Trigger Setup
Speci
fi
c byte matching (non-rolling window matching for a speci
fi
c position in the packet) for I
2
C, SPI,
USB, CAN, and FlexRay.
You can trigger on a speci
fi
c byte for I
2
C, SPI, CAN, and FlexRay in several ways:
For I
2
C and SPI, enter the number of bytes to match 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
Address
, and rotate 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
fi
rst byte without using a rolling window.
For USB, triggering occurs when the user-selected data input matches the data and quali
fi
er in the signal starting at
the byte offset. Set the number of bytes to match the number of bytes of interest. Use the data quali
fi
er to perform: =,
!=, <, >, >=, and <= operations.
For CAN, triggering occurs when the user-selected data input matches the data and quali
fi
er in the signal starting at
the
fi
rst byte. Set the number of bytes to match the number of bytes of interest. Use the data quali
fi
er to perform: =,
!=, <, >, >=, and <= operations. Triggering on identi
fi
er and data always matches the identi
fi
er and data selected by
the user, with the data starting at the
fi
rst byte. No rolling window is used.
For FlexRay and Ethernet, triggering occurs when the user-selected data input matches the data and quali
fi
er in the
signal starting at the byte offset. Set the number of bytes to match the number of bytes of interest. Use the data quali
fi
er
to perform: =, !=, <, >, >=, and <= operations. Triggering on identi
fi
er and data always matches the identi
fi
er and data
selected by the user, with the data starting at the
fi
rst byte. No rolling window is used.
Data Value Matching
You can trigger on a speci
fi
c data value for RS-232 bytes. If you de
fi
ned 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.
You can also trigger on a speci
fi
c data value for other buses.
Parallel Bus Trigger Data Matching
Optimum parallel bus trigger performance is achieved by using only analog channels or only digital channels.
Checking Trigger Settings
To quickly determine the settings of some
key trigger parameters, check the Trigger
readout at the bottom of the display. The
readouts differ for edge and the advanced
triggers.
1.
Trigger source = channel 1.
2.
Trigger slope = rising.
3.
Trigger level = 0.00 V.
Edge trigger readout
90
MDO4000 Series Oscilloscopes User Manual
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Страница 11: ...Table of Contents iv MDO4000 Series Oscilloscopes User Manual...
Страница 19: ...Preface xii MDO4000 Series Oscilloscopes User Manual...
Страница 215: ...Appendix C P6616 General Purpose Logic Probe Information 196 MDO4000 Series Oscilloscopes User Manual...