7 PICOSCALE CONTROL GUI
• NAND or NOT AND The output becomes LOW if both inputs are HIGH. In all other cases, the
output is HIGH.
• XOR The output becomes LOW if both inputs are simultaneously HIGH or simultaneously
LOW. In all other cases, the output is HIGH.
• NXOR or NOT XOR The output becomes HIGH if both inputs are simultaneously HIGH or
simultaneously LOW. In all other cases, the output is LOW.
NOTICE
If you simply want to pipe through a trigger source as a trigger output signal,
select the corresponding trigger source in the AND Mask, do not select anything
in the OR Mask (so that its output is always LOW) and combine the two masks by
an OR operation in the Logic Operation.
Finally, you have to configure the Output Mode and Output Delay of your trigger signal. Some trigger
sources simply create short pulses or the trigger condition may be subject to high frequency state
changes. In order to debounce or widen the pulses you can select an appropriate Output Mode
as well as an Output Delay. The
PICOSCALE offers four different Output Modes, which are also
illustrated in figure 7.12:
• Immediate No Reset: In this mode the output control logic forwards a change of the trigger
state immediately and the state is kept stable for the configured delay.
• Immediate Reset: In this mode the output control logic forwards a change of the trigger
state immediately and the state is kept stable for the configured delay. A state change during
this delay resets the delay counter.
• Delayed No Reset: In this mode the output control logic starts a delay counter when the
trigger state changes. State changes during this delay are ignored. At the end of the delay
the current state is forwarded.
• Delayed Reset: In this mode the output control logic starts a delay counter when the trigger
state changes. State changes during this delay are ignored, but cause the delay counter to
be reset. At the end of the delay the current state is forwarded.
Note that the output mode only takes effect when a non-zero output delay is configured. When
the output delay is set to zero (default), the resulting trigger signal is identical to the input signal.
The output modes are divided into two categories, Immediate and Delayed. Immediate performs a
state change of the trigger output immediately after a state change of the input signal is recorded.
Delayed on the other hand keeps the current trigger state and waits for a certain time until the
trigger output reacts on an input signal state change.
The subcategories Reset and No Reset determine how the entered Output Delay is taken into ac-
count by the trigger system. Once a state change of the input signal is recorded, a delay counter is
started. In the No Reset case this counter runs independently of the input signal, thus deactivating
the trigger output for a fixed time. In case of Reset, the delay counter is restarted every time the
input signal changes its state. Thus, this mode guarantees that the trigger output remains in its
current state until the input signal is stable for the defined Output Delay time.
61
PicoScale User Manual
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