ISO 20794-4:2020 PDF

Scope: This document specifies the CXPI data link layer and the CXPI physical layer. The DLL is based on: — priority-based CXPI network access; — non-destructive content-based arbitration; — broadcast frame transfer and acceptance filtering; and — node related error detection and error signalling. The CXPI physical layer (PHY) requirements comprise of: — physical signalling (PS) sub-layer, which specifies the requirements of the clock generation function, the encoding and decoding of CXPI frames, and bit-wise collision resolution logic; — physical media attachment (PMA) sub-layer, which specifies the requirements of the signal shaping waveform logic; — physical media dependent (PMD) sub-layer, which specifies the requirements of the CXPI network termination, electrostatic discharge protection, etc., and device connector requirements; and — physical media (PM), which specifies the requirements of the CXPI network cable/wiring harness.

ISO 20794-4:2020 Referenced Document

ISO 20794-2 Road vehicles — Clock extension peripheral interface (CXPI) — Part 2: Application layer
ISO 20794-3 Road vehicles — Clock extension peripheral interface (CXPI) — Part 3: Transport and network layer
ISO/IEC 7498-1 Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model

2020 ISO 20794-4:2020 Road vehicles — Clock extension peripheral interface (CXPI) — Part 4: Data link layer and physical layer