A pair of signals Request (R) and Acknowledge (A) is used to coordinate transactions betwe...

A pair of signals Request (R) and Acknowledge (A) is used to coordinate transactions between a CPU and its I/O system. The interaction of these signals is often referred to as a “handshake.” These signals are synchronous with the clock and, for a transaction, are to have their transitions always appear in the order shown in Figure. A handshake checker is to be designed that will verify the transition order. The checker has inputs, R and A, asynchronous reset signal, RESET, and output, Error (E). If the transitions in a handshake are in order, E = 0. If the transitions are out of order, then E becomes 1 and remains at 1 until the asynchronous reset signal (RESET = 1) is applied to the CPU.

(a) Find the state diagram for the handshake checker.

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(b) Find the state table for the handshake checker.

Figure Signals for Problem