Teledyne LeCroy FlexRay Trigger, Decode and Physical Layer Test - Manual (Page 20)

Mask Test Display
The FlexRay TDP option allows you to verify signal integrity of the communication channel and corresponding
protocol data simultaneously as seen below. Points where the FlexRay signal intersects the mask are indicated
with red failure marks.
10 Mb/s FlexRay signal being tested on a TP1 mask
Physical Layer Measurement Parameters
The FlexRay TDP option provides four measurement parameters that are defined in the FlexRay physical layer
specification. These measurements characterize timing properties of the signal along the communication channel.
Propagation Delay
This measurement is made on two points along the communication
channel from the emitter node module to the receiver node module.
Propagation Delay characterizes the propagation time of the signal using
the first transition of the Bye Start Sequence (BSS).
Asymmetric Delay This measurement is made on two points along the communication
channel from the emitter node module to the receiver node module.
Asymmetric delay characterizes the difference in delay between rising
and falling edges.
Truncation This measurement is made on two points along the communication
channel from the emitter node module to the receiver node module.
Truncation measures the change in width of the TSS.
Jitter This measurement is made at on point, usually the receiving node
Jitter measures the change of length between the last BSS and the FSS.
This should usually be 1
μs.
20
FlexRay-TDP-OM-E Rev A