For the following questions on memory architecture, assume that 1K- 1024 (that is, 210) and 1M- 1024 X 1024 (that is, 22) 5. Draw the block diagrams for the following RAM main memory units a) b) c) d) 256X 8-bit RAM using 64 X 8-bit RAM chips 1024 X 16-bit RAM using 64 X 8-bit RAM chips 1M X16-bit RAM using 256K X 16-bit RAM chips 32 M X 32 bit RAM using 8MX 16 bit RAM chips A computer system has 256K words of main memory and 16K words of direct-mapped cache memory. The block size is 256 words. The access time for the main memory is 15 times that of the cache memory 6. a) What is the size of the tag field? b) If a fully associative mapping scheme were used instead, what would be size of the tag field? c) Determine the efficiency of the system assuming a cache hit ratio of 0.9 d) If the cache access time is 200 nanoseconds, what hit ratio would be required to achieve an average access time equal to 500 nanoseconds? 7. A set associative cache has a total of 128 blocks divided into sets of 8 blocks each. Main memory has 2048 blocks with 16 words per block. How many bits are needed for the tag field? 8. A computer system has 64K words of main memory and a set associative cache. The block size is 16 words and the tag field of the memory address is 5 bits. If the same cache were direct mapped, the main memory address will have a 3-bit tag field. How many words are there in the cache? How many blocks are there in each cache set