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  • Member You - History of the Computer - Cache Memory Part 2 of 2

    An Introduction To Ebusiness
    Computer systems have become ubiquitous. A firm understanding of the technology, as well as the opportunity it creates, is almost essential for the successful running of a business. It is now as important as the ability to prepare a business plan or deal with the VAT office. As recently as the late 1980s, computers
    passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are
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    (Times and speeds quoted are typical, but do not refer to any specific hardware, merely give an illustration of the principles involved.)

    Now we introduce a 'high speed' memory with a cycle time of, say 250 nanoseconds between the CPU and the core memory. When we request the first instruction, at location 100, the cache memory requests addresses 100,101,102 and 103 from the core memory all at the same time, and retains them 'in cache'. Instruction 100 is passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are

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    principles involved.)

    Now we introduce a 'high speed' memory with a cycle time of, say 250 nanoseconds between the CPU and the core memory. When we request the first instruction, at location 100, the cache memory requests addresses 100,101,102 and 103 from the core memory all at the same time, and retains them 'in cache'. Instruction 100 is passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are

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    the CPU and the core memory. When we request the first instruction, at location 100, the cache memory requests addresses 100,101,102 and 103 from the core memory all at the same time, and retains them 'in cache'. Instruction 100 is passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are
    The Benefit Of Paying Off A Mortgage Early Goes Way Beyond Just Numbers
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    sses 100,101,102 and 103 from the core memory all at the same time, and retains them 'in cache'. Instruction 100 is passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are
    How to Cope with Writing Rejections
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    passed to the CPU for processing, and the next request, for 101, is filled from the cache. Similarly 102 and 103 are handled at the much increased repeat speed of 250ns. In the meantime the cache memory has requested the next 4 addresses, 104 to 107. This continues until the predicted 'next location' is incorrect. The process is then repeated to reload the cache with data for the new address range. A correctly predicted address, when the requested location is in cache is known as a cache 'hit'.

    If the main memory is not core, but a slower chip memory, the gains are not

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