How do I get the 8031 on the XS40 to work?
Q:
I tried using the 8031 in the XS-40 board but it doesn't work. I tried writing a small program to set the bits of port 1 and to display it on the 7 segment display through the FPGA. I gave rst through the parallel port and set the clock for the 8031 from the oscillator present on the board. But it doesn't seem to work. I also set the external address jumper properly. Have I missed something? The port1 itself is not being set. I tried running the ledreg test program on the XS site but it didn't work. The designs tested on the FPGA work. The board also passed the GXStest.
A:
Make sure you have the pins assigned correctly. Check the pad report after compiling the design.
You might want to take a look at the "walking ones" design example in our design database. You can also download it directly from WalkBit.zip. This design uses the 8031 and is entirely VHDL-based.