Importance Of Cache Memory
What is Cache memory?
Cache memory Pronounced cache-a special high-speed storage machinery. Cache can be either kept in section of main memory or an independent high-speed storage device a system with the cache. In this system, every time the CPU perform a read or write, the cache may possibly be the bus operation allowing the cache to decrease the reply time of the system. Before talking about this cache model some of the regular conditions used when we talk about cache.
Cache Hits:
When the cache contains the information requested the operation is said to be a cache memory.
Cache Miss:
When the cache does not have the information requested, the operation is said to be a cache miss.
Cache stability:
Since cache is a photo or copy of a small piece of main memory, it is important that the cache always reflects what is
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Importance of cache memory:
The cache memory lies in the pathway between the processor and memory. The cache memory has smaller access time then memory and it is faster than the main memory. A cache memory has an access time of 1 hundred ns, while the main memory may have an access time of Seven hundred (700) ns.
The cache memory is very costly and hence it is limited in capacity. Earlier cache memories were available individually but the microprocessors hold the cache memory on the chip itself.
The need for the cache memory is due to the inequality between the speeds of the main memory and the central processing unit. The central processing unit clock as discussed earlier it is very fast, but the main memory access time is fairly slower. Hence, no matter how fast the processor is, the processing speed depends more on the speed of the main memory. It is because of this reason that a cache memory have access time nearer to the processor speed is
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