# Operating System | Memory Interleaving

Prerequisite – Virtual Memory
Abstraction is one the most important aspect of computing. It is widely implemented Practice in the Computational field.

Memory Interleaving is less or More an Abstraction technique. Though its a bit different from Abstraction. It is a Technique which divides memory into a number of modules such that Successive words in the address space are placed in the Different module.

Consecutive Word in a Module:

Figure-1: Consecutive Word in a Module

Let us assume 16 Data’s to be Transferred to the Four Module. Where Module 00 be Module 1, Module 01 be Module 2, Module 10 be Module 3 & Module 11 be Module 4. Also 10, 20, 30….130 are the data to be transferred.

From the figure above in Module 1, 10 [Data] is transferred then 20, 30 & finally, 40 which are the Data. That means the data are added consecutively in the Module till its max capacity.

Most significant bit (MSB) provides the Address of the Module & least significant bit (LSB) provides the address of the data in the module.

For Example, to get 90 (Data) 1000 will be provided by the processor. In this 10 will indicate that the data is in module 10 (module 3) & 00 is the address of 90 in Module 10 (module 3). So,

```Module 1 Contains Data : 10, 20, 30, 40
Module 2 Contains Data : 50, 60, 70, 80
Module 3 Contains Data : 90, 100, 110, 120
Module 4 Contains Data : 130, 140, 150, 160 ```

Consecutive Word in Consecutive Module:

Figure-2: Consecutive Word in Consecutive Module

Now again we assume 16 Data’s to be transferred to the Four Module. But Now the consecutive Data are added in Consecutive Module. That is, 10 [Data] is added in Module 1, 20 [Data] in Module 2 and So on.

Least Significant Bit (LSB) provides the Address of the Module & Most significant bit (MSB) provides the address of the data in the module.

For Example, to get 90 (Data) 1000 will be provided by the processor. In this 00 will indicate that the data is in module 00 (module 1) & 10 is the address of 90 in Module 00 (module 1). That is,

```Module 1 Contains Data : 10, 50, 90, 130
Module 2 Contains Data : 20, 60, 100, 140
Module 3 Contains Data : 30, 70, 110, 150
Module 4 Contains Data : 40, 80, 120, 160 ```

Why we use Memory Interleaving? [Advantages]:
Whenever, Processor request Data from the main memory. A block (chunk) of Data is Transferred to the cache and then to Processor. So whenever a cache miss occurs the Data is to be fetched from main memory. But main memory is relatively slower than the cache. So to improve the access time of the main memory interleaving is used.

We can access all four Module at the same time thus achieving Parallelism. From Figure 2 the data can be acquired from the Module using the Higher bits. This method Uses memory effectively.

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