(3) In a personal computer, a disk controller is typically used to transfer a stream of bytes from a floppy disk drive to a memory buffer with the help of a host such as the central processing unit (CPU) or a direct memory access(DMA) controller. Figure E5.2 shows a partially completed and simplified state diagram for the control of the data transfer.

            The controller signals the host each time a new byte is available. The data must then be read and stored before another byte is ready. When the disk controller senses the data has been read, it indicates that data is not available, in preparation for the next byte. If any byte is not read before the next one comes along, the disk controller asserts a data lost error signal until the disk controller is reset. Add the following to the diagram: reset, indicate data not available, indicate data available, data read by host, new data ready, indicate data lost.

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