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MEMORY

MEMORY. INTRODUCTION MEMORY WRITE ABILITY AND STORAGE PERMANENCE COMMON MEMORY TYPES COMPOSING MEMORY MEMORY HIERARCHY ADVANCED RAM SUMMERY. INTRODUCTION.

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MEMORY

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  1. MEMORY Ch.Ramesh, Dept. Of E.I.E

  2. INTRODUCTION • MEMORY WRITE ABILITY AND STORAGE PERMANENCE • COMMON MEMORY TYPES • COMPOSING MEMORY • MEMORY HIERARCHY • ADVANCED RAM • SUMMERY Ch.Ramesh, Dept. Of E.I.E

  3. INTRODUCTION We use processors to implement processing, memory to implement storage, buses to implement communication. Memory access can be referred as either read or write. Memory that can be read or write has another control signal. Memory that can support multiple access to different locations simultaneously contains multiple set of control lines, address lines and data lines. Ch.Ramesh, Dept. Of E.I.E

  4. r/w 2k x n read and write memory enable address Words and bits per word. qo qn Memory block diagram Ch.Ramesh, Dept. Of E.I.E

  5. MEMORY WRITE ABILITY AND STORAGE PERMANENCE Write ability : It refers to the manner and speed that a particular memory can be written. Toward the lower end rage different types of memory that can be written to by a special piece of equipment called programmer. Storage permanence: It refers to the ability of memory to hold its stored bits after those bits have been written. Based on this memory can be of 1. volatile memory 2. non volatile memory Ch.Ramesh, Dept. Of E.I.E

  6. In another classification the memory can be in system programmable memory means it can be written by the processor appearing in the embedded system. A memory that is not an in-system programmable can be written by the external means rather than during normal operation of the embedded system. Ch.Ramesh, Dept. Of E.I.E

  7. COMMON MEMORY TYPES Read only memory (ROM) Mask programmed ROM OTP ROM EPROM EEPROM FLASH MEMORY READ WRITE MEMORY Static RAM DRAM PSRAM NVRAM Ch.Ramesh, Dept. Of E.I.E

  8. 8 x 4 ROM WORD - 0 WORD - 1 WORD - 3 3 X 8 DECODER WORD - 4 A0 Word line Word line A2 Data line Data line Programmable Connection Wired or line Wired OR Programmable connection Internal view of 8 x 4 ROM Ch.Ramesh, Dept. Of E.I.E

  9. COMPOSING MEMORY Ch.Ramesh, Dept. Of E.I.E

  10. MEMORY HIERARCHY and CACHE CACHE MAPPING TECHNIQUES CACHE REPLACEMENT POLOCY CACHE WRITE TECHNIQUES CACHE IMPACT ON SYSTEM PERFORMANCE. Ch.Ramesh, Dept. Of E.I.E

  11. ADVANCED RAM THE BASIC DRAM FAST PAGE MODE DRAM EXTENDED DATA OUT DRAM SYNCHRONOUS AND ENHANCED SYNCHRONOUS DRAM RAMBUS DRAM DRAM INTEGRATION PROBLEM MEMORY MANAGEMENT UNIT. Ch.Ramesh, Dept. Of E.I.E

  12. SUMMERY Ch.Ramesh, Dept. Of E.I.E

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