for those seeking to try the project, make sure that the rom in Decimal Decoder circuit got the Decimal Decoder File imported , now to run instructions on the processor "main circuit" write the instructions to the ram, or import instructions file to the ram for example try the 12 + 20 ram ex file , then press the Count Enable button on the Step Counter. "Dont forget to Enable Clock XD"

Additional note: the instructions are made of 8 bits the first four bits for opcode that picks the operation that the processor will do , last four bits for the memory address where the data will be fetched from or be Sent to. in the common instruction steps first the opcode (first 4 bits) will be processed then the memor address will be processed (last 4 bits).

Notes for those who want to apply changes on the project or enhance it :

1. PC maximum value is 2 because this 8 bit processor only process three instructions using the CU: A. (0000 load A) B. (0001 load B) C. (0010 Add A + B)
2. step counter maximum value is 6 because the max steps for an instruction is 6
3. ALU only performs Addition by taking values directly from Reg A and Reg B , if you want to add more operations to the ALU,then update ALU to get an opcode input by adding a 4 bit bus from the IR to the ALU connected by a controlled buffer That is controlled by CU.
4. this processor has no MMU so no logical addresses , physical addresses logic in real computers is being applied here so the addresses that are being created by cpu are being added to RAM directly.