ISO 20794-7-2020 PDF

Full title and description

ISO 20794-7:2020 — Road vehicles — Clock extension peripheral interface (CXPI) — Part 7: Data link and physical layer conformance test plan. This part of ISO 20794 defines conformance test plans and associated procedures for verifying CXPI implementations at the data link and physical layers and for validating error-detection behavior.

Abstract

This standard specifies conformance test plans for the CXPI data link layer and the CXPI physical layer, including tests related to error detection and the operational concept of conformance test plan execution. It is intended to provide repeatable, documented test cases and pass/fail criteria for implementers and test laboratories.

General information

• Status: Published.
• Publication date: 2020-10 (October 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.040.15 (Car informatics / On-board computer systems).
• Edition / version: Edition 1 (2020-10).
• Number of pages: 132.

Scope

ISO 20794-7:2020 provides the conformance test plan framework and specific test cases needed to verify that CXPI implementations conform to the data link and physical layer requirements defined in the CXPI specification. The scope includes error-detection conformance and the description of how conformance test plans are to be operated and interpreted.

Key topics and requirements

• Conformance test plans and test cases for the CXPI data link layer (frame handling, arbitration and acceptance filtering).
• Conformance test plans for the CXPI physical layer (signalling, timing, waveform, termination and physical-media related checks).
• Error-detection and CRC-related test procedures and pass/fail criteria.
• Procedures to exercise collision resolution, content-based arbitration and timing-sensitive behaviors typical of CXPI networks.
• Electrical and signalling tests that align with CXPI PHY requirements (signal shaping, clock generation and physical-media attachment checks).
• Documentation, test operation concept and reporting formats to ensure repeatable laboratory verification.

Typical use and users

Used by automotive OEMs, Tier‑1 electronic subsystem suppliers, semiconductor and module vendors implementing CXPI controllers, independent test laboratories, and conformity/certification bodies. The standard is applied during design verification, pre‑qualification and formal conformance testing to ensure interoperable CXPI nodes in vehicle subnetworks.

Related standards

ISO 20794 is a multipart standard for CXPI. Relevant related parts include ISO 20794-2 (Application layer), ISO 20794-3 (Transport and network layer), ISO 20794-4 (Data link layer and physical layer specification), ISO 20794-5 (Application layer conformance test plan) and ISO 20794-6 (Transport and network layer conformance test plan). CXPI originated from earlier JASO and SAE work and was standardized internationally as ISO 20794 in 2020.

Keywords

CXPI, Clock Extension Peripheral Interface, ISO 20794-7, conformance test plan, data link layer, physical layer, automotive networking, CRC, arbitration, PHY tests.

FAQ

Q: What is this standard?

A: ISO 20794-7:2020 is the part of the ISO 20794 series that defines conformance test plans for the CXPI data link and physical layers—used to verify that implementations meet the CXPI protocol requirements.

Q: What does it cover?

A: It covers test case specifications, operational concepts for running conformance tests, and criteria for validating error-detection behavior and PHY/DLL conformity for CXPI nodes.

Q: Who typically uses it?

A: Automotive manufacturers, electronics suppliers, chip vendors, test laboratories and certification bodies use it to validate CXPI implementations for interoperability and compliance.

Q: Is it current or superseded?

A: Published in October 2020 (Edition 1) and listed by ISO as published and under periodic review. Users should check ISO or their national standards body for any confirmation, revision or withdrawal notices beyond the 2020 edition.

Q: Is it part of a series?

A: Yes — ISO 20794 is a multipart standard covering CXPI layers and conformance plans (notably parts -2, -3, -4, -5, -6 and -7). Part 7 is the conformance test plan for data link and physical layers.

Q: What are the key keywords?

A: CXPI, conformance test plan, data link layer, physical layer, ISO 20794, automotive network protocol, CRC, arbitration, PHY testing.