361 Computer Architecture Lecture 14: Cache Memory
[Pages:20]361 Computer Architecture Lecture 14: Cache Memory
cache.1
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
cache.2
1
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
cache.3
An Expanded View of the Memory System
Processor Control
Datapath
cache.4
Speed: Fastest Size: Smallest Cost: Highest
Memory Memory
Memory
Memory
Memory
Slowest Biggest Lowest
2
Levels of the Memory Hierarchy
Capacity Access Time Cost
CPU Registers 100s Bytes ................
................
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