A commercial interface unit uses names different from those appearing in this text for the handshake lines associated with the transfer of data from the I/O device to the interface unit. The interface input handshake line is labeled STB (strobe), and the interface output handshake line is labeled IBF (input buffer full). A low-level signal on STB loads data from the I/O bus into the interface data register. A high-level signal on IBF indicates that the data has been accepted by the interface. IBF goes low after an I/O read signal from the CPU when it reads the contents of the data register.
(a) Draw a block diagram showing the CPU, the interface, and the I/O device, along with the pertinent interconnections between the three units.
(b) Draw a timing diagram for the handshaking transfer.
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