Specifications

Computer Architecture and Maintenance (G-Scheme-2014)
because of the extra logic features. But the benefits of SDRAM allowed more than one
set of memory, which increased the bandwidth efficiency.
With the introduction of DDR, SDRAM quickly began to fade out of use because
DDR was cheaper and
more cost effective. The
SDRAM used a 168-pin
while the DDR module
used a 184-pin. SDRAM
modules used a voltage of
3.3V and DDR used 2.6V,
producing less heat.
Features of SDRAM
1) Speed is between 100Mhz to 133Mhz
2) Sizes Available is 32Mb,64Mb,128Mb,256Mb,512Mb,1Gb
3) Operating Voltage is 3.3V
4) Synchronous Architecture
5) SDRAM is synchronized with the computer's clock to allow it to send
instructions more efficiently by joining a pipeline of other instructions the
computer is processing.
6) The pipelining of information in a computer allows it to receive another
command before it has finished processing the previous command.
7) This allows SDRAM to operate at much higher speeds, making it the most
popular form of RAM offered on computers.
8) SDRAM module are of 168 pin
9) It prefetch 1 bit at a time
DDR (Dual Data Rate)
Q.What is DDR
Ans. In computing, a computer bus operating with double data rate (DDR) transfers
data on both the rising and falling edges of the clock signal.This is also known as
double pumped, dual-pumped, and double transition. The term toggle mode is used in
the context of NAND flash memory.
The simplest way to design a clocked electronic circuit is to make it perform one
transfer per full cycle (rise and fall) of a clock signal. This, however, requires that the
Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)
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