The interrupt, reset, stall, GND and data memory write signals are non-serialized signals. All other signals are serialized, 32-bit wires. The interrupt input allows the user to force an exception upon the beta. An interrupt exception is just like an illegal opcode exception, except that the beta sets its PC to 2 (recall that upon hitting an illegal opcode, the beta sets its PC to 1 and puts the old PC+1 into the XP register). The stall pin, when asserted causes the beta to pause execution. You can use the stall pin and a comparator to set a hardware breakpoint to help with debugging your code. The reset pin causes the beta to set its PC to 0 and start execution from there. Reset does not initialize the register file contents. Two GND outputs are provided so you can tie the interrupt and stall signals to inactive levels in case you don’t want to use them in your design. Because interrupt, stall, and reset are non-serialized inputs, you can connect them to the switch outputs DO[7:0] on the kit terminal strip and use the switches to control these inputs. Note that the LEDs on the Beta block always correspond to the current PC value. The Beta has a Tpd of 2.