Lec6_Memory_Cache_11 - Lecture 6 Memory System and Cache...

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CC2202 1 Lecture 6 Memory System and Cache Memory
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CC2202 2 Last Week We learnt Combinational Circuit Truth Table and K-Map Today, we will discuss Hierarchical Memory System Cache System Mapping of Content between Cache and Memory
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CC2202 3 Characteristics of Memory System Location Capacity Unit of transfer Access method Performance Physical type Physical characteristics Organisation These are the areas of distinguishing memory types Includes main memory (or simply memory) and storage such as hard disk
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CC2202 4 Characteristics Location CPU Registers Internal RAM External Storage Disk / Tape Capacity Word size The natural unit of organization Number of words or Bytes
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CC2202 5 Characteristics I 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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CC2202 6 Characteristics II Access Methods 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 Random Individual addresses identify locations exactly Access time is independent of location or previous access e.g. RAM Associative Data is located by a comparison with contents of a portion of the store Access time is constant independent of location or previous access e.g. cache
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CC2202 7 Memory Hierarchy Registers In CPU Internal or Main memory May include one or more levels of cache “RAM” External memory Backing store Hierarchy List Registers L1 Cache L2 Cache Main memory Disk cache Disk Optical Tape
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CC2202 8 Memory Hierarchy - Diagram Digital Video Disc Rewriteable (DVD+RW) can be erased and written to, or recorded on, more than 1000 times. DVD Random Access Memory (DVD-RAM) can be erased and written to, or recorded on, more than 100,000 times. DVD-RAM discs can be read by DVD-RAM drives and some DVD-ROM players Compact Disk Read-Only Memory (CD-ROM) uses laser technology to store data, instructions and information Compact Disk Rewriteable (CD-RW) Erasable CD onto which users can write and rewrite data, instructions and information multiple times. Optical disc Magneto Optical disk Size of a floppy disk capable of writing and rewriting data upon WORM (Write Once Read Many or Write Once Read Multiple times) Mostly used in software, manual or document given out by manufacturers since can be written to only once, but read from multiple times.
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CC2202 9 Performance Access time (TA) Time between presenting the
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This note was uploaded on 08/18/2011 for the course COMP 3868 taught by Professor Keithchan during the Summer '97 term at Hong Kong Polytechnic University.

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Lec6_Memory_Cache_11 - Lecture 6 Memory System and Cache...

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