These digital components are templates for describing arbitrary logic using the d_chip digital device, which allows you to specify combinational and sequential logic using text in a table-like format.

Refer to the Digital Chip section for complete information about the d_chip digital device.

The modeling is done directly in the .model statement in the Edit Model dialog box.

The default model for the components is a combinational model based on a truth table, created using the /table command.

The d_chip device requires you to include the logical behavior for every pin. These must be listed in the /inputs and /outputs commands. However, you can use “don't care” (X) states to simplify the description of the model, especially if the pins are not used by the external circuit.