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RAM and ROM Memory Overview
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RAM and ROM Memory Overview

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Transcript

  • 1. RAM and ROM Memory Overview
  • 2. Introduction  Types of Memory  RAM Memory  ROM Memory  Hybrid Memory
  • 3. Types of Memory
  • 4. RAM Memory  SRAM-Static Random-Access Memory  DRAM - Dynamic Random-Access Memory
  • 5. SRAM  SRAM Internal Structure
  • 6. SRAM Memory  Fastest type of memory  Low density  More expensive  Generally used in small amounts (L2 cache) or expensive servers
  • 7. DRAM Memory  DRAM Internal Structure
  • 8. Types of DRAM  SDRAM - Synchronous dynamic RAM  DDR RAM - Double data rate RAM  DDR2 RAM  DDR3 RAM  DDR4 RAM
  • 9. DRAM Memory  Very high density  Cheap data cache in computers  Must be periodically refreshed  Slower than SRAM  Volatile
  • 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. DDR2 Internal Structure
  • 12. DDR3 Internal Structure
  • 13. DDR Comparison
  • 14. DDR3 and DDR4 Review
  • 15. DDR4 Memory
  • 16. SRAM Memory Interface
  • 17. SDRAM Memory Interface
  • 18. DDR Memory Inreface
  • 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. 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. ROM Memory  Mask ROM - Mask Read Only Memory  PROM - Programmable Read Only Memory  EPROM - Erasable Programmable Read Only Memory
  • 22. PROM Memory
  • 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. Hybrid Memory  Flash Memory  NVRAM - Non-volatile random-access memory  EEPROM - Electrically Erasable Programmable Read-Only Memory
  • 25. Flash Memory  NAND Flash Memory  NOR Flash Memory
  • 26. Flash Memory Architecture
  • 27. NAND Flash Memory
  • 28. NAND Flash
  • 29. NAND vs NOR Flash
  • 30. NAND and NOR Pins
  • 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. NAND Flash Memory
  • 33. NAND Flash
  • 34. NAND Flash
  • 35. NAND Memory Interface
  • 36. Memory Mapping in NOR Flash
  • 37. NOR Flash Interface
  • 38. Memory Mapping in NOR Flash
  • 39. Any Questions
  • 40. Thank You