Tektronix DPO2012B User Manual

Trigger Setup
11. If you are setting up an LIN trigger and
have made a Trigger On selection of
Identifier, Da
ta,orIdentifier & Data,push
the lower-bezel Identifier or Data buttons
and enter the parameters of interest on the
resulting si
de-bezel menu.
If you have made a Trigger On selection
of Error, push the lower-bezel Error Type
button and en
ter the parameters of interest
on the resulting side-bezel menu.
I
2
C, SPI, CAN, and LIN Bus Trigger Data Matching
Rolling window byte matching for I
2
C, and SPI. To use a rolling window to trigger on data, you d efine the number
of bytes to m atch. Then the oscilloscope uses a rolling window to find any match within a packet, with the window rolling
one byte at a time.
For example, if the number of bytes is one, th e oscilloscope will attempt to match the first byte, second byte, third, and so
on within the packet.
If the number of bytes is two, the oscilloscope will try to match any two consecutive bytes, such as one and two, two and
three, three and four, and so on. If the oscilloscope finds a match, it will trigger.
Specific
byte matching (non-rolling window matching for a specific position in the packet) for I
2
C, SPI,
and CAN.
You can trigger on a specificbyteforI
2
C, SPI, and CAN in several ways:
For I
2
C and SPI, enter the number of bytes to m atch the number of bytes in the signal. Then use don't cares (X) to
mask the bytes that you are not interested in.
For I
2
C, push the lower-bezel Trigger On to trigger on Address/Data. Push Address. On the side-bezel menu, push
Addres
s, and turn multipurpose knobs a and b as needed. Set the address to don't cares (X) if you want to mask the
address. The data will be matched starting at the first b yte without using a rolling window.
For CAN, triggering occurs when the user-selected data input matches the data and qualifier in the signal starting at
the first byte. S et the number of bytes to match the number of bytes of interest. Use the data qualifier to perform: =,
!=, < ,
>, >=, and <= operations. Triggering on identifier and data always matches the identifier and data selected by
the user, w ith the data starting at the first byte. No rolling window is used.
RS-232 Bus Trig ger Data Matching
You can trigger on a specific data value for R S-232 bytes. If you defined an end-of-packet character to use for RS-232 bus
decoding, you can use the same end-of-packet character as a data value for trigger data matching. To do so, choose the Tx
End of Packet or the Rx End of Packet character as the Trigger On selection.
ParallelBusTriggerDataMatching
Optimum parallel bus trigger performance is achieved by using only analog channels or only digital channels
(MSO2000B series only).
74 MSO2000B and DPO2000B Series Oscilloscopes User Manual

Tektronix DPO2012B Specifications

General

Brand	Tektronix
Model	DPO2012B
Category	Test Equipment
Language	English