control unit working
TRANSCRIPT
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
1
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
R2
2
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
MAR
R2
3
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
MARRead
R2
4
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
MARRead
Select4
R2
5
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
MARRead
Select4
ADDPC+4
R2
6
R1
R1
PC
MDR
MAR
Y
IR
Control/Decode Unite
Pcout, MARin, Read, Select4, Add, Zin
Z
Constant 4
MARRead
Select4
ADDPC+4
Z
R2
7
R1
R1
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, Pcin, Yin, WMFC
R2R2
8
R1
R1
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, Pcin, Yin, WMFC
PC
R2
9
R1
R1
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, Pcin, Yin, WMFC
PC
Y
R2
10
R1
R1
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, Pcin, Yin, WMFC
PC
Y
WMFC
Waiting for the Data to come from the memory. When the data or Instruction is available, it will be Latched into MDR
R2
11
R1
R1
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
MDRout, IRin
PC
Y
R2
12
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
MDRout, IRin
PC
Y
IR
ADD R1, R2
13
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R1out, Yin, SELECTY
PC
Y
IR
ADD R1, R2
14
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R1out, Yin, SELECTY
PC
Y
IR
ADD R1, R2
Y
15
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R1out, Yin, SELECTY
PC
Y
IR
ADD R1, R2
Y
SelectY
16
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R2out, ADD, Zin
PC
Y
IR
ADD R1, R2
Y
SelectY
17
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R2out, ADD, Zin
PC
Y
IR
ADD R1, R2
Y
SelectY
ADD
18
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
R2out, ADD, Zin
PC
Y
IR
ADD R1, R2
Y
SelectY
ADD
Z19
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, R1in, END
PC
Y
IR
ADD R1, R2
Y
SelectY
ADD
Z20
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, R1in, END
PC
Y
IR
ADD R1, R2
Y
SelectY
ADD
Z
R1
21
R1
R2
PC
MDR
MAR
Y
Z
IR
Control/Decode Unite
Constant 4
Zout, R1in, END
PC
Y
IR
ADD R1, R2
Y
SelectY
ADD
Z
R1
22