361 Computer Architecture Lecture 14: Cache Memory

[Pages:20]361 Computer Architecture Lecture 14: Cache Memory

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The Motivation for Caches

Memory System

Processor

Cache

DRAM

? Motivation: ? Large memories (DRAM) are slow ? Small memories (SRAM) are fast

? Make the average access time small by: ? Servicing most accesses from a small, fast memory.

? Reduce the bandwidth required of the large memory

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Outline of Today's Lecture

? Recap of Memory Hierarchy & Introduction to Cache ? A In-depth Look at the Operation of Cache ? Cache Write and Replacement Policy ? Summary

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An Expanded View of the Memory System

Processor Control

Datapath

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Speed: Fastest Size: Smallest Cost: Highest

Memory Memory

Memory

Memory

Memory

Slowest Biggest Lowest

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Levels of the Memory Hierarchy

Capacity Access Time Cost

CPU Registers 100s Bytes ................
................

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