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Memory and Storage

Memory and Storage. Computer Memory. Processor registers Temporary storage locations within the CPU Examples Instruction register – holds the instruction that the CPU is working on Program Counter – holds the address of the next instruction to be fetched. Computer Memory Continued.

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Memory and Storage

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  1. Memory and Storage

  2. Computer Memory • Processor registers • Temporary storage locations within the CPU • Examples • Instruction register – holds the instruction that the CPU is working on • Program Counter – holds the address of the next instruction to be fetched

  3. Computer Memory Continued • Cache Memory Small memory between the CPU and Primary memory • Classes • L1 – on the CPU chip – small capacity 8Kb – 256 KB • L2 (64Kb – 4MB) • Newer chips have advanced transfer cache on the chip • Older chips use off chip cache on the Motherboard • L3 – off chip cache if L2 is on the chip

  4. Computer Memory Continued • Primary memory • RAM – random access memory that can be read and written • Textbook refers to this as RWM –read/write memory • ROM – random access memory that can only be read

  5. Computer Memory Continued • Secondary Memory • Direct Access Devices • hard drive • floppy disk • DVD • ZIP drives • CD-Rom, CD-RW, CD-W • Serial Access devices • Tape drives

  6. Memory Parameters • Capacity • Maximum number of bytes or words that it can store • Access time • Time taken by the memory module to access data after an address is provided • Data Transfer Rate • Number of bits per second that can be read out of memory • Cycle Time • Measure of how often the memory can be accessed • Cost • Price of memory per bit/byte

  7. Access time • Ram or Rom - how long after an address is provided that the data is available at the Memory Buffer Register. The access time is the same for all memory locations on the same chip. • Disk access - takes into account rotation delay to get to the proper sector(based on the rpm of the disk), Head movement to get to the proper track

  8. Memory hierarchy • as far as speed and cost on page 155

  9. Ram http://www.pcguide.com/ref/ram/types.htm • static • each memory cell storage element is a flip flop • faster than dynamic but more costly • takes up more room on a chip per bit • used in cache memory • dynamic • each memory cell storage element is a capacitor or a transistor acting like a capacitor • needs refresh circuitry • slower but less expensive than static • used in regular Ram in your PC

  10. Static Ram • memory cell on page 157 • read (see what the contents are) • write (change the contents)

  11. Dynamic Ram • page 161 and 162

  12. Decoding • linear decoding page 158-159 • coincident decoding page 160 and 162

  13. ROM explained pg 163

  14. memory addressing • number of words = 2 ^ number of addressees • 1 address for 2 words • 2 addresses for 4 words • 1024 = 2 ^10 -> 10 addresses for 1K words • 2048 = 2 ^11 -> 11 addresses for 2K words

  15. Memory system design using IC’s • pg 173-174 • increasing the number of words • increasing the number of bits

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