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What is difference between write through mode and copy back mode?

Latest Updated:03/23/2009

Question:

What is difference between write through mode and copy back mode?

Answer:

There are 2 modes in the cache. Differences are as follows.

(1) Copy back mode

For example, writing to hit cache entry is performed but writing to external SDRAM is not performed if the cache is hit when writing to external SDRAM.

(2) Write thorough mode

For example, writing to hit cache entry and external SDRAM is performed if the cache is hit when writing to external SDRAM.

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