I’m using the CW305 Artix target for Power-SC measurement very successfully so far.
As my setup is becoming stable, I’d like to get rid of the Jumper Cables connected to JP3, that connect a necessary control board to the CW305 FPGA. This is where the 20-pin connector came to my mind.
I can see in the schematic that many pins of this connector are routed to FPGA-pads, so they are directly usable for communication with the FPGA. But two pins on the 20-pin connector remain unconnected, except for the ESD protection.
In particular, I refer to
PRST. With these Pins connected to the FPGA, I could route my SPI-connection “properly” across the 20-pin connector.
I’ll probably be able to just use the remaining, connected, pins of the 20-pin connector for my communication interface instead. But I was wondering, if there is a reason, why these two pins are not connected to the FPGA on the PCB? I might have overlooked something!