next up previous contents
Next: Memory Structure (メモリの構造) Up: Memory Types (メモリの種類) Previous: Introduction

Memory Hierarchy (階層構造)

\includegraphics[width=12cm]{/home/david/courses/comparch/lectures/memory/figs/memhier.eps}



volatile $\leftarrow$ $\rightarrow$ non-volatile
Memory type CPU Cache Main Disk Tape
Access type Random Random Random Direct Sequential
Capacity* 64-1024 B 8-256 kB 8-128 MB 1-10 GB 1 TB
Latency* 1-10 ns 20 ns 50 ns 10 ms 10 ms - 10 s
Block size* 1 word 16 words 16 words 4 kB 4 kB
Bandwidth* System clock 8 MB/s 1 MB/s 1 MB/s 1 MB/s
Cost/MB* High $500 $30 $0.25 $0.02
* Typical values


next up previous contents
Next: Memory Structure (メモリの構造) Up: Memory Types (メモリの種類) Previous: Introduction
David Asano
2001-05-29