ISO 20794:2020

Description

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.