Consider a direct-mapped cache with 256 lines. If the block size is 16 words and the main memory size is 64K words. find the minimum number of bits for each field of the memory address. W= bits r (line index) = bits Tag = bits Given the following sequence of 16-bit memory address references in Hexadecimal: 4E20, 4E24, 4E28, 4E30, 5E2C, 5E30, 5E34, 5E38 Starting with an empty cache, find the hit ratio? Hit Rati = %