Terminals Tab (Edit Component)

Use the Terminals tab to associate each symbol pin with the proper terminal. First order the symbol pins, then select the corresponding symbol; you can then visually associate the symbol pins with the netlist properties for the simulation model. The symbol preview window at the bottom of the dialog box reflects your changes.

You can select one or more terminals directly, enabling the following settings:

• Order Symbol Pins – Displays the terminals present in the symbol definition. These are ordered as they are written in the netlist for the corresponding model terminals. You can modify the order.
• Model Pins – Displays the terminals present in the model definition. The order is defined in the model text and is fixed in the user interface.
• Nature – Select the physical type (electrical, magnetic, and so on) associated with the pin.
• Unconnected – Select a corrective action if the pin remains unconnected.
• Unconnected/default behavior – Controls what Twin Builder does at analysis time if this pin is left unconnected in a schematic. The options are:

• Flag as error – Results in the generation of netlist errors in the Message Manager pane.

• Unique net – Writes a unique netname (for example, “unconnected0”) for the unconnected pin. This allows connections in a multi-element netlist line even when the pins of the component are unconnected.

• Grounded – Assigns a user-specified R to ground value (see below).

• No net – Results in assignment of an empty string when netlisting the terminal.

Click Apply to selection to apply your choice to the selected pin.

• R to ground (Ohms) – If you select Grounded for the Unconnected/default behavior, you can specify the resistance to ground within the R to Ground entry window. The default value is 1e9 (Ohms). Click Apply to selection to apply your changes to the selected terminals.

Definition Parameter Tabs

The Definition Parameter area displays the signal, quantity, and parameter properties in a pane as:

• Name – Property name.
• Value – Property value.
• Unit – Units of the property value.
• Has Pin – Indicates whether the property has a pin.

You can also add and modify definition parameters with the Parameter Selection dialog box.

Click OK to save your changes and close the dialog box; click Cancel to close the dialog box without saving any changes.