Rohde & Schwarz RTE - CXPI (Option R&S RTE-K76); Searching Spacewire; The CXPI Protocol

Protocol analysis
R&S
®
RTE
877User Manual 1326.1032.02 ─ 20
13.18.5.3 Searching SpaceWire
Prerequisite: A serial bus is configured for the SpaceWire signal to be decoded and
analyzed.
The search for events is set up in the following way:
1. Press [SEARCH] or tap "Search" > "Setup" in the menu bar.
2. If the dialog box does not contain a search entry, tap the "Add" icon to create one,
as described in "To create a user-defined search" on page 460.
3. Tap "Source" and select the serial bus that is set to SpaceWire (e.g. "SB1", unless
already selected).
4. Specify search criteria according to Chapter 13.18.5.1, "SpaceWire search setup",
on page 873.
5. To acquire a waveform, press [RUN N× SINGLE].
The R&S RTE performs a SpaceWire decode according to the thresholds and pro-
tocol settings of the associated serial bus source.
6. To start searching the acquired waveform for specific events, tap "Enable" in the
search setup dialog:
The R&S RTE displays the "Search Results" box that lists the detected events.
For information on how to configure the search results presentation and how to navi-
gate the search results, see also "To display search zoom windows" on page 466 and
"Navigating search results" on page 447.
13.19 CXPI (option R&S RTE-K76)
The Clock Extension Peripheral Interface (CXPI) protocol defines a communication
standard for the vehicles electric system. It is developed by the Society of Automotive
Engineers of Japan, Inc. (JSAE).
13.19.1 The CXPI protocol
This chapter provides an overview of the protocol characteristics, frame types and
frame fields.
CXPI characteristics
Main characteristics of CXPI are:
●
Carrier Sense Multiple Access (CSMA) and Collision Resolution (CR)
●
The master sends pulse width modulated clock (PWMC)
●
Support of the sleep/wake function to reduce power consumption
CXPI (option R&S
RTE-K76)