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Homepage>BS Standards>43 ROAD VEHICLE ENGINEERING>43.040 Road vehicle systems>43.040.15 Car informatics. On board computer systems>BS ISO 20794-4:2020 Road vehicles. Clock extension peripheral interface (CXPI) Data link layer and physical layer
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BS ISO 20794-4:2020 Road vehicles. Clock extension peripheral interface (CXPI) Data link layer and physical layer

BS ISO 20794-4:2020

Road vehicles. Clock extension peripheral interface (CXPI) Data link layer and physical layer

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Standard number:BS ISO 20794-4:2020
Pages:70
Released:2020-02-13
ISBN:978 0 580 97226 3
Status:Standard
DESCRIPTION

BS ISO 20794-4:2020


This standard BS ISO 20794-4:2020 Road vehicles. Clock extension peripheral interface (CXPI) is classified in these ICS categories:
  • 43.040.15 Car informatics. On board computer systems

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.