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你所不了解HDMI接口是怎么设计的

date:On October 26, 2017 Source:  

   HDMI光纤的话题我们已经探究了很多,可是很少在HDMI接口里探究过,看是简单的设计,但是里面的功能可是非常强大。不能说好形容它的魅力,今天就由利诺威的HDMI光纤的为你解说HDMI接口的设计原理。

HDHI fiber topic we have explored a lot, but rarely explored in the HDMI interface, to see is a simple design, but the inside of the function, but very powerful. Can not say good to describe its charm, today by Lenuo's HDMI optical fiber for you to explain the design principles of HDMI interface.


   HDMI的全称是“HighDefinitionMultimedia”,即:高清多媒体接口。HDMI在引脚上和DVI兼容,只是采用了不同的封装。与DVI相比。HDMI可以传输数字音频信号,并增加了对HDCP的支持,同时提供了更好的DDC可选功能。

HDMI full name is "HighDefinitionMultimedia", namely: high-definition multimedia interface. HDMI is pin compatible with DVI, just uses a different package. Compared with DVI. HDMI can transmit digital audio signals and add support for HDCP, while providing better DDC optional features.


HDMI光纤

   HDMI最远可传输15米,足以应付一个1080p的视频和一个8声道的音频信号。HDMI支持EDID、DDC2B,因此HDMI的设备具有“即插即用”的特点,信号源和显示设备之间会自动进行“协商”,自动选择最合适的视频倍频格式。一对时钟差分,三对数据传输差分。2、走线设计要求尽可能使HDMI连接器和器件之间的电气长度保持最短,从而使衰减最小化。为了使差分信号正常传输,一个差分对的两走线间距必须在整个走线轨迹上上保持一致。

HDMI farthest up to 15 meters, enough to cope with a 1080p video and an 8-channel audio signal. HDM1 support EDID, DDC2B, so the HDMI device has a "plug and play" feature, the signal source and display devices will automatically "negotiation", automatically select the most appropriate video frequency format. A pair of clock differential, three pairs of data transmission differential. 2, the alignment design requires that the electrical length between the HDMI connector and the device be kept as short as possible, minimizing attenuation. In order for the differential signal to be transmitted normally, the two-track spacing of a differential pair must be consistent across the entire trajectory.


   从而降低磁场消除的效果,造成EMI增加。推荐线宽间距比为1:1<><>因为不同电气长度的走线会引起信号之间的相移,也会导致严重EMI,理想情况下,四对差分走线走线长度应该相等,保证信号传输的时序匹配。下图显示了相等及不同长度走线的逻辑状态。四队差分走线对内误差最好做到5mil范围之内,对与对的差分误差最好控制在10mil范围之内。

Thereby reducing the effect of magnetic field elimination, resulting in EMI increase. The recommended line width spacing ratio is 1: 1 <> <> Since the traces of different electrical lengths cause the phase shift between the signals and can cause severe EMI. Ideally, the four pairs of differential traces should be equal in length, To ensure the timing of signal transmission match. The following figure shows the logical states of equal and different length traces. Four teams of differential alignment within the best error within 5mil within the range of the difference between the best error control in the 10mil range.


   想了解更多相关信息请登陆利诺威网站:http://www.hdmiaoc.com/

For more information, please visit the Lenewei website: http://www.hdmiaoc.com/

   联系电话:+86755-23224889

Tel: + 86755-23224889

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Address: Bao'an District, Shenzhen City, Guangdong Province, Shajing Town Center Road Jincheng Building 7H

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