What is RAM (Random Access Memory) ?
This memory is like a chip, which is made
of metal oxide semiconductor (MOS). It is
called RAM in short.
All the information present in RAM is
temporary and as soon as the power
supply of the computer is turned off, all
the information is destroyed i.e. there is a
volatile memory. RAM is used to store
data and read the data present in it (in
memory). RAM is two types Dynamic
RAM It is also called D RAM. The storage
cell circuits of the DRAM chip consist of a
transistor and a capacitor. D RAM is
refreshed frequently, due to which its
speed slows down. In this way, the
dynamic RAM chip provides the facility of
such memory, the information of which is
lost when the power is turned off.
Types of RAM are
□ STATIC RAM
□ DYNAMIC RAM
* Static RAM
Static RAM It is also called S RAM. In this
data is stored as long as the power
supply is turned on. The storage cell
circuits in static RAM consist of more than
one transistor.
Types of STATIC RAM are
( i ) Non - Volatile S RAM
( ii) Asynchronous S RAM
( iii) Synchronous S RAM
Asynchronous SRAM :- Asynchronous In
which Address transition has all control of
data in and data out , and it contains the
independent of clock frequency.
Synchronous :- Synchornous In which , all
control signals , data , and address are
linked with the clock signals.
* Dynamic RAM
It is also called D RAM. The storage cell
circuits of the DRAM chip consist of a
transistor and a capacitor. The same RAM
is refreshed frequently, due to which its
speed slows down. In this way, the
dynamic RAM chip provides the facility of
such memory, the information of which is
lost when the power is turned off.
Types of D-RAM are
( i ) SD RAM (Synchronous Dynamic RAM)
( ii ) RD RAM ( Rambus Dynamic RAM )
( iii ) DDRSD RAM ( Double Data Rate Synchronous Dynamic RAM )
SD RAM :- The full form of SDRAM is
Synchronous Dynamic Random Access
Memory . It works according to the clock
synchronization, and it synchronizes with
the bus, which is present in CPU of the
system. It is faster than the DRAM .
it can access any element of data within 25
to 10 nano second SDRAM are used in the
DIMM ( dual in - line memory module )
along with 168 contacts .
RDRAM :- The full form of RDRAM is Ram
bus Dynamic Random Access Memory .
As the name implies , developed
by Rambus from the 1990s .its operating
speed more as compared to the other types
of DRAM.
RDRAM was designed by Rambus Inc ;
especially for graphic card . Now these
days , modern RDRAM has higher data
transfer rate to CPU memory bus
because it includes several new speedup
techniques such as synchronous memory
interface system caching enabled DRAM
chips and faster signal timing RDRAM
consist of 8 or 9 bits width data bus.
DDR SDRAM : -DDR SDRAM stands for
"Double Data Rate SDRAM", and it
provides the more bandwidth to all users.
It is capable to accept the same commands
at the once per cycle, and it can transfer
double words of data with one clock cycle
at a same time. Its clock rates are 133 , 166
and 200 MH.
Read More :
What is ROM (Read Only Memory) ? & Types of ROM.
Output device and his types define and
0 Comments