ISO 20794-4:2020
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English
02-05-2020
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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