Technical data

Trigger Commands 33
Agilent Infiniium 9000 Series Oscilloscopes Programmer's Reference 1007
Advanced State Trigger Commands
Logic triggering is similar to the way that a logic analyzer captures data.
This mode is useful when you are looking for a particular set of ones and
zeros on a computer bus or control lines. You determine which channels
the oscilloscope uses to form the trigger pattern. Because you can set the
voltage level that determines a logic 1 or a logic 0, any logic family that
you are probing can be captured.
There are two types of logic triggering: Pattern and State. The difference
between pattern and state triggering modes is that state triggering uses
one of the oscilloscope channels as a clock.
Use state triggering when you want the oscilloscope to use several
channels as the trigger source, with one of the channels being used as a
clock waveform.
The State trigger identifies a trigger condition by looking for a clock edge
on one channel and a pattern on the remaining channels. A pattern is a
logical combination of the remaining channels. Each channel can have a
value of High (H), Low (L) or Don't Care (X). A value is considered a High
when your waveform's voltage level is greater than the trigger level and a
Low when the voltage level is less than the trigger level. If a channel is set
to Don't Care, it is not used as part of the pattern criteria. You can select
the clock edge as either rising or falling.
The logic type control determines whether or not the oscilloscope will
trigger when the specified pattern is found on a clock edge. When AND is
selected, the oscilloscope will trigger on a clock edge when input
waveforms match the specified pattern. When NAND is selected, the
oscilloscope will trigger when the input waveforms are different from the
specified pattern and a clock edge occurs.
Available trigger conditioning includes HOLDoff and HYSTeresis (Noise
Reject).
Set the Mode
Before Executing
Commands
Before you can execute the :TRIGger:ADVanced:STATe commands, set the
mode by entering:
:TRIGger:MODE ADVanced and
:TRIGger:ADVanced:MODE STATe
To query the oscilloscope for the advanced trigger mode, enter:
:TRIGger:ADVanced:MODE?
The :TRIGger:ADVanced:STATe commands define the conditions for the
State Trigger Mode. As described in the following commands, you set up
the :TRIGger:ADVanced:STATe commands with the following commands and
queries:
• ":TRIGger:ADVanced:STATe:CLOCk" on page 1009