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ISO 20794-4:2020

Current Revision

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

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 20794
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 22/SC 31
Publish Date Document Id Type View
Not Available ISO 20794-4:2020 Revision