Question: 4. Cache and memory devices (10 pts) a. Consider a two-level hierarchical cache system, and the following parameters of cache and memory performance: Main memory

4. Cache and memory devices (10 pts) a. Consider a two-level hierarchical cache system, and the following parameters of cache and memory performance: Main memory access time: tmain = 50ns L1 cache access time: t1 = 5ns, hit rate h1=95% L2 cache access time: t2 = 15ns, hit rate h2=85% What is the average memory access time? (4 pts) b. Among SRAM and DRAM, what types of memory devices you should use for cache and main memory? Why? (3 pts) c.What is the definition of random access? How is random access on memory devices realized? Give an example of devices which do not support random access. (3 pts)

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