Computer Architecture and Organization - Memory Chip Organization 2, Study notes of Computer Architecture and Organization

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Unit-3: Memory Chip

Organization Contd

Recap

Session Objectives & Teaching Learning

Material

Session Plan

Introduction

Examples

Address Map

Typical Chip Layout

Assignment

References

OutLine

Session Objectives

◦ (^) To teach how to design larger memories using

smaller RAM and ROM chips

Teaching Learning Material

◦ (^) LCD, White board Marker, Presentation slides

Objectives & Teaching

Learning Material

Session Plan

Time

(in min)

Content

Learning Aid

and

Methodology

Faculty

Approach

Typical

Student

Activity

Skill and

Competency

Developed

Re-Cap

Quiz

Presentation

Questions

Organizes

Answers

Identifies

Knowledge

Evaluation

05 Introduction Explains^ Presentations^ Listens^ Knowledge

10 Example1,2 Explains

Presentatio

n

Listens Synthesis

10 Example3,

Presentati

on

Facilitates Listens^ Analytical

10 Chip Layout

Presentati

on

Facilitates Listens^ Analytical

Conclusion and

Summary

Summary Facilitates Participates

Comprehensio

n

Available Chip size = N x W

Available memory size = N

I x W

I

p =

N

N

I

Where N

I ≥

N

q =

W

W

I

Where W

I ≥

W

N is Number of Words

W is Width of Word

p * q, N x

W

Chips are needed

for

N

I x W

I memory size

denotes the smallest integer grater than or equal

Introduction

There are different types of organization of N

1 x W

1 –memory using N x

W –bit chips

Increase number of words by the factor of

If N

I > N W

I & = W

Increase the word size of a Memory by a factor of

If N

I = N W

I & > W

If N

I > N W

I & > W

Increase number of words by the factor of p

Increase the word size of a Memory by a factor of q

Case

Case

Case

q

W

W

I

p

N

N

I

How many 1024x 4 RAM chips are needed to provide a memory capacity of

1024 x 8?

Available memory size = N

I

x W

I

p

N

N

I

Where N

I ≥

N

q

W

W

I

Where W

I ≥

W

p * q, N x

W

Chips are needed for N

I x W

I memory size

= 1024 x 8

Available Chip size = N x W

= 1024 x 4

1 * 2 1024 x

RAM Chips are needed for 1024x 8

memory size =2,

How many 1024x 4 RAM chips are needed to provide a memory capacity of

2048 x 8?

Available memory size = N

I

x W

I

p

N

N

I

Where N

I ≥

N

q

W

W

I

Where W

I ≥

W

p * q, N x

W

Chips are needed for N

I x W

I memory size

= 2048 x 8

Available Chip size = N x W

= 1024 x 4

2 * 2 1024 x

RAM Chips are needed for 2048x 8

memory size =4,

S.NO Memory N x W N

1 x W

1 p q P * q x y z Total

1 RAM 1024 x 8 2048 x 8 2 1 2 10 1 0 11

2

3

4

Component

Hexadecimal address Address bus

From To 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RAM1 000 07F 0

x x x x x x x x x

RAM2 080 100 1

x x x x x x x x x

RAM

1024 X 8

RAM

1024 X 8

How many 128 x 8 RAM chips are needed to provide a memory capacity of

2048 x 8?

Available memory size = N

I

x W

I

p

N

N

I

Where N

I ≥

N

q

W

W

I

Where W

I ≥

W

p * q, N x

W

Chips are needed for N

I x W

I memory size

= 2048 x 8

Available Chip size = N x W

= 128 x 8

• 1 128 x 8 RAM Chips are needed for 2048x 8

memory size

Text Book

William Stallings “Computer Organization

and architecture” Prentice Hall, 7th edition,

References