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Control Unit Working
The document shows the step-by-step operations of an arithmetic logic unit (ALU) performing an addition of registers R1 and R2. It loads the operands into the registers from memory, selects the operands for the addition, performs the addition, and stores the result in the register Z.
Control Unit Working
- 1. Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R2 Z 1
- 2. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R1 2 Z 2
- 3. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R1 2 Z 3
- 4. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite Read MAR IR MDR Constant 4 Y R1 R1 2 Z 4
- 5. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite Read MAR IR MDR Constant 4 Y R1 Select4 R1 2 Z 5
- 6. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite Read MAR IR MDR Constant 4 Y R1 Select4 R1 ADD 2 PC+4 Z 6
- 7. Pcout, MARin, Read,Select4, Add, Zin Control/Decode PC Unite Read MAR IR MDR Constant 4 Y R1 Select4 R1 2 ADD PC+4 Z 7
- 8. Zout, Pcin, Yin,WMFC Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R2 R1 2 Z 8
- 9. Zout, Pcin, Yin,WMFC Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R1 2 Z 9
- 10. Zout, Pcin, Yin,WMFC Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R2 1 Z 10
- 11. Zout, Pcin, Yin,WMFC Control/Decode PC Unite MAR IR WMFC MDR Constant 4 Y Waiting for the Data to come from the memory. R1 When the data or Instruction is available, it will be Latched into MDR R1 2 Z 11
- 12. MDRout, IRin Control/Decode PC Unite MAR IR MDR Constant 4 Y R1 R2 1 Z 12
- 13. MDRout, IRin Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 R2 Z 13
- 14. R1out, Yin, SELECTY Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 R2 Z 14
- 15. R1out, Yin, SELECTY Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 R2 Z 15
- 16. R1out, Yin, SELECTY Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 Z 16
- 17. R2out, ADD, Zin Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 Z 17
- 18. R2out, ADD, Zin Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 ADD Z 18
- 19. R2out, ADD, Zin Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 ADD Z 19
- 20. Zout, R1in, END Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 ADD Z 20
- 21. Zout, R1in, END Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 ADD Z 21
- 22. Zout, R1in, END Control/Decode PC Unite MAR IR MDR ADD R1, R2 Constant 4 Y R1 SelectY R2 ADD Z 22