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Authors:
Linda Null ,julia Lobur
Chapter:
Memory
Exercise:
Review Of Essential Terms And Concepts
Question:10 | ISBN:9780763704445 | Edition: 3

Question

10. What are the three fields in a direct mapped cache address? How are they used to access a word located in cache?

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Answer

Cache Mapping :
The process /technique of bringing data of main memory blocks into the cache block is known as cache mapping.
The mapping techniques can be classified as :

  1. Direct Mapping
  2. Associative
  3. Set-Associative

1. Direct Mapping : 
Each block from main memory has only one possible place in the cache organization in this technique. 

The 3 fields in a direct mapped cache adress are  : Tag, Block & Word.

To map the memory address to cache  :

  • The BLOCK field of the address is used to access the cache’s BLOCK.
  • Then, the  tag bits in the address is compared with the tag of the block.
  • For a match, a cache hit occur as the required word is found in the cache. Otherwise, a cache miss occurs and the required word has to be brought in the cache from the Main Memory.
  • The word is now stored in the cache together with the new tag (old tag is replaced).

 

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