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Logic is sequential if outputs at a specified time are a function of the inputs at that time and at all preceding times. All sequential circuits must include one or more registers. State machines are especially useful for implementing sequential logic. Other examples of sequential logic are counters, shift registers, and controllers.

Sequential logic is implemented in VHDL with Process Statements. These statements direct the Compiler to create logic circuitry that is controlled by the Process Statement's clock signal.

This section includes the following topics:

• Implementing Registers
• Implementing Counters
• Implementing Latches
• Implementing State Machines
  • Automatically Specifying State Assignments
  • Manually Specifying State Assignments
    

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