Simple Computer
This is the design and implementation of a simple computer by using quartus II 9.0 and Cyclone II EP2C8T144C8.
Registers
| Symbol | Bits | Name | Function |
|---|---|---|---|
| MAR | 8 | Address Storage Register | Store address of intructions |
| MBR | 8 | Digits Storage Register | Store the digits of address in RAM |
| A | 8 | Register A | A register |
| B | 8 | Register B | B register |
| R | 8 | Register R | R register |
| PC | 8 | Program Counter | Store address |
| IR | 8 | Instructions Register | Store the intruction opcode |
| T | 8 | Timing Counter | Generate Timing Signals |
General Overview
Instructions
| Opcode | Mnemonic | QI | Function |
|---|---|---|---|
| 0000 0000 | LDA ADDR | q1 | Put the content of address ADDR into A |
| 0000 0001 | STA ADDR | q2 | Put A into the content of address ADDR |
| 0000 0010 | ADD A, B | q3 | Add A and B, and then put into A |
| 0000 0011 | SUB A, B | q4 | A substract B, and then put into A |
| 0000 0100 | ADD A, B | q5 | Logic process A&&B, and then put into A |
| 0000 0101 | OR A, B | q6 | Logic process AorB, and then put into A |
| 0000 0110 | MOV, A, R | q7 | Put the content of R into A |
| 0000 0111 | MOC A, R | q8 | Put the content of R into B |
| 0000 1000 | LDI A, OPRD | q9 | Put the oprands into A |
| 0000 1001 | LDC B, OPRD | q10 | Put the oprands into B |
Test Repo
| Address | Content | Description |
|---|---|---|
| 0000 0000 | 0000 0110 | Put the content of R into A |
| 0000 0001 | 0000 1001 | Put the oprands of the following address into B |
| 0000 0010 | 0000 1110 | oprands -- 0000 1110 |
| 0000 0011 | 0000 0010 | add A and B, then put into A |
| 0000 0100 | 0000 0111 | Put the content of R into B |
| 0000 0101 | 0000 1000 | Put the oprands of the following address into A |
| 0000 0110 | 0011 1111 | oprands -- 0011 1111 |
| 0000 0111 | 0000 0011 | A substract B and then put into A |
| 0000 1000 | 0000 1000 | Put the oprands of the following address into A |
| 0000 1001 | 0000 1010 | oprands -- 0000 1010 |
| 0000 1010 | 0000 1001 | Put hte oprands of the following address into B |
| 0000 1011 | 0000 0011 | oprand -- 0000 0011 |
| 0000 1100 | 0000 0100 | logic process A&&B, and then put into A |
| 0000 1101 | 0000 1001 | Put the oprand of the following addresss into B |
| 0000 1110 | 0000 0101 | oprand -- 0000 1001 |
| 0000 1111 | 0000 0101 | logic process AorB, and then put into A |
Expected Results:
a). 00010101
b). 00010001
c). 00111111
d). 00101010
e). 00001010
f). 00000010
g). 00000111