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| Unified Display Interface |
| Type |
Digital video connector |
| Production history |
| Designer |
Unified Display Interface Work Group |
| Designed |
2006 |
| Specifications |
| Length |
18.8 mm |
| Width |
12.5 mm |
| Height |
3.7 mm |
| Hot pluggable |
Yes |
| External |
Yes |
|
Max voltage |
+5V |
|
Max current |
0.5 A |
| Audio signal |
No |
| Video signal |
Yes |
| Data signal |
R,G,B data + clock and display data channel (TDMS) |
|
Width |
36 bit (maximum) |
|
Bandwidth |
16 Gbit/s |
| Pins |
26 |
| Pin out |
| Pin 1 |
Supply voltage for data link circutry |
VDD_UDL |
| Pin 2 |
Supply voltage for data link circutry |
VDD_UDL |
| Pin 3 |
Supply voltage for data link circutry |
VDD_UDL |
| Pin 4 |
Supply voltage for data link circutry |
VDD_UDL |
| Pin 5 |
Supply return for control and data link power |
VSS |
| Pin 6 |
Supply return for control and data link power |
VSS |
| Pin 7 |
Supply return for control and data link power |
VSS |
| Pin 8 |
Supply return for control and data link power |
VSS |
| Pin 9 |
Positive side of UDI lane 0 data (userd for x1 and x3 lane widths) |
UDI_Data0+ |
| Pin 10 |
Negative side of UDI lane 0 data (userd for x1 and x3 lane widths) |
UDI_Data0- |
| Pin 11 |
Shield for UDI_Data0[-/-] |
GND |
| Pin 12 |
Positive side of UDI lane 1 data (userd for x1 and x3 lane widths) |
UDI_Data1+ |
| Pin 13 |
Negative side of UDI lane 1 data (userd for x1 and x3 lane widths) |
UDI_Data1- |
| Pin 14 |
Shield for UDI_Data1[-/-] |
Ground |
| Pin 15 |
Positive side of UDI lane 2 data (userd for x1 and x3 lane widths) |
UDI_Data2+ |
| Pin 16 |
Negative side of UDI lane 1 data (userd for x1 and x3 lane widths) |
UDI_Data2- |
| Pin 17 |
Shield for UDI_Data2[-/-] |
GND |
| Pin 18 |
Reserved connector pin. No cable connection |
(NC) |
| Pin 19 |
Reserved connector pin. No cable connection |
(NC) |
| Pin 20 |
Reserved connector pin. No cable connection |
(NC) |
| Pin 21 |
|
(Test Pin) |
| Pin 22 |
Ground return |
GND |
| Pin 23 |
Supply voltage for control link signals |
UDI_EPwr |
| Pin 24 |
UDI control link clock |
UDI_CtrlClk |
| Pin 25 |
UDI Control link data |
UDI_CtrlData |
| Pin 26 |
UDI link hot-plug detect |
UDI_HPD |
Unified Display Interface (UDI) is a digital video interface specification based on Digital Visual Interface. It is intended to be a lower-cost implementation while providing compatibility with existing High-Definition Multimedia Interface (HDMI) and DVI displays. Unlike HDMI, which is aimed at high-definition multimedia consumer electronics devices such as television monitors and DVD players, UDI is specifically targeted towards the needs of computer monitor and video card manufacturers. There has been little word on UDI since early 2007 and the UDI website is no longer operational.[1]
[edit] Overview
UDI provides higher bandwidth than its predecessors (up to 16 Gbit/s in its first version, compared to 4.9 Gbit/s for HDMI 1.0) and incorporates a form of Digital Rights Management known as High-bandwidth Digital Content Protection. The connector has a single row of 26 contacts pitched 0.6 mm apart from each other, looking very similar to the USB plug which has a single row with only four contacts. Three of the 26 contacts will not be wired but are reserved for undetermined future upgrade possibilities. Transmit and receive plugs are slightly different, and a UDI cable will fit only one way. Bidirectional communication works at a much lower data rate than that available for the single direction video datastream.
On December 20, 2005, the UDI Special Interest Group (UDI SIG) was announced. They worked on determining the refined specifications and promoting the interface. Members included Apple Computer, Intel, LG, NVIDIA, Samsung, and Silicon Image Inc.. The UDI specification was finalized in July 2006. The differences between UDI and HDMI was kept to a minimum since both specifications were designed for long-term compatibility. In early 2007 Samsung and Intel withdrew from the UDI SIG.
[edit] References
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Audio and Video Connectors |
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| Single conductor |
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| Analog audio |
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| Digital audio |
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| Video |
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| Multi |
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