Memory Interleaving

Last Updated : 21 Apr, 2026

Memory Interleaving is a technique used to increase the speed of memory access by splitting memory into multiple modules (banks) and accessing them in parallel.

  • Instead of storing the entire block of data in a single module, memory addresses are distributed across multiple modules in a round-robin fashion.
  • This allows the CPU to fetch the next instruction/data while the previous one is still being accessed, improving throughput.

Need for Memory Interleaving

  • CPU executes instructions much faster than memory can supply data (memory bottleneck problem).
  • Without interleaving, CPU must wait for each memory access to complete.
  • Interleaving ensures that while one module is busy, the CPU can access another, reducing wait time.

Consecutive Word in a Module: 

Explanation:

  • 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 & the 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. 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: 

Explanation:

  • Now again we assume 16 Data values 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. 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

Benefits of Memory Interleaving

  • Higher Bandwidth: Multiple memory banks work in parallel, so more data can be transferred at once.y. 
  • Lower Latency: While one bank is busy, others get ready, reducing wait time.
  • Better Performance: Together, higher bandwidth and lower latency make the system faster and more efficient, especially for heavy tasks and multitasking.
Comment

Explore