One CASE construct inside another CASE construct is called a do-loop.

More Questions from Digital System Projects Using HDL

• In HDL when a circuit is simulated on a computer, the designer must create all the different scenarios that will be experienced by the actual circuit and must also know the proper response to those inputs.
• The wave-drive sequence of a stepper motor has more torque and operates more smoothly than the full-step sequence at moderate speeds.
• One of the first steps in any HDL project is to define its scope by naming each input and output.
• In HDL, one of the strategies used in strategic planning is to find a way to test each piece of the project.
• Top-down design means that we start at the highest level of the hierarchy, or that the entire project is considered to exist in a closed dark box with inputs and outputs.
• A very critical dimension in project management is the time your boss will give you to complete the HDL project.
• In the keypad HDL encoder, NANDing of the columns is used to activate the freeze bit.
• In the keypad HDL encoder, the ts bit array represents a tristate buffer.
• In the digital clock project, a MOD-60 BCD counter is made from a MOD-10 counter cascaded to a MOD-6 BCD counter.
• In the keypad HDL encoder, as long as all columns are high the ring counter is enabled and counting.

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