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I have seen the abbreviation phy beeing used for a handful of different things within the context of ethernet phy并不是单独的词根词缀,题主感觉他很常见可能是因为如下几个词素比较常见。 「physic-」,13世纪表示的意思是“药剂”,到14世纪早期的时候有了“自然科学”的意思,14世纪晚期也可以指“the art of healing, medical science or theory”;physical,physics就是基于这个. A phy is a type of ethernet physical layer (eg
PHY芯片 PHY芯片实现数据传送与接收所需要的电与光信号、线路状态、时钟基准、数据编码和电路等,并向数据链路层设备提供标准接口。 “PHY”从字面理解就是“Physical”的简称。如果是一个PHY器件,我们叫PHY设备。它在OSI模型中的最底层即物理层(Physical Layer)。 物理层的主要功能是:利用传输介质为数据链路层提供物理连接,实现比特流的透明传输。 物理层的作用是实现相邻计算机节点之间比特流的透明传送,尽可能屏蔽掉具体. PHY地址是在软件适配时必须要知道的,如何看手册、看电路图也是工作中一项基本的技能。 你的问题可以按如下步骤去解,且不仅限于88E1111,适用所有的PHY芯片,本人的回答重在保姆级手把手地教你方法,仔细往下看:
由于电流型PHY需要外接电源提供电流,在配套两线共模电感使用时,输出低电平时,电流经过主变压器以及共模电感上半线圈形成回路,输出高电平时反之,输出0时则经过共模电感两个线圈形成回路,当电流只流经一个线圈时,产生的磁场无法抵消,共模电感.
而MAC是典型的全数字器件。 从电路连接关系看, PHY的下行接口为差分线(接RJ45水晶头),接收和发送的是模拟信号,上行口是MII,接收和发送的是数字信号。 MAC的上行口是PCI总线或SOC内部总线,下行是MII接口连接的是PHY的上行口。 认识以太网PHY 本人之前已回答过几个PHY相关的提问,不算非常系统,但对刚接触这块的也算是不错的入门参考了。 下面这个回答讲解了什么是PHY,其在OSI 七层模型 的位置,并以博通BCM8705 PHY芯片框图为例,讲解了一个以太网PHY的基本组成: DDRPHY(Double Data Rate PHY)是用于控制和管理DDR(Double Data Rate)存储器接口的物理层接口。 连接DDR颗粒和DDR Controller的桥梁,它负责把DDR Controller发过来的数据转换成符合DDR协议的信号,并发送到DDR颗粒;相反地,其也负责把DRAM发送过来的数据转换成符合DFI协议的. 以太网物理 (PHY)层是IEEE 802.3的其中一个元素,它是一种收发器组件,用于发送和接收数据或以太网帧,负责对纯数字系统和信号传输介质之间传输的数据进行编码和解码。因此,它代表着接口的数字连接层和电子连接层之间的桥梁。PHY可以是分立元件,也可以集成到以太网控制器中,图1的简化框图.
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