Task-1: Suppose the hypothetical processor of (Fig 1.3) also has two I/O instructions:0011 Load AC from I/O0111 Store AC to I/OIn these cases, the 12-bit address identifies a particular external device. Show the program execution (Fig 1.4) for the following program:1. Load AC from device 5.2. Add contents of memory location 940.3. Store AC to device 6.Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2. Example of Program ExecutionFetch StageExecute StageMemory30019 40301 5 9 4 1302 2 9 4CPU Registers300 PCMemory30019 40|AC 301 5 9 411940 IR 302 2 9CPU Registers301 PC0003 AC1940 IR9400 0 0 39410 0 09400 0 0 39410 0 0 2Step 2Memory30019 400003 AC 3015 9 4 15941 IR 302 2 9 4 1Step 1CPU Registers302 PC0005 AC5941RCPU RegistersMemory300I9 4 0301 5 9 4 1302 2 9 4 1301 PC940 0 0 0 39410 00 2940 0 0 0 3941 0 0 0 2Step 3Мешогy30019 4 0301 5 9 4 1302 2 9 4Step 4CPU Registers30 2 PC0005 AC 301 5 9 4 12941 IR 302 2 9 4 1CPU Registers30 3 PC0005AC2 9 4 1 IRMemory300I 9 4 09400 0 0 3941 0 0 0 2940 0 00 3941 0 005Step 5Step 6Figure 1.4 Example of Program Execution(contents of memory and registers in hexadecimal) 3 415OpcodeAddress(a) Instruction format0 115SMagnitude(b) Integer formatProgram counter (PC) = Address of instructionInstruction register (IR) = Instruction being executedAccumulator (AC) = Temporary storage(c) Internal CPU registers0001 = Load AC from memory0010 = Store AC to memory0101 = Add to AC from memory(d) Partial list of opcodesFigure1.3 Characteristics of a Hypothetical Machine

Answered: Suppose the hypothetical processor of…

Database System Concepts

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ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Task-1:

Suppose the hypothetical processor of (Fig 1.3) also has two I/O instructions:
0011 Load AC from I/O
0111 Store AC to I/O
In these cases, the 12-bit address identifies a particular external device. Show the program execution (Fig 1.4) for the following program:
1. Load AC from device 5.
2. Add contents of memory location 940.
3. Store AC to device 6.
Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2.

Example of Program Execution
Fetch Stage
Execute Stage
Memory
30019 40
301 5 9 4 1
302 2 9 4
CPU Registers
300 PC
Memory
30019 40
|AC 301 5 9 41
1940 IR 302 2 9
CPU Registers
301 PC
0003 AC
1940 IR
9400 0 0 3
9410 0 0
9400 0 0 3
9410 0 0 2
Step 2
Memory
30019 40
0003 AC 3015 9 4 1
5941 IR 302 2 9 4 1
Step 1
CPU Registers
302 PC
0005 AC
5941R
CPU Registers
Memory
300I9 4 0
301 5 9 4 1
302 2 9 4 1
301 PC
940 0 0 0 3
9410 00 2
940 0 0 0 3
941 0 0 0 2
Step 3
Мешогy
30019 4 0
301 5 9 4 1
302 2 9 4
Step 4
CPU Registers
30 2 PC
0005 AC 301 5 9 4 1
2941 IR 302 2 9 4 1
CPU Registers
30 3 PC
0005AC
2 9 4 1 IR
Memory
300I 9 4 0
9400 0 0 3
941 0 0 0 2
940 0 00 3
941 0 005
Step 5
Step 6
Figure 1.4 Example of Program Execution
(contents of memory and registers in hexadecimal)

3 4
15
Opcode
Address
(a) Instruction format
0 1
15
S
Magnitude
(b) Integer format
Program counter (PC) = Address of instruction
Instruction register (IR) = Instruction being executed
Accumulator (AC) = Temporary storage
(c) Internal CPU registers
0001 = Load AC from memory
0010 = Store AC to memory
0101 = Add to AC from memory
(d) Partial list of opcodes
Figure1.3 Characteristics of a Hypothetical Machine

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