Cache Mapping

Definition Cache Mapping: To determine the link between the data in the Main Memory address with the address data, when in Cache Memory.

Mapping

3 Mapping Techniques: 

1. Direct Mapping: a method of storing information for easy access on a computer.  

          

          Properties:  

• Searching process the data in the cache faster.
• Each piece of data in memory is assigned a space in the cache, which it shares with other pieces of data. 
• The data in the cache has a sequential slot number.
• If often happens "swapping" in the cache it will degrade the performance of Cache.
• Cache data is constantly being overwritten as new data is needed

2.  Associative Mapping 

          Properties:

• TAG the identity of the memory block.
• Memory address is interpreted as TAG and WORD.
• Searching Data in the Cache so slow, because the data is not cached in the sort.   
• Block data stored in the cache random and has no Slot Number. 

 3. Set Associative Mapping

  

           Properties:

• Each SET contains a number line.
• The cache is divided into a number of SET.