### BCM5228 10/100BASE-TX/FX Octal-Φ™ Transceiver：深度解析 #### 核心知识点概览 **BCM5228**是博通公司（Broadcom）推出的一款高度集成化的八端口（Octal）10/100BASE-TX/FX快速以太网收发器芯片，专为快速以太网交换机设计。该芯片融合了数字自适应均衡器、模数转换器（ADC）、相位锁定环（PLL）、线路驱动器、编码器、解码器以及必要的支持电路于单个CMOS芯片中，提供了物理层接口的所有功能，满足IEEE 802.3标准的要求，包括自动协商子部分。 #### 技术细节与特性 - **物理层接口**：BCM5228包含八个全双工的10BASE-T/100BASE-TX/FX快速以太网收发器，每个收发器都能处理所有10BASE-T以太网在3类、4类或5类非屏蔽双绞线（UTP）电缆上的物理层接口功能，以及100BASE-TX快速以太网上5类UTP电缆的物理层接口功能。通过外部光纤发射和接收设备的支持，每个端口还能够实现100BASE-FX。 - **高度集成化**：该芯片通过集成数字自适应均衡器、模数转换器、相位锁定环、线路驱动器等组件，实现了高度的集成化，大大减少了外部元件的需求，简化了设计并降低了成本。 - **数字技术应用**：BCM5228利用先进的数字技术，如数字自适应均衡和数字时钟恢复技术，消除了混合信号实施中常见的问题，如模拟偏移和芯片内噪声，从而在广泛的操作场景中展现出强大的性能。 - **标准与协议**：该芯片完全符合IEEE 802.3u规范，支持单芯片八端口物理接口（RMIItomagnetics），同时提供Reduced Media Independent Interface (RMII)，Option Serial Media Independent Interface (SMII)，以及Option Source Synchronous SMII (S3MII)等不同接口选项。 - **其他特性**： - 内置125MHz时钟发生器和定时恢复功能； - 芯片上多模传输波形整形； - 边缘速率控制，无需外部滤波器； - 集成基线游移校正； - 支持HP Auto-MDIX（自动交叉检测）； - 提供电缆长度指示和电缆噪声水平指示； - 符合IEEE 802.3u规范的自动协商功能； - 共享MIImanagement interface最高可达25Mbps； - 串行LED状态引脚和可编程并行LED引脚； - 支持中断输出功能； - 诊断用的环回模式； - IEEE1149.1 (JTAG) 和 NAND链ICT支持； - 低功耗双电源2.5V/3.3V CMOS技术。 #### 结论 BCM5228是一款功能全面且高度集成的快速以太网收发器芯片，其在设计上充分考虑了性能、功耗和成本的平衡，适用于各种高速数据传输应用场景。通过采用数字技术和高度集成化的设计理念，BCM5228不仅简化了系统设计，还显著提高了数据传输的稳定性和可靠性，是现代网络基础设施建设中的关键组件之一。

Media Gateway 用于监控车载以太网通信，以太网端口测试，CAN/LIN/Flexray与100Base-T1路由测试等；在BMW，AUDI，BOSCH以及国内多公司大量使用； MediaGateway from Technica Engineering is a development tool for testing and analyzing on-board vehicle networks. MediaGateway from Technica Engineering is the most widely used development and testing tool for on-board vehicle networks using 100BASE-T1. It’s in-built automotive switches and 12 x 100BASE-T1 ports enable both capture of traffic between devices while maintaining the normal communication, as well as interaction with such devices via your test set-up. It supports single and double tagging of VLANs, Mirroring, Forwarding and more. MediaGateway is excellently suitable for subsystem testing stations and can also be installed in a test vehicle without complications. It is configured conveniently via a browser through the integrated web server. An additional and optional CAN-Ethernet bi-directional conversion is available, as well as FlexRay logging via Ethernet and one SFP slot. The SFP slot supports commercial-grade SFP modules (e.g. optical or RJ-45) as well as our 100BASE-T1 SFP Module in order to get a 13th Automotive Ethernet Port or our 1000BASE-T1 SFP Module – this makes the MediaGateway ready for Automotive Gigabit Ethernet! 12 Broadcom 100BASE-T1 ports (100 MBit/s full duplex on a single unshielded twisted pair) 3 Gigabit Ethernet ports 1 SFP Gigabit Ethernet port Automotive Tyco MQS connectors for 100BASE-T1 and power supply Web server for easy configuration: Master/Slave, HalfOut/FullOut, Port Forwarding, Port Mirroring, VLAN Tagging WakeUp function by CAN Bus or Wakeline Power output for attached devices: VBAT max. 1 Ampere in total 19 status LEDs Possibility to reset to default settings by pushbutton Robust steel case Power requirement: 8 to 16 V DC, power consumption: 8 Watt Size: 195 x 143 x 33 mm 802.1AS Bridge function

汽车以太网联盟OPEN的 TC1 100BASE-T1 PMA Spec.

Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method and physical layer specifications

The TJA1101B is a 100BASE-T1-compliant Ethernet PHY optimized for automotive use cases such as gateways, IP camera links, radar modules, driver assistance systems and back-bone networks. The device provides 100 Mbit/s transmit and receive capability over a single unshielded twisted-pair cable, supporting a cable length of up to at least 15 m. The TJA1101B has been designed for automotive robustness and ISO 26262, ASIL-A compliance, while minimizing power consumption and system costs.

This reference document describes the configuration, register structure and mapping of the TJA1101A Ethernet PHY.

车载以太网白皮书：汽车网络的演变

这个网上很难下，找了很久，拿出来分享一下

100BASE-T 建链分析. 标准上定义的Local receiver status对建链的影响. 对于Master/Slave Resolve标准定义

BCM5338MIQMG是BROADCOM公司的一款百兆9端口以太网交换芯片：8个10BASE-T和100BASE-TX9以太网收发器；9个MAC；符合IEEE802.3、802.3uHE 802.3x规范；256KB内存空间用于数据包缓存和控制；10Base-T支持UTP(Unshield Twisted pair) Cat3/4/5电缆，100BASE-TX支持CAT5电缆。热阻抗：17℃/W。供电：1.8V、3.3V。尺寸：30.85mm*30.85mm*4mm。