Teledyne LeCroy Serial Data Debug Solutions - Manual (Page 86)

Serial Data Debug Solutions
86 919586 RevA
FlexRaybus Physical Layer Measurement Parameters
The FlexRaybus option provides four measurement parameters 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.

Frame TSS Length Change - 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 1µs.
Viewing FlexRaybus Physical Layer Measurements
FlexRaybus physical layer measurements appear in the Measurement Table (just like other measurements)
directly under the waveform grid.
Refer to Accessing and Using The PROTObus MAG Supported Protocol Toolset (on page 23) for more
information.