Ram And Its Types Pdf

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Nearly every computing-capable device needs RAM.

Different Types of RAM? Explain in Detail

The User can write information to it and read information from it. With Ram any location can be reached in a fixed and short amount of time after specifying its address. The RAM is a volatile memory, it means information written to it can be accessed as long as power is on. As soon as the power is off, it can not be accessed. RAM is made in electronic chips made of so called semiconductor material, just like processors and many other types of chips.

Physically, RAM consists of small electronic chips which are mounted in modules small printed circuit boards. Dynamic RAM: loses its stored information in a very short time for milli sec. Similar to a microprocessor chip is an Integrated Circuit IC made of millions of transistors and capacitors.

In the most common form of computer memory, Dynamic Memory Cell, represents a single bit of data. The capacitor holds the bit of information — a 0 or a 1. The transistor acts as a switch that lets the control circuitry on the memory chip read the capacitor or change its state. A capacitor is like a small bucket that is able to store electrons.

To store a 1 in the memory cell, the bucket is filled with electrons. To store a 0, it is emptied. In a matter of a few milliseconds a full bucket becomes empty. Therefore, for dynamic memory to work, either the CPU or the Memory Controller has to come along and recharge all of the capacitors holding it before they discharge. To do this, the memory controller reads the memory and then writes it right back.

This refresh operation happens automatically thousands of times per second. This refresh operation is where dynamic RAM gets its name. Dynamic RAM has to be dynamically refreshed all of the time or it forgets what it is holding.

The downside of all of this refreshing is that it takes time and slows down the memory. Static RAM uses a completely different technology. S-RAM retains stored information only as long as the power supply is on. They have higher speed than D-RAMs. They store information in Hip-Hope. In static RAM, a form of flip flop holds each bit of memory. A flip-flop for a memory cell takes four or six transistors along with some wiring, but never has to be refreshed.

However, because it has more parts, a static memory cell takes up a lot more space on a chip than a dynamic memory cell. Therefore, you get less memory per chip, and that makes static RAM a lot more expensive. Stores bytes of data information into latches. The latches hold next bytes of information so that in most programs, which are sequentially executed, the data are available without wait states.

They transfer data when the CPU expects them to be ready. Therefore the transfer rate of the data becomes doubles. ROM : Read only memory : Its non volatile memory, ie, the information stored in it, is not lost even if the power supply goes off. It also posses random access property. In other words the contents of ROMs are decided by the manufactures. The following types of ROMs an listed below :. Its contents are decided by the user. The user can store permanent programs, data etc in a PROM.

The data is fed into it using a PROM programs. The entire data is erased and not selected portions by the user. It can be erased with in a few milliseconds. Its used in all power, digital cameras, MP3 players etc. Explain in Detail. What is RAM parity? About Dinesh Thakur.

Different Types of RAM (Random Access Memory) Explained

The User can write information to it and read information from it. With Ram any location can be reached in a fixed and short amount of time after specifying its address. The RAM is a volatile memory, it means information written to it can be accessed as long as power is on. As soon as the power is off, it can not be accessed. RAM is made in electronic chips made of so called semiconductor material, just like processors and many other types of chips. Physically, RAM consists of small electronic chips which are mounted in modules small printed circuit boards.

As soon as the machine is switched off, data is erased. Access time in RAM is independent of the address, that is, each storage location inside the memory is as easy to reach as other locations and takes the same amount of time. Data in the RAM can be accessed randomly but it is very expensive. RAM is volatile, i. RAM is small, both in terms of its physical size and in the amount of data it can hold. The word static indicates that the memory retains its contents as long as power is being supplied.


you turn the computer off, RAM loses its data. When you storage is read-only memory (ROM), a more expensive kind of memory that retains data even when.


Random Access Memory

In contrast, with other direct-access data storage media such as hard disks , CD-RWs , DVD-RWs and the older magnetic tapes and drum memory , the time required to read and write data items varies significantly depending on their physical locations on the recording medium, due to mechanical limitations such as media rotation speeds and arm movement. RAM contains multiplexing and demultiplexing circuitry, to connect the data lines to the addressed storage for reading or writing the entry. Usually more than one bit of storage is accessed by the same address, and RAM devices often have multiple data lines and are said to be "8-bit" or "bit", etc. In today's technology, random-access memory takes the form of integrated circuit IC chips with MOS metal-oxide-semiconductor memory cells.

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DRAM Modules Computer memory is generally classified as either internal or external memory. Internal memory, also called "main or primary memory" refers to memory that stores small amounts of data that can be accessed quickly while the computer is running. External me mory, also called "secondary memory" refers to a storage device that can retain or store data persistently.

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