What is cache design in computer architecture?
Cache memory is an extremely fast memory type that acts as a buffer between RAM and the CPU. Cache memory is used to reduce the average time to access data from the Main memory. The cache is a smaller and faster memory which stores copies of the data from frequently used main memory locations.
What is the design principle of cache memory?
Caching works via the principle of locality of reference. Locality of reference refers to the tendency of a processor to access the same memory locations as it runs an application. Because these memory accesses are predictable, they can be exploited via caching.
What are the five main elements for cache design?
They represent the subsequent categories: Cache size, Block size, Mapping function, Replacement algorithm, and Write policy.
How is cache memory organized?
With the associative mapping of the contents of cache memory, the address of a word in the main memory is divided into two parts: the tag and the byte index (offset). The cache is divided into lines. In each line one block can be written together with its tag and usually some control bits.
What are the key design issues that are considered for cache design?
Cache Design Issues
- Block placement: where can a block be placed in the cache?
- Block replacement: which block should be replaced on a miss?
- Write strategy: what happens on a write?
- Cache parameters: e.g. block size, cache size, associativity.
What is the role of the cache?
Cache is a small amount of memory which is a part of the CPU – closer to the CPU than RAM . It is used to temporarily hold instructions and data that the CPU is likely to reuse.
What are the parameters you need to consider when designing a cache?
Important Factors in cache design are :
- Mapping function : Direct mapping , associative mapping or set associative mapping .
- Size: Large size cache have high cache hit rate and lower cache miss rate.
- Write Policy:.
What is cache mapping techniques?
Cache mapping is a technique that defines how contents of main memory are brought into cache. Cache Mapping Techniques- Direct Mapping, Fully Associative Mapping, K-way Set Associative Mapping.
Why some architectures are designed using the split cache?
The split design enables us to place the instruction cache close to the instruction fetch unit and the data cache close to the memory unit, thereby simultaneously reducing the latencies of both.
What are the types of cache?
There are two different types of cache memory: primary and secondary. Primary cache memory is found on the CPU itself whereas secondary cache memory is found on a separate chip close to the CPU.
What is cache memory in Computer Organization?
Cache Memory in Computer Organization. Cache Memory is a special very high-speed memory. It is used to speed up and synchronizing with high-speed CPU. Cache memory is costlier than main memory or disk memory but economical than CPU registers. Cache memory is an extremely fast memory type that acts as a buffer between RAM and the CPU.
How to organize cache in a CPU?
Cache is close to CPU and faster than main memory. But at the same time is smaller than main memory. The cache organization is about mapping data in memory to a location in cache. A Simple Solution: One way to go about this mapping is to consider last few bits of long memory address to find small cache address, and place them at the found address.
What is cache mapping?
This mapping is performed using cache mapping techniques. Then, the required word is delivered to the CPU. A page fault occurs. The page containing the required word is mapped from the secondary memory to the main memory. Then, the page is mapped from the main memory to the cache memory.
What is this course on cache memory?
This course is designed to give you the skills you need to answer any question on cache memory. By the end of the course you will understand cache memory topic of computer organization extremely well and be able to answer any question on cache memory.