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ISO 20794-4:2020

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

General information
Valid from 05.02.2020
Directives or regulations
None
Standard history
Status
Date
Type
Name
05.02.2020
Main
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.
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