6. (10 pts) A direct-mapped cache has a 64-bit address and 8M words of data ((1 word = 4 bytes). Each cache block is 64 bytes. Answer the following questions. (a) How many blocks are there in the cache? (b) How is a 64-bit memory address divided into tag, block index, and byte offset? Calculate the number of bits for each field. (c) Calculate the total size of the cache. 7. (10pts) A 8-way set associative cache has the same data size and block size as the direct-mapped cache in Question #6. (a) How many sets are there in the cache? (b) How is a 64-bit memory address divided into tag, set index, and byte offset? Calculate the number of bits for each field. (c) Calculate the total size of the cache. Value