ISO 20794-4
Road vehicles — Clock extension peripheral interface (CXPI) — Part 4: Data link layer and physical layer
| Organization: | ISO |
| Publication Date: | 1 February 2020 |
| Status: | active |
| Page Count: | 66 |
| ICS Code (Car informatics. On board computer systems): | 43.040.15 |
scope:
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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