This presentation we explained about RAM memory and its types,memory cell structure.It will be very help full to all of u for symposiums .
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1. BATCH MEMBERS P.PRABAKARA PANDIAN K.SIMON PAULRAJ
2. OVERVIEW INTRODUCTION VOLATILE MEMORY RAM TYPES OF RAM
DEFINITIONS DRAM SRAM DIFFERENCE BETWEEN SRAM AND DRAM TRAM ZRAM
TTRAM ADVANTAGE OF RAM
3. INTRODUCTION Volatile memory also known as volatile storage
that requires power to maintain the store information. Most forms
of modern Random Access Memory are volatile memory. Random Access
Memory, or RAM, provides large quantities of temporary storage in a
computer system.
4. VOLATILE MEMORY It is also known as temporary memory because
if we switch off the power the contents in this memory will be
erased. It is of high cost. It is also known as primary memory
5. MEMORY BLOCK DIAGRAM n Data Input Lines nk Address Lines
Memory k Unit 2k Words 1 n Bits per Word Read 1 Write n n Data
Output Lines
6. BLOCK DIAGRAM OF RAM 2k x n memory k ADRS OUT n n DATA CS
WR
7. RAM RAM stands for Random Access Memory. It is a form of
computer data storage. The RAM can perform both read and write
operations. The process of storing new information into the memory
is called read operation. The process of transferring the stored
information out of memory is called write operation.
8. Common RAM Types D-RAM S-RAM T-RAM Z-RAM TT-RAM
9. RAMBIPOLAR MOS SRAM SRAM DRAM
10. DEFINITIONSSRAM Static random access memory uses multiple
transistors, typically four to six, for each memory cell but doesnt
have a capacitor in each cellDRAM Dynamic random access memory has
memory cells with a paired transistor and capacitor requiring
11. CMOS RAM CMOS RAM is a term for the small amount of memory
used by your computer and some other devices to remember things
like hard disk settings -- see Why does my computer need a battery?
for details. This memory uses a small battery to provide it with
the power it needs to maintain the memory contents.
12. MEMORY CELL
13. D-RAM It stands for Dynamic Random Access Memory. It is a
type of RAM that stores each bit of data in a separate capacitor
within a integrated circuit. The main memory in the personal
computer is Dynamic RAM Basic Principle: Storage of information on
capacitors. Charge and discharge of capacitor to change stored
value
14. DRAM(continue..) Common D-RAM models are DIP 16-pin(Dual
Inline Packages) SIPP (Single Inline Pin Package) SIMM(Single
Inline Memory Module) SIMM 30-pin SIMM 72-pin DRAM is called
dynamic because it must constantly be refreshed or it will lose the
data which it is supposed to be storing.
15. SRAM It stands for Static Random Access Memory. It is a
type of semi-conductor memory where the static indicates that
unlike Dynamic RAM. It does not required to be refreshed
periodically. Each bit is stored on four transistor that forms two
cross coupled inverters.
16. Memory Cell Select B C S Q C R Q B RAM cell
17. DESIGN
18. SRAM STATIC information stored in latches An S-RAM cell has
three different stages.They are Standby Reading Writing
19. SRAM(continue..) S-RAM is a little more expensive,but
faster and significantly less power hungry than DRAM. Due to a more
complex internal structure , SRAM is less dense than DRAM.
20. DIFFERANCEs.no SRAM DRAM It requires low amount of It
requires more memory. 1. memory. 2. Access time is low. Access time
is more. The life of data is as long as the The life of data is
about four 3. power is supplied to the chip . Milliseconds. 4. Do
not refresh. Needs to be refreshed. 5. More structural Less
structural complexity. complexity.
21. T-RAM It stands for Thyristor Random Access Memory. It is a
new type of D-RAM computer memory invented and developed by T-RAM
semiconductor. It departs from the usual design of memory cells
combining the strengths of the D-RAM and S- RAM.
22. T-RAM(continue..) It is produced in 32nm and 22nm. It is
assumed that next generation processors used this type of memory It
has high speed and high volume.
23. Z-RAM It stands for ZERO-CAPACITOR Random Access Memory. It
is developed by innovative Silicon Based on the floating body
effect of Silicon On Insulator(SOI). Z-RAM licenced by Advance
Micro Devices for possible use in future microprocessor.
24. Z-RAM(continue..) The reduced cell size leads the Z-RAM
being faster than S-RAM used in large enough blocks. It has a
response time of 3ns. It offers equivalent speed as S-RAM but
requires less space.
25. TT-RAM It stands for Twin Trasistor Random Access Memory.
It is similar to conventional one transistor,one capacitor as D-RAM
but eliminates the capacitor by relying on floating body effect
inherent in a Silicon On Insulator(SOI) on manufacturing
process.
26. TT-RAM(continue..) In this RAM memory cell, two transistors
are serially connected on an SOI substrate. One is an access
transistor and the other is used as a storage transistor and
fulfils the same function as the capacitor in an conventional D-RAM
cell.
27. APPLICATION OF RAM RAMs are utilized in the computer as
scratch- pad,buffer and main memories. Fast operating speed. Low
power dissipation Compatibility Economy: MOS memories are more
economical than magnetic core for small and medium-sized
systems.
28. CONCLUSION The memory is a major component in any computer.
RAM is capacity and speed characteristics are important in
determine the performance of a computer. So Volatile memory is the
one of the main part of the computer. RAM means speed of the
computer , so there is no RAM there is no speed.
29. REFERENCE 1.Computer Organisation- Dr. M. Rajaram &
Dr.P.Uma Maheswari 2.Digital Computer Fundamentals- Carl Hamacher
& Safwat Zaky 3.Digital Electronics-S.Salaivahanan
4.www.crocus_technology.com 5.http::/hardwarehell.com
6.http::/en.wikipedia.org