Memory : Classification and Application

Random Access Memory (RWM or RAM)

Memory : Classification and Application

Random access memory is also called as read write memory (RWM).

The memory locations in this type of memory are organized in such a way that the access time required for accessing any location is the same. This is the advantage of using RAM over the sequential memories.

RAMS also can be further classified into two types namely the static RAM and dynamic RAM.

RAMS can be fabricated using either bipolar technology or unipolar technology.

Read Only Memories (ROM)

These memories are designed only for reading the information which is already stored on them. The user cannot write any new information on them. 

These are similar to the pre-recorder cassettes. 

A manufacturer or someone else can write ROMs, but the writing process is much more complicated as compared to that of a RAM. 

ROM is used to store fixed informations such as look up tables, instructions, fixed data etc.

It is possible to organize ROMs in such a way that reading time required for any location remains same.

We know that the information stored in a ROM is of permanent nature. It can be only read and cannot written.

Following advantages make the ROM an important part of many digital systems:

1. Low cost 
2. High speed
3. Flexibility in system design. 
4. ROM is a nonvolatile memory.

Some of the important applications of ROM are:

• For implementation of combinational circuits.
• For implementation of sequential circuits. 
• In character generation.
• Look up tables.
• Storage of microprocessor program. 
• Suitable for the LSI manufacturing process.

The ROMs are further classified into three categories as follows:

1. Read Only Memory. 
2. Programmable Read Only Memory (PROM).
3. Erasable and Programmable ROM (EPROM).

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