IEEE802.3bw-100BASE-T1：车载以太网物理层技术规范
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收藏 3.06MB PDF 举报 "IEEE802.3bw-100BASE-T1-2015标准，也称为roadR-Reach（BRR）或OABR（Open Alliance BroadR-Reach）技术，是专为车载以太网设计的物理层（PHY）规范。该标准由IEEE LAN/MAN Standards Committee制定，旨在提供在单对平衡双绞线电缆上运行的100Mbps传输速率。"
IEEE 802.3bw-2015是IEEE 802.3标准的一个修正案，它的主要目标是满足汽车工业对高速、低延迟通信的需求。在汽车领域，传统的以太网技术往往无法满足高性能和低功耗的要求，而100BASE-T1则为此提供了解决方案。100BASE-T1的名称来源于其最大数据传输速度——100兆比特每秒（Mbps），以及使用了一对平衡双绞线（与传统的4线以太网不同）。
BroadR-Reach（BRR）和OABR（Open Alliance BroadR-Reach）是同一种技术的不同命名，由Open Alliance Special Interest Group推广，这个组织专注于推动车载以太网技术的发展。BRR技术的独特之处在于它能够在单对非屏蔽双绞线（UTP）上实现全双工通信，这意味着在同一根线上可以同时发送和接收数据，且具有良好的电磁兼容性（EMC）和抗干扰能力。
此标准的实施允许汽车制造商在车辆内部构建一个高效、灵活的网络，支持高级驾驶辅助系统（ADAS）、多媒体娱乐系统、远程信息处理和无线更新等功能。与传统以太网相比，100BASE-T1减少了线束的复杂性和重量，从而降低了成本并提高了能效。
IEEE 802.3bw-2015标准包含了物理层的详细规格，包括信号编码、电气接口、连接器类型以及在恶劣环境条件下的性能要求。它还定义了管理参数，用于监控网络性能和确保系统的稳定运行。通过这个标准，汽车制造商能够构建一个可靠、经济且适应未来技术发展的车内通信网络。
100BASE-T1（IEEE 802.3bw-2015）作为车载以太网的关键技术，极大地推动了汽车行业向智能化、网络化方向发展，提供了更高带宽、更低延迟的网络基础设施，为实现更安全、更智能的汽车奠定了基础。
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Copyright © 2015 IEEE. All rights reserved.
96.3.3.2.2Functions........................................................................................ 43
96.3.3.2.3Timers ............................................................................................ 43
96.3.3.2.4Messages........................................................................................ 45
96.3.3.3 PCS transmit symbol generation.................................................................... 45
96.3.3.3.1Side-stream scrambler polynomial ................................................ 45
96.3.3.3.2Generation of Syn[2:0] .................................................................. 45
96.3.3.3.3Generation of Scn[2:0]................................................................... 46
96.3.3.3.4Generation of scrambled bits Sdn[2:0] .......................................... 46
96.3.3.3.5Generation of ternary pair (TAn, TBn).......................................... 46
96.3.3.3.6Generation of (TAn, TBn) when tx_mode = SEND_I................... 46
96.3.3.3.7Generation of (TAn, TBn) when tx_mode = SEND_N,
tx_enable = 1.................................................................................................. 46
96.3.3.3.8Generation of (TAn, TBn) for idle sequence when ..........................
tx_mode=SEND_N........................................................................................ 46
96.3.3.3.9Generation of (TAn, TBn) when tx_mode=SEND_Z ................... 47
96.3.3.3.10Generation of symbol sequence................................................... 48
96.3.4 PCS Receive .................................................................................................................. 48
96.3.4.1 PCS Receive overview................................................................................... 48
96.3.4.1.1Variables ........................................................................................ 51
96.3.4.1.2Functions........................................................................................ 52
96.3.4.1.3Timer.............................................................................................. 52
96.3.4.2 PCS Receive symbol decoding ...................................................................... 53
96.3.4.3 PCS Receive descrambler polynomial........................................................... 53
96.3.4.4 PCS Receive automatic polarity detection (Optional) ................................... 53
96.3.4.5 PCS Receive MII signal 3B/4B conversion................................................... 54
96.3.5 PCS Loopback ............................................................................................................... 54
96.4 Physical Medium Attachment (PMA) Sublayer ........................................................................ 55
96.4.1 PMA Reset function....................................................................................................... 55
96.4.2 PMA Transmit function................................................................................................. 56
96.4.3 PMA Receive function................................................................................................... 57
96.4.4 PHY Control function.................................................................................................... 58
96.4.5 Link Monitor function ................................................................................................... 58
96.4.6 PMA clock recovery ...................................................................................................... 58
96.4.7 State variables................................................................................................................ 58
96.4.7.1 State diagram variables.................................................................................. 58
96.4.7.2 Timers ............................................................................................................ 61
96.5 PMA electrical specifications .................................................................................................... 61
96.5.1 EMC tests....................................................................................................................... 61
96.5.1.1 Immunity—DPI test....................................................................................... 61
96.5.1.2 Emission—Conducted emission test ............................................................. 62
96.5.2 Test modes ..................................................................................................................... 62
96.5.3 Test fixtures ................................................................................................................... 63
96.5.4 Transmitter electrical specifications .............................................................................. 64
96.5.4.1 Transmitter output droop ............................................................................... 65
96.5.4.2 Transmitter distortion .................................................................................... 65
96.5.4.3 Transmitter timing jitter................................................................................. 67
96.5.4.4 Transmitter power spectral density (PSD)..................................................... 67
96.5.4.5 Transmit clock frequency .............................................................................. 68
96.5.5 Receiver electrical specifications................................................................................... 69
96.5.5.1 Receiver differential input signals ................................................................. 69
96.5.5.2 Receiver frequency tolerance......................................................................... 69
96.5.5.3 Alien crosstalk noise rejection ....................................................................... 69
96.5.6 Transmitter peak differential output .............................................................................. 69
96.5.7 PMA Local Loopback.................................................................................................... 70
Authorized licensed use limited to: zhang haifeng. Downloaded on January 16,2018 at 07:27:11 UTC from IEEE Xplore. Restrictions apply.
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