ISO 20794-4:2020

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

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ISO 20794-4:2020

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

PUBLISH DATE 2020
ISO 20794-4:2020

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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