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RAM and ROM Memory Overview
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Transcript of RAM and ROM Memory Overview
![Page 1: RAM and ROM Memory Overview](https://reader035.fdocuments.in/reader035/viewer/2022070516/58703ee61a28ab4e2c8b5b13/html5/thumbnails/1.jpg)
RAM and ROM Memory Overview
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Introduction
Types of Memory
RAM Memory
ROM Memory
Hybrid Memory
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Types of Memory
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RAM Memory
SRAM-Static Random-Access Memory
DRAM - Dynamic Random-Access Memory
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SRAM
SRAM Internal Structure
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SRAM Memory
Fastest type of memory
Low density
More expensive
Generally used in small amounts (L2 cache) or expensive servers
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DRAM Memory
DRAM Internal Structure
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Types of DRAM
SDRAM - Synchronous dynamic RAM
DDR RAM - Double data rate RAM
DDR2 RAM
DDR3 RAM
DDR4 RAM
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DRAM Memory Very high density
Cheap data cache in computers
Must be periodically refreshed
Slower than SRAM
Volatile
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DDR Internal Structure
Row 1 Row 2 Row 3 Row 40
2
4
6
8
10
12
Column 1Column 2Column 3
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DDR2 Internal Structure
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DDR3 Internal Structure
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DDR Comparison
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DDR3 and DDR4 Review
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DDR4 Memory
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SRAM Memory Interface
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SDRAM Memory Interface
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DDR Memory Inreface
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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
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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
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ROM Memory
Mask ROM - Mask Read Only Memory
PROM - Programmable Read Only Memory
EPROM - Erasable Programmable Read Only Memory
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PROM Memory
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ROM Memory
Programmable by special program tools/modes
Read only memory during normal use
Non-volatile
EPROM uses UV light to reset all bits
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Hybrid Memory
Flash Memory
NVRAM - Non-volatile random-access memory
EEPROM - Electrically Erasable Programmable Read-Only Memory
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Flash Memory
NAND Flash Memory
NOR Flash Memory
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Flash Memory Architecture
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NAND Flash Memory
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NAND Flash
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NAND vs NOR Flash
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NAND and NOR Pins
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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
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NAND Flash Memory
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NAND Flash
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NAND Flash
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NAND Memory Interface
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Memory Mapping in NOR Flash
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NOR Flash Interface
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Memory Mapping in NOR Flash
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Any Questions
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Thank You