This diagram illustrates the sequence of events that occur in a computer system as it processes instructions. It shows the timing of the various components of the system, including the CPU, memory, and input/output devices. It also shows the order in which instructions are executed and the amount
From Wikipedia
A digital timing diagram represents a set of signals in the time domain. A timing diagram can contain many rows, usually one of them being the clock. It is a tool commonly used in digital electronics, hardware debugging, and digital communications. Besides providing an overall description of the timing relationships, the digital timing diagram can help find and diagnose digital logic hazards.