this slide is for ram. And its free for all.

1. Random Access Memory
Name:
ID:
Sec:
1

2. Index
 Introduction
 Block Diagram
 Position & Structure
 Type of Ram
 Difference
 Capacity to Store
 Manufacturing Companies
 Advantage & Disadvantage
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3. 1.
Introduction

4. Introduction
 Random access
 considered as volatile memory
 made up of small memory chips
that form a memory module.
 Program gets loaded from the
hard drive into the RAM.
 much faster in reading data
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5. 2.
Block Diagram

6. Block Diagram
6
2k x nmemory
ADRS OUT
DATA CS WR
n
C S W R M e m o r y o p e r a t i o n
0 x N o n e
1 0 R e a d s e l e c t e d w o r d
1 1 W r i t e s e l e c t e d w o r d
 This block diagram introduces the main interface to RAM.
 A Chip Select, CS enables or disablesthe RAM.
 *ADRS specifies the address or location to read from or write to.
 WR selects between reading from or writing to the memory.
 Toread from memory, WR should be set to 0. OUT will be the n-bit
value stored atADRS.
 Towrite to memory, we set WR = 1.DATAis the n-bit value to save
in memory.

7. 3.
Position & Structure

8. Position
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9. Structure
9
Notches for socket
”Handles”
Socket
Edge connector

10. 4.
Type of Ram

11. Types of Ram
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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.
SRAM (Static 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.

12. 5.
Difference between
SRAM & DRAM

13. Difference between SRAM & DRAM
13
• Requires less memory. • Requires more memory.
• Access time is low. • Access time is more.
• Do not refresh.
• Faster access time.
• More power
consumption.
• Needs to be refreshed.
• Slower access time.
• Less power consumption.
• Used in cache memory. • Used in main memory.
SRAM DRAM

14. 6.
Capacity of Ram

15. Capacity of Ram 15
8192 MB
(8 GB)
4048 MB
(4 GB)
2048 MB (2 GB)
1024 MB
(1 GB)
512 MB
256 MB
From
Beginning
NOTE: Here every time the size of Ram increased by
multiplying twice

16. 7. Manufacturing
company

17. MANUFACTURING COMANY
ASUS
CENTURY
BUFFALO
TECHNOLOGY
17
HP
IBM
DELL
CEON
ELIXIR
CHAINTECH

18. 9. Advantage &
Disadvantage

19. 19
Advantage & Disadvantage
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. Thanks!
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