Is "Output, Driving Ground" same as out_pin <='0';

Thanks I think I understand now.

I just started using Quartus in July ... my previous Altera design was a 10K10 in MaxPlusII!

This new software is VERY sophisticated, and it looks like you need to leave the gui behind to realize it's true power.

I had used the gui to do this:

set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS INPUT TRI-STATED WITH WEAK PULL-UP"

But never even realized this was possible:

set_location_assignment PIN_E2 -to unused_pin

set_instance_assignment -name RESERVE_PIN "AS OUTPUT DRIVING GROUND" -to unused_pin

Is there a good reference for the qsf file contents?

So far I've been learning by observing what the gui does in there.

BTW: Are you an Altera employee, or just trying to become one:)

Thanks again

Steve