cache memory

what is 4 way set  associative cache mapping .  
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Here are some links that might help: (the description is near the end, in section 3.2, though you should read 3.1 first).
The organization of cache memeory in the 486 and Pentium class is called 4 way set associative cache. Which means cache is split into four blocks. Each block is also  organized as 128 or 256 lines of 16 bytes each.
Basically its like using a bookmark in a book.
Each of the four blocks stores different lines of memory this is esppecially important in the windows environment where the processor has to operate on different areas of memory simultaneously.

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