Teledyne LeCroy FlexRay Trigger, Decode and Physical Layer Test - Manual (Page 10)

The Source Setup information must be defined. The datasheet for your part should contain the information you
need to properly setup the FlexRay Trigger.
Selection of Trigger Type results in dynamic changes to the FlexRay Trigger dialog.
To select a value for any of the conditions, touch the existing value (using your finger, or use a mouse pointer) to
open the pop-up dialog box with a list of choices, and select one of the choices.
Trigger Setup Detail
Source Setup
DATA – The pop-up dialog is used to select the appropriate channel or
EXT input. Ensure these selections are made correctly for proper trigger
functionality.
Threshold – Adjust the vertical level thresholds for the trigger. FlexRay
is a tri-level signal and requires the user to set 2 voltage thresholds to
enable the oscilloscope to distinguish between 1 and 0. Much like an
Edge trigger, a user must specify the level used in order to process the
incoming signals and determine whether the desired serial data pattern is
meeting the set trigger condition. For simplicity, an automated Find
Threshold function detects and sets appropriate thresholds.
FlexRay Bit Rate Setup
The FlexRay trigger can be configured to trigger on FlexRay signals at
2.5 Mb/s, 5 Mb/s and 10 Mb/s as defined in the FlexRay specification.
Trigger Type Selection
The FlexRay trigger can be configured to trigger on simple TSS (Start),
FlexRay Frame (ID, Cycle Count, Frame Qualifiers) or FlexRay Symbols
(CID, CAS/MTS and Wakeup Pattern). Error Frame triggering is also
supported for FSS, BSS and FES, Header CRC and Payload CRC
errors. Choose a Trigger Type and the dialog changes to correspond with
your selection.
Setup Format
Select either Binary or Hexadecimal setup format. The format selected
only affects the Frame ID. The cycle count trigger is always a Decimal
value from 0 to 63; the Frame Qualifiers are always Binary with choices of
1, 0, or Don’t Care.
Toggling back and forth between the formats does not result in loss of
information (binary is used internally as the core format for all triggering
and decoding operations), though use of don’t care bits in a binary setup
results in the display of an X (for a full nibble don’t care) or a $ (for a
partial nibble don’t care).
Frame Trigger Setup
Frame ID – Enter the desired Frame ID in the field labeled Value,
touching the field brings up the keypad for data entry. Entering X signifies
Don’t Care, the default ID is XXX.
The Frame ID Condition can be set many different ways. Possible
conditions are <=, <, =, >, >=, not =, In Range of, or Out of Range. The
default setting is Equal.
If ID condition is In Range of or Out of Range, a To value must also be
given to specify the full ID range for the trigger.
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FlexRay-TDP-OM-E Rev A