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RAM and ROM Memory Overview

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RAM and ROM Memory Overview

  1. 1. RAM and ROM Memory Overview
  2. 2. Introduction  Types of Memory  RAM Memory  ROM Memory  Hybrid Memory
  3. 3. Types of Memory
  4. 4. RAM Memory  SRAM-Static Random-Access Memory  DRAM - Dynamic Random-Access Memory
  5. 5. SRAM  SRAM Internal Structure
  6. 6. SRAM Memory  Fastest type of memory  Low density  More expensive  Generally used in small amounts (L2 cache) or expensive servers
  7. 7. DRAM Memory  DRAM Internal Structure
  8. 8. Types of DRAM  SDRAM - Synchronous dynamic RAM  DDR RAM - Double data rate RAM  DDR2 RAM  DDR3 RAM  DDR4 RAM
  9. 9. DRAM Memory  Very high density  Cheap data cache in computers  Must be periodically refreshed  Slower than SRAM  Volatile
  10. 10. DDR Internal Structure 12 10 8 Column 1 Column 2 Column 3 6 4 2 0 Row 1 Row 2 Row 3 Row 4
  11. 11. DDR2 Internal Structure
  12. 12. DDR3 Internal Structure
  13. 13. DDR Comparison
  14. 14. DDR3 and DDR4 Review
  15. 15. DDR4 Memory
  16. 16. SRAM Memory Interface
  17. 17. SDRAM Memory Interface
  18. 18. DDR Memory Inreface
  19. 19. SRAM vs DRAM  SRAM is faster compared to DRAM  SRAM consumes less power than DRAM  SRAM uses more transistors per bit of memory compared to DRAM
  20. 20. SRAM vs DRAM Cont.   SRAM is more expensive than DRAM Cheaper DRAM is used in main memory while SRAM is commonly used in cache memory  DRAM Required Refresh cycle  DRAM Required EDC Circuit
  21. 21. ROM Memory  Mask ROM - Mask Read Only Memory  PROM - Programmable Read Only Memory  EPROM - Erasable Programmable Read Only Memory
  22. 22. PROM Memory
  23. 23. ROM Memory  Programmable by special program tools/modes  Read only memory during normal use  Non-volatile  EPROM uses UV light to reset all bits
  24. 24. Hybrid Memory  Flash Memory  NVRAM - Non-volatile random-access memory  EEPROM - Electrically Erasable Programmable Read-Only Memory
  25. 25. Flash Memory  NAND Flash Memory  NOR Flash Memory
  26. 26. Flash Memory Architecture
  27. 27. NAND Flash Memory
  28. 28. NAND Flash
  29. 29. NAND vs NOR Flash
  30. 30. NAND and NOR Pins
  31. 31. Selection Check Point    Most writes must be preceded by an erase operation NAND has smaller erase units for fewer erases in less time NOR is an XIP device
  32. 32. NAND Flash Memory
  33. 33. NAND Flash
  34. 34. NAND Flash
  35. 35. NAND Memory Interface
  36. 36. Memory Mapping in NOR Flash
  37. 37. NOR Flash Interface
  38. 38. Memory Mapping in NOR Flash
  39. 39. Any Questions
  40. 40. Thank You

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