A computer has an average main memory access time of 60 ns. We want to reduce this time to 20 ns by adding a cache, Determine how fast the cache must be (hit time) if we can expect a 90% hit rate of the cache, Show all your work-to get full credit. (Hint: Average memory access time equation)

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Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.