I&C SCI 51 Lecture 6: Week 2 Lecture C
7 Oct 2016
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Combine a small amount of fast memory with a large amount of slow. Memory that is large and acts almost like fast memory is called a cache: cache design issues. How to determine which memory cells are in the cache. Cache size: bigger cache = bigger cost 4467 Keep both in one cache, or separate caches. How many bytes are copied into memory at once. If you reference a cell, chances are good that you will reference a neighbor. Input/output: third part of the computer equation: buses and terminals, buses: What are the two components of an i/o device. Operating system: manages all i/o transfers: users: cpu & i/o devices. Controller: controls i/o device & handles bus for it. Disk outputs data as a serial stream. Controller breaks data into units & sends over bus. A series of switches connected to a microprocessor (controller)
