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The CPU is based on the Harvard Architecture with separate data and program memories. The data memory is completely internal to the CPU. The program memory is external and is accessed through the I/O. All data has to be loaded as constants through machine code instructions. Two of the input pins are used for clock and reset, the remaining ones are used as program input, allowing for an instruction length of 6 bit. The output is multiplexed between the program counter (when clk is ‘1’) and the content of the main register, the Accumulator. Interpreting the accumulator content allows reading the program output.
Execute the shell script ‘run.sh primes’ in the src folder. This will invoke the testbench with a rom emulator and execute a small program to compute prime numbers.
| # | Input | Output |
|---|---|---|
| 0 | clock | cpu_out[0] |
| 1 | reset | cpu_out[1] |
| 2 | inst_in[0] | cpu_out[2] |
| 3 | inst_in[1] | cpu_out[3] |
| 4 | inst_in[2] | cpu_out[4] |
| 5 | inst_in[3] | cpu_out[5] |
| 6 | inst_in[4] | cpu_out[6] |
| 7 | inst_in[5] | cpu_out[7] |