Question: A keypad is to interfaced with a computer. The keypad has a 4 - bit output K representing the encoding of the key that was

A keypad is to interfaced with a computer. The keypad has a 4-bit output K representing the encoding of the key that was pressed and a single-bit output E that changes from 0 to 1 when a key is pressed. The computer has a corresponding 4-bit input CK, which is the key value at the front of the queue, and a single bit input to the computer CE, where CE=1 indicates that CK is valid.

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