Ram- random access memory


Random access memory is a form of computer memory that allows you to read and modify information, usually used to store working data and machine code.

A random access memory device allows you to read or write about the same amount of data items regardless of the location of the data inside the memory.

RAM has multiplexing and demultiplexing circuits to connect data lines to the storage addressed for reading or writing entries.

More than one bit of storage is usually accessed at the same address, and RAM devices often have multiple data lines.

RAM is usually associated with unstable types of memory (such as dynamic random-access memory (DRAM) modules) where stored data is lost when the power is removed, although non-unstable RAM has also been developed. Other types of non-volatile memory exist Allows access but does not allow writing activities.It contains most types of ROM and a type of flash memory called NOR-flash.

RAM is generally of two types

  • volatile random-access semiconductor memory static-access memory (SRAM)
  • dynamic-static-access memory (DRAM).
Commercial use of semiconductor RAM dates back to 1965 when IBM introduced the SP95 SRAM chip for their systems / 360 Model 95 computers and Toshiba used DRAM memory cells for its Tosca BC-1411 electronic calculator based on both bipolar (bipolar). 

Commercial MOS memory based on MOS transistors was developed in the late 1960s and has been the basis of all commercial semiconductor memory ever since.

The first commercial DRAM IC chip the Intel 1103 was launched in October 1970.

RAM working principal

The term random access as applied to RAM can be used to directly access any storage location also known as any memory address. Originally the term random access memory was used to separate regular core memory from offline memory.

Offline memory is usually referred to as magnetic tape from which only certain pieces can be accessed by specifying the address sequentially starting at the beginning of the tape.

RAM is organized and controlled in a way that enables the storage and retrieval of data in specific locations and directly from space.

Other types of storage - such as hard drives and CD-ROMs - are also accessed directly or randomly but the term random access is not used to describe other types of such stores.

Similar to sets of RAM boxes that can hold 0 or 1 in each box Each box has a unique address that can be found by counting down columns and rows. A set of RAM boxes is called an array and each box is known as a cell.

To locate a specific cell, the RAM controller sends the column and row addresses to the bottom of a thin electrical line bound to the chip. Each row and column in the RAM array has its own address line. Any data that is read is returned to a separate data line.

RAM is physically small and stored in microchips. It is also small in terms of the amount of data it can hold.A typical laptop computer can come with 8 GB of RAM, while a hard disk can hold 10 terabytes.

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Describes how RAM works

  • RAM microchips are assembled into memory modules that are plugged into a slot on a computer's motherboard.
  • A bus or electrical path set is used to connect the motherboard slots to the processor.
  • The hard drive on the other hand stores data on a magnetic surface that looks like a kind of plastic record.
  • And alternatively an SSD stores data in memory chips that unlike RAM are uninterrupted do not rely on having constant power and do not lose data after the power is turned off.
  • Enables most PC users to add RAM modules up to a certain limit. 
  • Having more RAM on the computer reduces the number of times the data needs to be read from the processor's hard disk an operation that takes longer than reading data from RAM takes RAM access time in nanoseconds while storage memory access time is in milliseconds.

Different between Ram & Flash Memory

Both flash memory and RAM are made up of hard-state chips, but they play different roles in computer systems due to their manufacturing method performance specification and cost. While flash memory is used for storage memory RAM is used as active memory that Performs calculations on recovered data.

A significant difference between RAM and flash memory is that deleting data from NAND flash memory in whole blocks will be slower than RAM where individual bits can delete data.

However NAND flash memory is less expensive than RAM, and it is uninterrupted Unlike RAM it can hold data even when the power is off. Due to its slow speed uninterruptible and low cost Flash is often used for storage memory in SSD.

Types of Ram

Define Ram (Random Access Memory)

There are two main types of RAM:

  •  Statics Ram
  •  Dynamic Ram

Statics ram

Another name for static RAM is ESRAM. This type of RAM stores data using the status of six transistor memory cells. Static RAM is used as cache memory for most processors (CPUs).

Dynamic ram

DRAM stands for Dynamic Random Access Memory. It is a type of RAM that allows you to store each bit of data on a separate capacitor in a specific circuit. Dynamic RAM is a standard computer memory of many modern desktop computers.

This type of RAM is a volatile memory that needs to be refreshed with regular voltage. Otherwise it loses the information stored in it.


SRAM has less access time, so it's faster than DRAM.DRAM access time is longer, so it's slower than SRAM.
SRAM is more expensive than DRAM.DRAM price is lower than SRAM.
SRAM requires a constant power supply, which means this type of memory consumes more energy. DRAM provides reduced power consumption because the data is stored on the capacitor.
It has a complex internal circuitry, and it offers less storage capacity than the same physical size of any DRAM memory chip.

This is the small internal circuitry of one-bit memory cells in DRAM. 

Large storage capacity available.

The packaging density of DRAM is low. DRAM has a high packaging density.

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