The program execution of Figure 1.4 is described in the text using six steps. Expand this description to show the use of the MAR and MBR.

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The program execution of Figure 1.4 is described in the text using six steps. Expand this description to show the use of the MAR and MBR.

Fetch stage
Execute stage
CPU registers
300 PC
Memory
300I9 4 0
301 5 9 4 1
302 29 4I
Memory
300 9 40
AC 301 5 9 41
1940 IR 302 2 9 4 1
CPU registers
301 PC
0 0 0 3 AC
1940 IR
940 0 00 3
941 0 00 2
940 0 00 3-
941 0 0 02
Step I
Step 2
Memory
300 I9 40
301 5 9 4 I
302 29 4 I
CPU registers
301 PC
0003 AC 301 5 9 4 1
5941 IR 302 2 9 4 I
CPU registers
302 PC
000 5AC
5941 IR
Memory
300 I 9 40
940 0 0 0 3
941 0 00 2
3+2= 5-
940 0 00 3
941 0 002
Step 3
Memory
300 I 9 4 0
301 59 4 I
302 29 4
Step 4
Memory
300 1 9 4 0
CPU registers
30 2 PC
0 0 0 5 AC 301 5 9 4 I
294 1 IR 302 2 9 4
CPU registers
303 PC
0 0 0 5 AC
2941IR
940 0 0 03
941 0 00 2
940 0 003
941 0 0 0 5
Step 5
Step 6
Figure 1.4 Example of Program Execution (contents
of memory and registers in hexadecimal)
Transcribed Image Text:Fetch stage Execute stage CPU registers 300 PC Memory 300I9 4 0 301 5 9 4 1 302 29 4I Memory 300 9 40 AC 301 5 9 41 1940 IR 302 2 9 4 1 CPU registers 301 PC 0 0 0 3 AC 1940 IR 940 0 00 3 941 0 00 2 940 0 00 3- 941 0 0 02 Step I Step 2 Memory 300 I9 40 301 5 9 4 I 302 29 4 I CPU registers 301 PC 0003 AC 301 5 9 4 1 5941 IR 302 2 9 4 I CPU registers 302 PC 000 5AC 5941 IR Memory 300 I 9 40 940 0 0 0 3 941 0 00 2 3+2= 5- 940 0 00 3 941 0 002 Step 3 Memory 300 I 9 4 0 301 59 4 I 302 29 4 Step 4 Memory 300 1 9 4 0 CPU registers 30 2 PC 0 0 0 5 AC 301 5 9 4 I 294 1 IR 302 2 9 4 CPU registers 303 PC 0 0 0 5 AC 2941IR 940 0 0 03 941 0 00 2 940 0 003 941 0 0 0 5 Step 5 Step 6 Figure 1.4 Example of Program Execution (contents of memory and registers in hexadecimal)
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