Once an up/down counter begins its count sequence, it cannot be reversed.

Parallel in/parallel out registers have parallel input and output busses.

In a seven-segment LED display, the BCD must be decoded into a format that can be used to drive the decimal numeric display.

In VHDL, when we want to remember a value it must be stored in a VARIABLE.

Asynchronous counters are known as modulus counters.