Semiconductor memory
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Semiconductor memory

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This Presentation has the details about the Semiconductor memory

This Presentation has the details about the Semiconductor memory

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    Semiconductor memory Semiconductor memory Presentation Transcript

    • Semiconductor Memories www.ustudy.in
      • Semiconductor memory  is an electronic data storage device, often used as computer memory, implemented on a  semiconductor-based integrated circuit .
      Introduction www.ustudy.in
    • Semiconductor memory www.ustudy.in
    • Example of Semiconductor memory
      • Examples of semiconductor memory includes Non-volatile memory such as Read-only memory (ROM), Magnetoresistive Random Access Memory (MRAM), and Flash memory .
      • It also includes volatile memory  such as  Static Random Access Memory  (SRAM)
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    • Cont.,
      • These memories can be constructed to store large amount of data entirely within a computer system.
      • The number of locations and the size of storing data may vary from memory to memory.
      • Each location is called Memory cell .
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    • Memory cell operation www.ustudy.in
    • Memory cell
      • The memory cell is used to store single bit of information .
      • The memory cell is fabricated by using either bipolar Metal Oxide Semiconductors (MOS) or Complementary Metal Oxide Semiconductors (CMOS).
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    • Semiconductor memory classification www.ustudy.in
    • Memory Architecture: Decoders www.ustudy.in
    • Array-Structured memory Architecture www.ustudy.in
    • Hierarchical memory Architecture www.ustudy.in
    • Memory Timing Definitions www.ustudy.in
    • Memory Timing Approaches www.ustudy.in
    • Read-Write Memories (RAM)
      • Static (SRAM)
      • Data stored as long as supply is applied
      • Large (6 transistor/cell)
      • Fast
      • Differential
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    • Read-Write Memories
      • Dynamic (DRAM)
      • Periodic refresh required
      • Small (1-3 transistors/cell)
      • Slower
      • Single Ended
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    • 6- Transistor CMOS SRAM Cell www.ustudy.in
    • CMOS SRAM Analysis (Write) www.ustudy.in
    • CMOS SRAM Analysis (Read) www.ustudy.in
    • 6T- SRAM - Layout www.ustudy.in V DD GND Q Q WL BL BL M1 M3 M4 M2 M5 M6
    • 3- Transistor DRAM Cell www.ustudy.in
    • 3-T DRAM Layout www.ustudy.in BL2 BL1 GND RWL WWL M3 M2 M1
    • DRAM Cell
      • 1T DRAM requires a sense amplifier for each bit line, due to charge redistribution read-out.
      • DRAM Memory cells are single ended in contrast to SRAM cells .
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    • 1-T DRAM cell www.ustudy.in
    • Semiconductor Memory Trends Memory Size as a function of time: x 4 every three years www.ustudy.in
    • Semiconductor Memory Trends Increasing die size factor 1.5 per generation Combined with reducing cell size factor 2.6 per generation www.ustudy.in
    • Semiconductor Memory Trends Technology feature size for different SRAM generations www.ustudy.in
    • The End
      • …… . Thank You …….
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