User`s guide

3
-
26 Preparin
g
a Schematic for Simulation
Usin
g
VSRC or ISRC s
y
mbols
The VSRC and ISRC symbols have one attribute for each
analysis type: DC, AC, and TRAN. You can set any or all of
them using PSpice netlist syntax. When you give them a value,
the syntax you need to use is as follows.
Note
MicroSim recommends that if you are runnin
g
only
a transient analysis, use a VSTIM or ISTIM symbol
if you have the standard packa
g
e, or one of the
other time-based source symbols that has
attributes specific for a waveform shape.
Di
g
ital Stimuli
This
attribute...
Has this syntax...
DC
DC_value[units]
AC
magnitude_value[units] [phase_value]
TRAN
time-based_type (parameters)
where
time-based_type
is
EXP
,
PULSE
,
PWL
,
SFFM
, or
SIN
, and the
parameters
depend on the
time-based_type
.
If you want this kind of input...
Use this
symbol....
For transient analyses
signal or bus (any width) DIGSTIM
*
signal or bus (any width) at interface ports IF_IN*
INTERFACE*
clock signal DIGCLOCK
1-bit signal STIM1
4-bit bus STIM4
8-bit bus STIM8
16-bit bus STIM16
file-based signal or bus (any width) FILESTIM
For the syntax and meanin
g
of
transient source specifications,
refer to the I/V (independent
current and volta
g
e source)
device type in the
Analo
g
Devices
chapter in the online
M
icroSim PSpice A/D Reference
M
anual.
You can use the DIGSTIM,
IF_IN, and INTERFACE symbols
to define both 1-bit si
g
nal or bus
(any width) input si
g
nals usin
g
the Stimulus Editor; double-click
the symbol instance to start the
Stimulus Editor.
See
Defining a Digital Stimulus
on page 14-5 to find out more
about:
• all of these source symbols,
and
• how to use the Stimulus
Editor to specify DIGSTIM,
IF_IN, and INTERFACE
symbols.