Specifications

166 Chapter 8—Device Symbol Editing
as desired.
c See “Showing, Hiding, Editing or Moving a Pin’s Name” on page 160 for
more information.
Reordering Pins in the Pin List
Pins can be reordered in the list by simply clicking and dragging them to the
desired new position. This pin order does not affect the graphical appearance of
the symbol, but may affect netlists generated from schematics containing the
symbol. For example, the SPICE netlist format depends upon the device pin
order matching the order expected by the target simulator.
Creating a Part With a Subcircuit
This section describes how to associate a hierarchical subcircuit definition with a
part stored in a library. This is useful if the subcircuit definition will be rela-
tively unchanging and is likely to be used in a number of different designs.
Creating the Port Interface
A part's subcircuit is a schematic circuit which is associated with the part such
that it is considered to be the part contents. A circuit which is to be used as a
subcircuit must include parts called port connectors. Port connectors, which are
named, allow signals in the circuit to be associated with pins on an enclosing
part. Port connectors make this association by name, i.e.: a port connector
named “A0” will only associate with a pin with the same name.
c See “Port Interface” on page 52 for more information on the port inter-
face.
Selecting the Subcircuit
The easiest method to create a part with an associated subcircuit is to begin by
selecting the schematic circuit to be used as the subcircuit.
To select the circuit to be used as the part's subcircuit you must also define the
type of part being made. Select the Subcircuit and Part Type command from the
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