EC Ground14CEC15SCL16SDA17Reserved (N.C. on device)18+5V Power19Hot Plug Detect　英文定义： 　　􀂋Digital interface defined around DVI 1.0 that tranSMIts video and audio on the same physical channel. 　　􀂋Interface defined for use in the consumer market space. 　　􀁺Requires separate licensing from that of DDWG’s DVI. 　　􀁺Allows DVI/HDMI products to be sold in consumer products 　　􀂋Supports the use of HDCP copy protection. 　　􀂋Utilizes VESA’s Display Data Channel to read E-EDID from a display. 　　􀂋Defines a different connector from that used on DVI. 　　􀂋Supports optional CEC (Consumer Electronics Control), which allows high level control of all A/V products in a user environment. 　　DVI 1.0: The Physical Interface 　　􀂋Digital Visual Interface (DVI) was developed by a group called the Digital Display Working Group or DDWG for the PC market. 　　􀂋The interface is a high speed digital serial interface based on Transition Minimized Differential Signaling or TMDS. 　　􀁺Source synchronous architecture. Uses a separate channel to tranSMIt the clock. 　　􀁺Used to provide variable data rates to handle the various VESA supported display resolutions. 　　􀂋A complete connection from the source to the sink devices uses three data channels (RGB/YCbCr) and a clock. 　　HDMI = DVI + Audio 　　􀂋Using the DVI physical link to tranSMIt video/graphics 　　􀂋Audio is added as a logical layer to the DVI phy. 　　􀁺Digital audio processed into packets of data 　　􀁺These packets are scheduled for tranSMIssion during existing horizontal and vertical blanking times within a frame. 　　􀂋In addition, HDMI implements a packet called an infoFrame. 　　􀁺InfoFramesare structures defined in the EIA-861B specification 　　􀁺EIA-861B is spec for DTV and uncompressed high speed digital interfaces. 　　What is HDMI Data? 　　􀂋There are three categories of data that is tranSMItted via an HDMI link. 　　􀁺Video Data –Video pixel data (8b data encoded to 10b), and Guard Bands (fixed 10b pattern) 　　􀁺Data Island –Packet data, which can be either audio samples or Infoframes(TERC4 encoded, 4b encoded to 10b) as well as its own Guard Band (fixed 10b pattern). 　　􀁺Control –Control period coding, in which we find HSYNC, VSYNC (2b to 10b encoding) and a Preamble (used to determine whether subsequent data is video or data island)