ALU TABLE FOR CONTROL WORD: -
Binary
Code
Function of selection variables
A
B
F with
Cin = 0
F with
Cin = 1
D
H
0 0 0
Input Data
Input Data
A-1
A
None
1’s to the output Bus
0 0 1
R1
R1
A-B-1
A-B
R1
Shift Left with IL=0
0 1 0
R2
R2
A
A+1
R2
Circulate-Left with Carry
0 1 1
R3
R3
A+B
A+B+1
R3
0’s to the output Bus
1 0 0
R4
R4
A
-
R4
No Shift
1 0 1
R5
R5
A XOR B
-
R5
-
1 1 0
R6
R6
A AND B
R6
Circulate-Right with Carry
1 1 1
R7
R7
A OR B
R7
Shift Right with IR=0
Control Word :-
A
H
B
F
Cin
D
