Cooper LP800 Guia do Utilizador Página 415

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14
-
22 Di
g
ital Simulation
Initializin
g
Flip-Flops
To initialize all flip-flops and latches
1
Select one of the three Flip-flop Initialization choices in the
Digital Setup dialog box.
If set to X, all flip-flops and latches produce an X
(unknown state) until explicitly set or cleared, or until a
known state is clocked in.
If set to 0, all such devices are cleared.
If set to 1, all such devices are preset.
Startin
g
the Simulation
To start the simulation
1
From the Analysis menu, select Simulate to initiate
PSpice A/D.
If PSpice A/D successfully completes the simulation, then (by
default) Probe automatically starts.
Refer to the online MicroSim
PSpice A/D Reference Manual
for more information about flip-
flops and latches.
Note that the X initialization is the
safest
settin
g
, since many
devices do not power up to a
known state. However, the 0 and
1 settin
g
s are useful in situations
where the initial state of the flip-
flop is unimportant to the function
of the circuit, such as a to
gg
le
flip-flop in a frequency divider.
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