Direct mapped cache memory complete hardware circuit.

In order to understand direct-mapped cache we will need to first partition main memory into an array where rows are called GROUP’s and columns are called TAG’s. Then we can place each group into a fixed cache line. This technique of placing a group of main memory locations into a fixed cache line is termed as Direct-mapped Cache.
 
The partition of main memory for direct mapped cache implementation is discussed below.
 
Main Memory structure for Direct- mapped CACHE

Direct memory

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With above partition we can implement a direct-mapped cache. Here we will have a fixed match of the cell from the array of main memory into a Cache tag location. Each TAG location need to match the group number in the address field. Next the content in tag memory needs to match the TAG ID. Once a match on TAG ID the data can then be fetched from the corresponding cache line.
 
For direct mapped cache memory we will need to partition address into following fields.

Direct memory

Complete hardware architecture of direct-mapped cache is discussed in next topic.

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