a warning if I couldn't.

Altera_Forum · ‎10-15-2007

I don't think there is one, which would make sense why there is no column for it.

Altera_Forum · ‎10-15-2007

That's what I was fearing, thanks anyway!