User`s guide

Definin
g
Symbol Attributes Needed for Simulation 5
-19
MODEL
The MODEL attribute defines the name of the model that
PSpice A/D must use for simulation. When defining this
attribute, this rule applies:
• The MODEL name should match the name of the .MODEL
or .SUBCKT definition of the simulation model as it
appears in the model library (
.lib).
Example: If your design includes a 2N2222 bipolar transistor
with a .MODEL name of Q2N2222, then the MODEL attribute
for that part’s symbol should be Q2N2222.
Note
Make sure that the model library containin
g
the
definition for the assi
g
ned model is confi
g
ured into
the model library. See
Configuring Model Libraries
on page 4-41 for more information.
SIMULATION ONLY
The SIMULATION ONLY attribute indicates that the part or
special symbol applies only to simulation with PSpice A/D.
Parts like voltage sources, current sources, breakout parts (like
RBREAK found in
breakout.slb), and simulation control
symbols (like VIEWPOINT found in
special.slb) have the
SIMULATION ONLY attribute. This attribute does not require
a value.
To find out more about this attribute... See this...
MODEL page
5-19
SIMULATION ONLY page
5-19
TEMPLATE page
5-20
IO_LEVEL page
5-27
MNTYMXDLY page
5-28
IPIN(xxx) page
5-29
When in the schematic editor,
you cannot edit the MODEL
attribute directly throu
g
h the
Attributes dialo
g
box. Instead,
you must chan
g
e the MODEL
assi
g
nment usin
g
the Model
command from the Edit menu
and then either:
• chan
g
e the model reference
to an existin
g
model
definition, or
• create a new instance model.
The schematic editor
automatically assi
g
ns the
resultin
g
model name to the
MODEL attribute.
You can also edit the underlyin
g
model for a symbol from within
the symbol editor, usin
g
the
Model command from the Edit
menu.
For more information on model
editin
g
in
g
eneral, see Chapter
4,Creating and Editing Models.
For specific information on
chan
g
in
g
model references, see
Changing the Model Reference
to an Existing Model Definition
on page 4-38.