Random Access Memory

RAM is primary memory and RAM stands for “Random Access Memory“. RAM is capable to access any data randomly any time as well as from any location to computer. This is volatile storage memory means to temporary memory in nature, because entire data goes delete while computer get turn off mode. RAM regains all data from CPU in run-time and sends to control unit, and it is a fastest memory to hard disk.

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RAM types are:

Static RAM:

Static RAM is also volatile primary memory, and it made by flip flop. Static Ram works in computer as a form of Cache Memory, but it consumes more power as well as more costly to DRAM. In Static RAM uses six transistors, and each transistor use for one bit.

Dynamic RAM:

Dynamic RAM is other types of RAM, and volatile also in nature. In which use the capacitors for storing data in few milliseconds when power turn on. Dynamic RAM has slow speed as well as consume low power but has capable to store more data compare to SRAM. DRAM is cost effective as well.

However, the advantage of DRAM over SRAM is that it is cheap, can help more data per chip, and generates less heat than SRAM. DRAM is widely used to build the main memory. The following are the different types of DRAM:

 Synchronous DRAM (SDRAM)

 

SDRAM synchronizes itself with the clock speed of the microprocessor to enable faster access to memory.

Enhanced SDRAM (ESDRAM)

This version of SDRAM, though not widely used, includes a small SRAM cache to reduce delays in data access and speed up operation.

Double data rate SDRAM (DDR)

DDR allows data transfer on both the rising and falling edges of the clock cycle, which double the data throughput. DDT SDRAM chips are available in capacities in 128 MB to 1 GB. Although DDR memory is very common, the technology is becoming has becoming outdated and is being replaced by DDR2.

DDR2 chips are the next generation of DDR2 has twice the latency (data access delay) of DDR, it delivers data at twice the speed, thereby performing at same level.

Rambus DRUM (RDRAM)

It is a proprietary, Protocol-based, high-speed memory technology developed by Rambus Inc. RDRAM can operate at extremely high frequencies as compared to other types of DRAMs.

Synchronous link dynamic RAM (SLDRAM)

 This version of SDRAM, not used widely, was basically designed as a royalty-free, open –industry standard design alternative to RDRAM.