Answered: The following diagram shows some…

Database System Concepts

7th Edition

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

Problem 1PE

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The following diagram shows some registers like processor registers R1 and R2, Program counter PC and Index Register XR along with their corresponding values. It also shows a memory with some instructions like instruction A and next instruction.

The memory holds instruction B which consists of four fields as given above. First field of instruction represents the addressing Mode (I), second field specifies Opcode (operation code) ADD representing operation addition, the third field represents Address field 1 and the fourth field represents Address field 2. Consider the following addressing modes, evaluate the result of execution of above instruction by giving steps of evaluation for each addressing mode for the scenario given above.

Ø Immediate Mode

Ø Direct Mode

Ø Register

Ø Relative Mode

Ø Index Mode

Choose your own values for variables (v – w), T1, T2. Choose any one of the given value for T3 (200 or 300).

V=700

W=800

T1=100

T2=200

T3=300

PC
101
Instruction B
102
Next Instruction
R1 = T1
200
K
250
L
R2 = T2
300
M
302
XR = T3
400
402
P
500
Q
600
R
602
S
650
700
800
V
Instruction B
Mode
ADD
200
300
(1)
(Opcode)
(Address field 1)
(Address field 2)

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