What is RAM , DRAM , SRAM and SDRAM?

SDRAM stands for Synchronous Dynamic Random Access Memory

RAM is a form of computer data storage. A random-access memory device allows data items to be read and written in approximately the same amount of time, regardless of the order in which data items are accessed.

The two main forms of modern RAM are static RAM (SRAM) and dynamic RAM (DRAM).



DRAM ( Dynamic Random Access Memory ) is a type of Computer Memory ( RAM / Random Access Memory )  in which each bit of data is stored in a separate capacitor within an integrated circuit. DRAM stores a bit of data using a transistor and capacitor pair, which together comprise a DRAM memory cell. The capacitor can be either charged or discharged; these two states are taken to represent the two values of a bit, conventionally called 0 and 1. In order to keep the data alive the capacitors are to recharged frequently, so it is called DRAM ( Dynamic Random Access Memory ) .

SRAM ( Static random-access memory ) a bit of data is stored using the state of a six transistor memory cell. This form of RAM is more expensive to produce, but is generally faster and requires less power than DRAM and, in modern computers, is often used as cache memory for the CPU.

SDRAM is dynamic random access memory (DRAM) that is synchronized with the system bus. Classic DRAM has an asynchronous interface, which means that it responds as quickly as possible to changes in control inputs. SDRAM has a synchronous interface, meaning that it waits for a clock signal before responding to control inputs and is therefore synchronized with the computer's system bus. The clock is used to drive an internal finite state machine that pipelines incoming commands. The data storage area is divided into several banks, allowing the chip to work on several memory access commands at a time, interleaved among the separate banks. This allows higher data access rates than an asynchronous DRAM.

for more details visit :
http://en.wikipedia.org/wiki/Synchronous_dynamic_random-access_memory
http://en.wikipedia.org/wiki/Random-access_memory
http://en.wikipedia.org/wiki/Static_random_access_memory
http://en.wikipedia.org/wiki/Dynamic_random-access_memory

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