Specifications

118 Chapter 6—Primitive Devices
One Shot
The One Shot is used to generate an output pulse of a fixed length when it
is triggered by the rising edge of the trigger input. Two parameters can be
set for a One Shot: the delay from the rising edge of the input to the start of
the output pulse, and the duration of the pulse. The delay and duration
times are initially set to 1 and 10, respectively, but can be modified using
the Windows Simulation Params item on the Simulation menu.
The One Shot device is retriggerable, meaning that the output pulse will
not end until duration time units have passed since the last trigger input.
Repeating the trigger input can cause the output pulse to be extended indef-
initely.
Setting One Shot Values
To set the delay and duration times for a One Shot, first select the device in
question, then choose the Simulation Params item in the Simulation menu.
 Refer to Chapter 12, Menu Reference, for more information on the
Parameters command.
I/O Simulation Pseudo–Devices
Binary Switch
The Binary Switch device provides a means for setting a signal to a low or
high level. When a switch is first created, its output is at a low level. Acti-
vating the arrow cursor and clicking on the switch causes the switch arm to
move and the output to change to the opposite state. Any number of device
inputs can be driven by a switch output. A switch has no delay characteris-
tic since it has no inputs.
To select a switch device, rather than change its state, hold down the
key on the keyboard while clicking on the device.
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