Specifications

239
Appendix B—
Device Pin Types
Every device pin has a characteristic known as its pin type. The pin type is
set when the part entry in the library is created and cannot be changed for
individual device pins on the schematic.
 Refer to Chapter 11, Device Symbol Editing, for information on how
to set the pin type while creating a device symbol.
What Pin Types Are Used For
For many general schematic editing purposes, the pin type will be unim-
portant and can be ignored. However, pin type settings are important in the
following cases:
 The pin type of each pin is used by the simulator to select what type of
output values are generated by a pin. For example, an open collector
output will not generate a HIGH drive level.
 Pin type information is required in many netlist file formats for FPGA
layout and digital simulation.
 Other analysis tools may, in the future, use this information for timing
and loading analysis.
LW Reference.bk Page 239 Monday, December 15, 2003 5:59 PM