Right-click a Device Model or Device Model Feature node and choose Device Equations () from the Devices submenu.

Fill in the table with Left-hand side and Right-hand side of an arbitrary number of Device Equations. You can use any device variable, device input, or device constant in these equations. If you want to use nondevice variables, add a scope specifier to the variable.

Assume for example that you want to use the variable A declared by a variable declaration in a device equation. In an ordinary expression you just type A, but in a device equation, the parser assumes that this is a device variable named A. Instead you type phys.A to specify that this is a variable outside the device context.

For valid entries in the Dimension column, see Variable Declaration.