One of the first steps in any HDL project is to define its scope by naming each input and output.

More Questions from Digital System Projects Using HDL

• 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.
• In the digital clock project, the ENT input and RCO output can be used for synchronous counter cascading.
• In the digital clock project, when it is 11:59:59, AND gate 1 detects that the tens of hours is 1 and the edge trigger clock moves the display to 12:00:00.
• In the keypad HDL encoder, after releasing a key the ring counter resumes its counting sequence.

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