User`s guide

Definin
g
Symbol Attributes Needed for Simulation 5
-29
IPIN attributes
IPIN attributes define the net name to which a hidden (invisible)
pin is connected. Whenever you define a hidden pin for a
symbol, the symbol editor automatically creates an IPIN
attribute.
The naming convention for IPIN attributes is
IPIN(xxx)
where xxx is the name of the pin.
If
y
ou are creatin
g
a di
g
ital part,
y
ou need to do
the followin
g
1
For each IPIN attribute, assign the name of the digital net to
which the pin is connected.
Example: If power (PWR) and ground (GND) pins of a
digital part connect to the digital nets $G_DPWR and
$G_DGND, respectively, then the IPIN attributes for this
symbol are:
IPIN(PWR)=$G_DPWR
IPIN(GND)=$G_DGND
2
Use the appropriate hidden pin name in the TEMPLATE
attribute definition.
Example: If the name of the hidden power pin is
PWR
and
the name of the hidden ground pin is
GND
, then the template
might look like this:
TEMPLATE=X^@REFDES %A %B %C %D %PWR %GND
@MODEL PARAMS:\n+
IO_LEVEL=@IO_LEVEL
MNTYMXDLY=@MNTYMXDLY
Hidden pins are typically used for
power and
g
round on di
g
ital
parts.
Note
For clarity, the
TEMPLATE attribute value is
shown here in multiple lines;
in a symbol definition, it is
specified in one line (no line
breaks).