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Inst-x
A
Inst-z
t
1
C
Inst-x
Inst-y
t
2
B
Inst-x
t
0
Inst-y
t
2
Figure 5.10 Logic circuits for control lines A, B, and C
Fetch the next
instruction
Decode
Inst-x
Inst-y
Inst-z
t
0
t
0
t
0
D, B, E
F, H, G
E, H
t
1
t
1
t
1
C, A, H
D, A, C
G
t
2
t
2
G, C
B, C
Figure 5.11
Instruction execution state diagram
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