Memory part 2: Organization

4/28/02


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Table of Contents

Memory part 2: Organization

From Last Time: the Memory Hierarchy

Main Memory Background

Random Access Memory (RAM) Technology

Static RAM Cell

Typical SRAM Organization: 16-word x 4-bit

The Problem with SRAM

1-Transistor Memory Cell (DRAM)

Classical DRAM Organization (square)

DRAM Performance

Main Memory Performance

Cycle Time versus Access Time

Increasing Bandwidth - Interleaving

Main Memory Performance

Independent Memory Banks

Fewer DRAMs/System over Time

Page Mode DRAM: Motivation

Fast Page Mode Operation

DRAM Design Goals

DRAM History

Today’s Situation: DRAM

Today’s Situation: DRAM

Summary: Processor-Memory Performance Gap “Tax”

Summary:

 Author: Dr. Doug L. Hoffman

Email: hoffman@dlhoffman.com

Home Page: http://www.dlhoffman.com/classnotes/

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