I want to make a FPGA/CPLD test board to plug into a socket to test the connectivity of the socket.
Does anyone know of a way to check that all of the gnds and powers are connected given that I want to power the test board from the socket. I need to connect an fpga pin to a GND pin (there is ten of them) so that if the connector pin is O/C it floats high but if it is connected to GND then it contributes to the GND plane and vice versa for VCC.
I don't think it can be done without several op amps and I'll have to use some power pins properly but just thought I'd ask.
Colin