Unified Display Interface description, UDI Pinout

Unified Display Interface [UDI]

UDI Description

The Unified Display Interface [UDI] was a standard for high-speed, high-resolution digital displays. It started as a replacement to the DVI connection on PCs and as a complement to HDMI connections for A/V interfaces. However after the release of the first few revisions [2005/2006] of the standard [before any products were developed] support for the standard was dropped [2007]. It would appear that support was transferred to the DisplayPort Interface.

This page is a copy of the DVI page and does not yet describe the UDI interface.

Below is a 24 Pin DVI Female connector seen at the Computer. The connector diagram and pin-out table show a DVI-I Digital and Analog [RGB]; 29 pins [modified D style] connector. A DVI-D Digital only connector with 24 pins [modified D style] looks about the same with out the 4 analog 'C' pins.

The DVI interface is found on a number of devices including TVs, Computers, Monitors, and Video cards.
Digital Visual Interface was developed by the Digital Display Working Group (DDWG).

Digital Video Broadcasting/Digital Audio-Visual Council (DVB/DAVIC), developed by DAVIC and DVB and adopted by European Telecommunication Standards Institute (ETSI) and International Telecommunication Union (ITU)

DVI has a number of different types connectors:
DVI-D Digital only connector; 24 pins [modified D style];
DVI-A Analog only; [modified D style], I don't think this is part of the standard
DVI-I Digital and Analog [RGB]; 29 pins [modified D style]
DFP Digital Flat Panel, Digital only connector. Pinout is listed on the DFP page

DVI Connector

UDI Connector Manufacturers

This standard has no industry supports, there are no released products.

DVI Pinout Table

**29 pin DVI Connector PinOut and Signal Names**
Pin #	Signal Name	Pin #	Signal Name	Pin #	Signal Name
1	TMDS Data2-	9	TMDS Data1-	17	TMDS Data0-
2	TMDS Data2+	10	TMDS Data1+	18	TMDSData0+
3	TMDS Data2/4 Shield	11	TMDS Data1/3 Shield	19	TMDS Data0/5 Shield
4	TMDS Data4-	12	TMDS Data3-	20	TMDS Data5-
5	TMDS Data4+	13	TMDS Data3+	21	TMDS Data5+
6	DDC Clock [SCL]	14	+5 V Power	22	TMDS Clock Shield
7	DDC Data [SDA]	15	Ground (for +5 V)	23	TMDS Clock +
8	Analog vertical sync	16	Hot Plug Detect	24	TMDS Clock -
C1	Analog Red	--	--	--	--
C2	Analog Green	--	--	--	--
C3	Analog Blue	--	--	--	--
C4	Analog Horizontal Sync	--	--	--	--
C5	Analog GND Return: (analog R, G, B)	--	--	--	--

The pinout table above provides the pin out for a DVI-I connector, supporting both digital and analog signals. Single Link DVI uses 12 of the available pins providing a maximum bandwidth of 165MHz. Single Link connectors do not use pins 4, 5, 12, 13, 20 and 21. Dual link DVI is implemented when all 24 pins are used providing 2 x 165MHz bandwidth. The analog signal are implemented by the 'micro-cross' pins; C1 - C5.
The DDC interface pins use the I2C interface bus, as DDC Data for SDA, and DDC Clock as SCL.
TMDS; Transition Minimized Differential Signaling
The DVI-I connector may be used with a VGA connector by way of an adapter, while the DVI-D [Digital only] is not compatible.

An Apple computer may have either a DVI connector as described above or a Apple display connector [ADC] which is an Apple proprietary interface connector.

Back to the main Video Buses page, or the main Personal Computer Interface Bus page

Electronic Design Key words: Video Cable Bus, UDI, HDMI, DVI, Digital Visual Interface, DVI Video, Monitor, Electrical Standard, Interface Standard, Specification, Spec, Electrical Interface, Digital Display, Semiconductor IC manufacturers, Physical Interface, Engineering Description, electrical characteristics, Component Manufacturers, Signal Assignment, Plug, Receptacle, DVI Pin Out, PinOut, Signal Names


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