) Consider a machine that brings all the operands to registers before

Question

) Consider a machine that brings all the operands to registers before performing the ALU operation. The machine uses PC, IR, and MAR registers. All memory accesses bring data to the AX register. The operations are performed in AC and AX registers, and results are stored in the AC register. List and explain all the microoperations required to execute an instruction AC AC+[MAR] on this machine

13 Sep 2024

Answer :

Word Count : 708

To execute the instruction `AC ← AC + [MAR]` on a machine with the specified architecture, we need to carefully orchestrate several microoperations involving various registers and memory operations. Let's break down the process step by step:

### 1. Understanding the Architecture

Given the architecture:

- Registers: PC (Program Counter), IR (Instruction Register), MAR (Memory Address Register), AC (Accumulator), AX (a temporary data register).
- Memory Access: All memory accesses bring data into the AX register.
- ALU Operation: Operations are performed between AC and AX, with results stored in the AC register.

### Instruction: `AC ← AC + [MAR]`

Objective: Add the value from memory address specified by MAR to the value in AC and store the result in AC.

### Microoperations Breakdown

To execute this instruction, the following microoperations are performed:

1. Fetch the Instruction
- MAR ← PC: Load the address of the next instruction from the PC into MAR.
- Read Memory: Fetch the instruction from the memory address specified by MAR and load it into IR.
______ _______ ______ __________ _____ ____ _____ ___ _________ ______.
________ _____ _____ _____ _____.
________ ________ _________ ____ ___ _________ __________ ______ ____.
____ ___ _____ ____ ___ __________ __________ ____ ______ _____ _______ ___.
__________ ______ _____ _____ ___ __________.
__________ ___ _____ _____ ______ _________ ___ ________ ______ ________.
__________ _________ _________ _________ __________ ___.
________ __________ _____ _____ _________ _______ ____ ____ ____.
______ ______ ___ _______ ________ _________ _______ ___ ____.
______ ________ ______ _____ ____.
_______ _________ __________ _________ _____ __________ ________ _______ ____ ____ __________ _____.
____ _______ ________ _______ ________ ___ ____ ___ _____ ______.
__________ ______ ____ ___ ______.
_________ _______ ______ ___ ________ _________ ________ _____.
_______ ____ ____ _____ ____ _______ _______ _________ _______ _________ ___ _______.
________ ______ _____ ______ _______ ________ _______ ________ _______ _______.
___ _________ ____ ____ ____ _______ _____ _________ _______.
_____ _________ ________ ______ ________ ___ __________ ____ _______ ________ ____.
_____ _________ ________ __________ _____ _______ _________ _________ __________ __________ ______ ______.
_____ _______ ______ __________ ___ __________ ________ ___ ________ ______.
___ __________ ___ _____ ____ ________ _____ ______ ___ ___ __________ ___.
______ __________ __________ ___ _____ _______ ________ _______.
__________ ____ ____ _______ _____ _____.
_____ ____ ___ ________ ____ __________ ____ __________ ___ _________.
__________ _________ _____ ________ ____.
___ ___ _______ __________ ____ ______ _________.
_____ ______ ____ ___ ______ _______.
_________ ___ _____ ____ _______ _________ _______ _______ ___ _____.
_______ __________ __________ ________ ____ _____ ________ ________.
___ __________ _______ _________ _____ ____ ______.
_______ ______ _______ _______ _______ ____ ________.
_______ _________ ___ ___ _______ _______ ________ ___ ___ _______ ___ _________.
_______ ___ _____ ________ _________ _______ __________ ________ ___ ___ ____.
________ ________ __________ _________ _____.
_____ _______ ___ __________ __________ ____ __________ __________ _________ ___ _________.
_________ ______ ________ ____ _____ ________ __________ ______ ________ ______.
_______ ___ __________ _____ __________ ________ ___ _______ _______ ____ _____ ____.
____ _________ ___ ______ __________ __________.
_______ _______ ____ ________ ___ __________ _________ _________ ____.
___ ________ _______ ________ ___ ____ ___ _______ ____ _________.
_________ __________ _____ _________ _____ _____ _____ _____ ____ __________ ___.
_________ ___ __________ ____ ________ _______ ______ ______.
_________ ______ __________ ___ _________ ____ _______.
________ ______ ______ ____ __________ ____ ______ ______ ____ ______ ___ ________.
_____ __________ ___ _____ ___ _____ ______ ____ ________ _____ ___ __________.
_______ ___ ________ ___ __________ ________ _________ ________.
___ ______ ________ _____ _________ __________ _____ ________ __________ ________ ___.
_______ ___ __________ _________ ____ _______ ________ ________ __________.
________ ________ __________ __________ ____ _________.
___ _______ ____ ___ _______ _________ ______ ________ _____ ____ ________.
_____ _______ _______ ______ _______ _________ ___ _______ ______ _____.
______ _________ ___ _________ __________.
____ _________ ____ _____ ______ _______ _________ _______.
_________ _____ _________ __________ ______.
________ ____ ______ __________ ______ _____ _____ _____ ______ ___ ___.
_________ _____ _______ __________ ___ _______.
_______ _____ ________ _____ _______ _______ _______ _______.
__________ ____ ______ _____ _____ ____ ______ ____ ________ _____ __________ ______.
__________ ____ ________ _________ ________ _______ ______.
________ _______ __________ _____.
Get Full Answer on WhatsApp

IGNOU Solved Assignments Assignments Ignou Projects Project Previous Year Solved Exam Papers Notes Notes Sample Question Papers Sample Question Papers

IGNOU NEWS

Assignment Submission Last Date Extended Till 30 June 2026 Click Here★★★IGNOU June 2026 TEE Date Sheet Released Click Here★★★