When this button, which is available only in electrical mode, is active, SPICE output will contain text tokens instead of the internally generated numerical node names. This provides predictability of the node names, as the internally generated node names can change if the circuit is modified. The state of this button is saved with the cell, and is set when a new cell is opened for editing.
When this button is activated via a button press, the Node Mapping panel appears. Since this button is set from the saved state in the current cell, one may have to turn the button off, then on again to bring up the panel. This panel provides control of the mapping.
The panel allows arbitrary names to be applied to the nodes. When mapping is active, the default names for the nodes that correspond to the contact terminals of the cell are the names of the terminals. The terminal names are set when the terminals are defined with the subct command, and it is also possible to name terminals from the Edit Terminals command in the Extract Menu.
Though the mapping of the current cell can be edited whenever the panel is visible, the mapped names are used in SPICE output only when the side menu button is active, or in subcells where the button was active when that cell was last edited or saved.