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The terminology for timing parameters is covered in a later chapter, but the basic concept for time multiplexed data on a bus is shown in figure beside. The two devices are alternately enabled to drive the data bus wire, allowing each to drive the bus in tum. Only one device is allowed to drive the bus at a time when it is operating correctly.
Timing diagrams are a critical method to allow accurate and unambiguous representation of the time related operations of digital circuits, which we will be using to understand and document the correct sequence of operations for microcomputer systems. Timing analysis, using these diagrams, allows the designer to determine safe and reliable limits to proper operation of the various circuits in the system. It is better to take a little more time to design a circuit correctly from the start than it is to find and fix bugs during testing. This is especially true because of the increasing cost of fixing a bug as a product progresses through production and into the field.
