Semiconductor memory

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Semiconductor memory

  1. 1. Semiconductor Memories www.ustudy.in
  2. 2. <ul><li>Semiconductor memory  is an electronic data storage device, often used as computer memory, implemented on a  semiconductor-based integrated circuit . </li></ul>Introduction www.ustudy.in
  3. 3. Semiconductor memory www.ustudy.in
  4. 4. Example of Semiconductor memory <ul><li>Examples of semiconductor memory includes Non-volatile memory such as Read-only memory (ROM), Magnetoresistive Random Access Memory (MRAM), and Flash memory . </li></ul><ul><li>It also includes volatile memory  such as  Static Random Access Memory  (SRAM) </li></ul>www.ustudy.in
  5. 5. Cont., <ul><li>These memories can be constructed to store large amount of data entirely within a computer system. </li></ul><ul><li>The number of locations and the size of storing data may vary from memory to memory. </li></ul><ul><li>Each location is called Memory cell . </li></ul>www.ustudy.in
  6. 6. Memory cell operation www.ustudy.in
  7. 7. Memory cell <ul><li>The memory cell is used to store single bit of information . </li></ul><ul><li>The memory cell is fabricated by using either bipolar Metal Oxide Semiconductors (MOS) or Complementary Metal Oxide Semiconductors (CMOS). </li></ul>www.ustudy.in
  8. 8. Semiconductor memory classification www.ustudy.in
  9. 9. Memory Architecture: Decoders www.ustudy.in
  10. 10. Array-Structured memory Architecture www.ustudy.in
  11. 11. Hierarchical memory Architecture www.ustudy.in
  12. 12. Memory Timing Definitions www.ustudy.in
  13. 13. Memory Timing Approaches www.ustudy.in
  14. 14. Read-Write Memories (RAM) <ul><li>Static (SRAM) </li></ul><ul><li>Data stored as long as supply is applied </li></ul><ul><li>Large (6 transistor/cell) </li></ul><ul><li>Fast </li></ul><ul><li>Differential </li></ul>www.ustudy.in
  15. 15. Read-Write Memories <ul><li>Dynamic (DRAM) </li></ul><ul><li>Periodic refresh required </li></ul><ul><li>Small (1-3 transistors/cell) </li></ul><ul><li>Slower </li></ul><ul><li>Single Ended </li></ul>www.ustudy.in
  16. 16. 6- Transistor CMOS SRAM Cell www.ustudy.in
  17. 17. CMOS SRAM Analysis (Write) www.ustudy.in
  18. 18. CMOS SRAM Analysis (Read) www.ustudy.in
  19. 19. 6T- SRAM - Layout www.ustudy.in V DD GND Q Q WL BL BL M1 M3 M4 M2 M5 M6
  20. 20. 3- Transistor DRAM Cell www.ustudy.in
  21. 21. 3-T DRAM Layout www.ustudy.in BL2 BL1 GND RWL WWL M3 M2 M1
  22. 22. DRAM Cell <ul><li>1T DRAM requires a sense amplifier for each bit line, due to charge redistribution read-out. </li></ul><ul><li>DRAM Memory cells are single ended in contrast to SRAM cells . </li></ul>www.ustudy.in
  23. 23. 1-T DRAM cell www.ustudy.in
  24. 24. Semiconductor Memory Trends Memory Size as a function of time: x 4 every three years www.ustudy.in
  25. 25. Semiconductor Memory Trends Increasing die size factor 1.5 per generation Combined with reducing cell size factor 2.6 per generation www.ustudy.in
  26. 26. Semiconductor Memory Trends Technology feature size for different SRAM generations www.ustudy.in
  27. 27. The End <ul><li>…… . Thank You ……. </li></ul>www.ustudy.in

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