This document provides an overview of random access memory (RAM). It discusses that RAM is a type of volatile memory used to store running programs and data. The document outlines the history, technologies, components, types (SRAM and DRAM), capacities, manufacturers, and advantages/disadvantages of RAM. It also includes diagrams of a RAM block and the positioning and structure of RAM modules.

1. THE M. S. UNIVERSITY OF BARODA
POLYTECHNIC
SUBJECT:
RANDOM ACCESS MEMORY
CREATED BY:
Ruchi M. Maurya
Roll no. 03
S.Y.D. 2nd IT

2. Random Access Memory

3. Index:
 Introduction
 History
 Technologies
 Block Diagram
 Position & Structure
 Types of Ram
 Difference
 Capacity to store
 Manufacturing companies
 Advantage & Disadvantage

4. Introduction:
 Random access memory (RAM) is the best
known form of computer memory.
RAM is considered as volatile memory, which
means that the stored information is lost when
there is no power.
RAM is made up of small memory chips that
form a memory module.
Whenever you open a program, it gets loaded
from the hard drive into the RAM.
This is because reading data from the RAM is
much faster than reading data from the hard
drive

5. History:
RAM (Random Access
Memory) was invented
by Robert Heath
Dennard.
At IBM Thomas J
Watson Research
Center in 1968.

6. Technologies Of Ram:
Fpm (Fast page mode) 1990
EDO (Extended data o/p) 1994
SDRAM (Single dynamic RAM) 1996
RDRAM 1998
DDR SDRAM 2000
DDR2 SDRAM 2003
DDR3 SDRAM 2007
DDR4 SDRAM 2012

7. Technologies Of Ram:

8. Block Diagram Of Ram:
2k x n memory
ADRS OUT
DATA
CS
WR
k
n
n
CS WR Memory operation
0 x None
1 0 Read selected word
1 1 Write selected word

9. Block Diagram Of Ram:
 This block diagram introduces the main
interface to RAM.
 A Chip Select, CS enables or disables the
RAM.
ADRS specifies the address or location to read
from or write to.
WR selects between reading from or writing to
the memory.
To read from memory, WR should be set to 0.
OUT will be the n-bit value stored at ADRS.
To write to memory, we set WR = 1.
DATA is the n-bit value to save in memory.

10. Position Of Ram:

11. Structure of Ram:
Notches for socket
”Handles”
Socket
profile
Edge connector

12. Insert Ram into Socket:

13. Eject Ram from Socket:

14. Types Of Ram:
Random Access
Memory
SRAM (Static Random
Access Memory)
DRAM (Dynamic Random
Access Memory)

15. Types Of Ram:
 SRAM (Static Random Access Memory)
 SRAM holds data in a static form, as long as
the memory has power.
 Each bit is stored on four transistor that forms
two cross coupled inverters.
 DRAM (Dynamic Random Access Memory)
 DRAM is called dynamic because it must
constantly be refreshed and lose the data in
very short time.
 DRAM stores each bit of data in a separate
capacitor within a integrated circuit.

16. Difference:
• Requires less memory. • Requires more memory.
• Access time is low. • Access time is more.
• Do not refresh. • Needs to be refreshed.
• Faster access time. • Slower access time.
• More power consumption. • Less power consumption.
• Used in cache memory. • Used in main memory.

17. Capacity Of Ram:
 From Beginning:
256 MB
512 MB
1024 MB (1 GB)
2048 MB (2 GB)
4096 MB (4 GB)
8192 MB (8 GB)
• NOTE: Here every time the size of Ram
increased by multiplying twice.

18. Manufacturing companies:
ASUS
Buffalo Technology
Century
CEON
CHAINTECH
ELIXIR
HP
IBM

19. Advantage:
Programs will load much faster.
Power Efficient, that uses much less
power than disk drives.
Disadvantage:
Volatile: a power outage will cause
irrecoverable data loss.
Space-limited: cost per bit is high.

20. THANK YOU