Embedded System Cache Memory MCQ Quiz – Objective Question with Answer for Embedded System Cache Memory

The cache memory is a small random access memory that is faster than a normal RAM. It has a direct connection with the CPU otherwise, there will be a separate bus for accessing data. The processor will check whether the copy of the required data is present in the cache memory if so it will access the data from the cache memory.

The proportion of accesses of data that forms the cache hit, which measures the effectiveness of the cache memory.

The size of the cache increases and a large amount of data can be stored, which can access more data which in turn increases the hit rate of the cache memory.

The translation lookaside buffer is common to cache memory seen in almost all CPUs and desktops which are a part of the memory management unit. It can improve the virtual address translation speed.

The set associativity is a criterion that describes the number of cache entries that could possibly contain the required data.

The 8086 processor has a 64 Kbytes cache, beyond this size, the cost will be extremely high.

The direct-mapped cache only has one possibility to fetch data whereas, in a two-way system, there are two possibilities, for a three-way system, there are three possibilities, and so on. It is also known as the one-way set-associative cache.

The direct-mapped cache has the advantage of allowing a simple and fast speculative execution.

The cache line refers to the number of consecutive bytes which are associated with each cache entry. The data is transferred between the memory and the cache in a particular size which is called a cache line.

The cache performance is completely dependent on the system and software. In software, the processor checks out each loop and if a duplicate is found in the cache memory, immediately it is accessed.