媒體獨立介面(MII)在印刷電路板佈線的性能穩定度驗證

A Verification of the Performance Stability for MII Layout in PCB

陳安邦(Arn-Bun Chen) ； 陳慧敏(Hui-Min Chen) ； 彭志翔(Chih-Hsiang Peng)

《中華技術學院學報》 38期 (2008/06) Pp. 105-112

https://doi.org/10.7095/JCIT.200806.0105

摘要

一般我們常用的網際網路功能技術，我們都稱之為乙太網路(Ethernet)，這種技術是基於IEEE所制定的IEEE802.3標準，這個標準有制定了物理層的連接訊號及電氣特性規範等方面。其中媒體獨立介面(MII)介面常用來做資料連結層(MAC)跟實體層(PHY)的連接介面，MAC可以透過MII去對PHY作控制。目前由於Ethernet的快速發展，所以MII介面所衍生出來的有簡化媒體獨立介面(RMII)、千兆媒體獨立介面(GMII)、簡化千兆媒體獨立介面(RGMII)和串列媒體獨立介面(SMII)等各種不同的介面。這些都是為了因應Ethernet的速度提升及產品的體積減小，而發展出來的介面。其實他們的主要功能都是為了跟PHY作連結。由於這些介面都是利用銅箔在PCB上面做佈線，所以都需要驗證PCB上的佈線不會受外界干擾。本文是介紹如何驗證MII的電氣訊號的正確性及可行性。

關鍵字

乙太網路 ； MII ； 網路功能 ； IEEE802.3

並列摘要

In general, the internet technology of which we operate is very often, all of us call it as ”Ethernet”. This technology is based on IEEE 802.3 standard and to be specified by IEEE group. In this standard, it has been made such as the connection signal of physics layer and electric characteristic. We often use the MII (Media Independent Interface) to connect with MAC layer and PHY layer. Then, MAC layer can control PHY layer through MII. Because the development of Ethernet is very fast recently, the ones that extended out from MII interfaces are such as RMII, GMII, RGMII and SMII, etc. Because the improvement of speed for Ethernet and the volume of the products are reduced, extend out of these interfaces. In fact their main function is to let MAC do the link with PHY. Because these interfaces are utilized copper screen to be made and connected up on PCB, we will try all possible means to prove the copper wire on PCB and it will not be interfered by the external signal. This paper shows us how to prove the electric signal of MII is exactness and feasibility.

並列關鍵字

Ethernet ； MII ； Network Function ； IEEE802.3