User Guide

Chapter 10 Preparing Your Design for Board Layout
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Layout Mapping Files
When creating layout netlists, PSpice Schematics uses
mapping files. These files let you customize the handling
by the layout netlister of part, net, and package type
names. Mapping files are text files that you can edit with
any text editor. PSpice Schematics is shipped with
mapping files containing defaults and sample entries.
Mapping files exist for each of the supported layout
formats.
• <layout format>.xmp
Contains rules for creating entries in the parts list
section of the netlist. If the part names used in
PSpice Schematics are different than the names
used in the layout package, you can specify the
substitution to be done.
• <layout format>.xnt
Contains name mappings for nets. For example, in
PSpice Schematics the default power net on some
digital parts is named $G_DPWR, while in most
layout systems it is +12V.
• <layout format>.xpk
Contains name mappings for package types. For
example, in PSpice Schematics a package type is
called TO33, and in the layout editor it is TO-33.