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PSpice User Guide Mixed analog/digital simulation October 2019 651 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Interface generation and node names The majority of the interface generation process involves PSpice A/D determining whether analog and digital primitives are connected, and if so, inserting an interface subcircuit for each digital connection. This turns the interface node into a purely analog node, which now connects to the analog terminal of the interface subcircuit. To complete the original connection, PSpice A/D creates a new digital node between the digital terminal of the interface subcircuit and the digital primitive. Because PSpice A/D must create new digital nodes, it must give them unique names. These node names are used in the output variables in the list of viewable traces when you choose Add Trace from the Trace menu. Name generation follows these rules: ■ The analog node retains the name of the original interface node—either the labeled wire name in the design, or the node name automatically generated for an unlabeled wire. ■ Each new digital node name consists of the labeled wire name in the design or the node name automatically generated for an unlabeled wire, appended with $AtoD or $DtoA. If the node is attached to more than one digital part, the second digital node is appended with $AtoD2 or $DtoA2, and so on. Figure 15-1 below shows a fragment of a mixed analog/digital circuit before and after the interface subcircuits have been added. The wires labeled 1 and 2 in the schematic representation are the interface nets connecting analog and digital parts. These translate to interface