Chap3&4 - William Stallings Computer Organization and...

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William Stallings Computer Organization and Architecture 8 th Edition …Memory Concepts
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Characteristics Location Capacity Unit of transfer Access method Performance Physical type Physical characteristics Organisation
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Location CPU Internal External
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Capacity Word size The natural unit of organisation Number of words or Bytes
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Unit of Transfer Internal Usually governed by data bus width External Usually a block which is much larger than a word Addressable unit Smallest location which can be uniquely addressed Word internally
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Access Methods (1) Sequential Start at the beginning and read through in order Access time depends on location of data and previous location e.g. tape Direct Individual blocks have unique address Access is by jumping to vicinity plus sequential search Access time depends on location and previous location e.g. disk
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Access Methods (2) Random Individual addresses identify locations exactly Access time is independent of location or previous access
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Chap3&4 - William Stallings Computer Organization and...

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