Specifications

Device Simulation Characteristics 73
primitive types as well as subcircuit devices. The following table summa-
rizes the level mappings that occur.
NOTE: 1) The logical inversion of the pin is completely independent of the
graphical representation of the pin. For example, using the “inverted pin”
graphic in the DevEditor does not invert the pin logic in the simulator. You
must set the Invert.Pin field to have this effect.
2) Although pin inversion can be specified independently for each device
on the schematic, we do not recommend modifying these settings after a
device has been placed on the diagram. This can create the confusing
situation of two devices with the same name and symbol but different
logical characteristics.
See also:
 “Pin Delays and Inversion” on page 80, for information on pin
inversion in subcircuit blocks.
 Chapter 9, Primitive Devices, for information on how pin inversion can
be used with specific primitive types.
 Chapter 11, Device Symbol Editing, for procedures for setting pin
attributes when creating a symbol.
External Signal
Value
Internal Signal Value
LOW.H HIGH.H
LOW.L HIGH.L
HIGH.H LOW.H
HIGH.L LOW.L
All others Unchanged
LW Reference.bk Page 73 Monday, December 15, 2003 5:59 PM