A digital computer has a memory unit of 64K X 16 and a cache memory of 1K words. The cache uses direct mapping with a block size of four words. i) How many bits are there in the tag, index, block and word fields of the address format? ii) How many bits are there in each word of cache, and how are they divided into functions? Include a valid bit. iii) How many blocks can the cache accommodate?

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