CS501 Assignment No. 03 Solution Spring 2013 Due Date: 17-05-13

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Assignment No. 03, Semester: Spring 2013, CS501: Advanced Computer Architecture, Due Date: 17-05-13

Instructions
Please read the following instructions carefully before assignment submission.
It should be clear that your assignment will not get any credit if:

The assignment is submitted after the due date.
The submitted assignment does not open or file is corrupt.
The assignment is found to be copied from the internet.
The assignment is found to be copied from other student.
The assignment submitted is not according to required file format (.doc).

Objective
The objective of this assignment is:

To assess your overall understanding of Computer Architecture and Organization
To assess your overall understanding of Computer Instructions
To assess your overall understanding of Fetch, Decode and Execute Cycle

Note:

The assignment should be in .doc format.
Assignment .03 covers lecture 11-14. You can also consult reference books for help.
Students are advised to submit their assignment as early as possible in order to avoid any sort of inconvenience like Load shedding etc.

Question No 1 (a): Marks 5
Problem Statement:
You are required to design a 4-bit mini-CPU which will perform 4 operations: ADD, SUB, OR, and AND. The CPU does only fixed-point, positive number manipulations so you do not have to worry about negative numbers.

Both data and instructions are loaded from a single bus which comes from the computer memory. You do not have to worry about the other end of that bus.

You need to do:

This is the design of 4-bit mini CPU which has 2 operands, a clock, ALU and executed output state. You are required that to fill the asked points (?) in the given diagram with appropriate function OR operation.
NOTE: Remove question marks (?) and write correct operations.

Hints:

The count generator resets after every 8 counts.
ALU using ADD, AND, OR and SUB operations.

Q. 1 Question No 1 (b): Marks 10
Explain the CPU execution with respect to given points (1,2, 3, 4, 5 and 6).

1. Working of Bit Counter (definition will not acceptable)
2. Identify first then define operation. (definition will not acceptable)
3. Explain the working of Program Counter (PC). (definition will not acceptable)
4. Identify the total number of bits and then defend your answer. You are required to answer for both 4-Bit and 8-Bit CPUs.

5&6. Explain the main difference between MDR and MAR. (definitions will not acceptable) Question No 2: Marks 5

The given design is for 4-Bit CPU, you are required to convert it into 8-Bit CPU d