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 Amale DVI-D (single link) connector | |||
| Type | Digital computer video connector | ||
|---|---|---|---|
| Production history | |||
| Designer | Digital Display Working Group | ||
| Designed | April 1999; 25 years ago (1999-04) | ||
| Produced | 1999–present | ||
| Superseded | VGA connector | ||
| Superseded by | DisplayPort,HDMI | ||
| General specifications | |||
| Hot pluggable | Yes | ||
| External | Yes | ||
| Video signal | Digital video stream: Single link:1920 × 1200 (WUXGA) @ 60 Hz or2560 × 1600 (WQXGA) @ 30 Hz Dual link:2560 × 1600 (WQXGA) @ 60 Hz or3840 × 2400 (WQUXGA) @ 30 Hz Analog video stream:1920 × 1200 (WUXGA) @ 60 Hz | ||
| Pins | DVI-D Single Link: 19 DVI-D Dual Link: 25 DVI-I Single Link: 23 DVI-I Dual Link: 29 DVI-A: 11 DVI-M1-DA: 35 | ||
| Data | |||
| Bitrate | (Single link) 3.96 Gbit/s (Dual link) 7.92 Gbit/s | ||
| Max. devices | 1 | ||
| Protocol | 3 ×transition minimized differential signaling data and clock | ||
| Pinout | |||
 | |||
| A female DVI-I socket from the front | |||
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| Color coded (click to read text) | |||
| Pin 1 | TMDS data 2− | Digital red− (link 1) | |
| Pin 2 | TMDS data 2+ | Digital red+ (link 1) | |
| Pin 3 | TMDS data 2/4 shield | ||
| Pin 4 | TMDS data 4− | Digital green− (link 2) | |
| Pin 5 | TMDS data 4+ | Digital green+ (link 2) | |
| Pin 6 | DDC clock | ||
| Pin 7 | DDC data | ||
| Pin 8 | Analog vertical sync | ||
| Pin 9 | TMDS data 1− | Digital green− (link 1) | |
| Pin 10 | TMDS data 1+ | Digital green+ (link 1) | |
| Pin 11 | TMDS data 1/3 shield | ||
| Pin 12 | TMDS data 3− | Digital blue− (link 2) | |
| Pin 13 | TMDS data 3+ | Digital blue+ (link 2) | |
| Pin 14 | +5 V | Power for monitor when in standby | |
| Pin 15 | Ground | Return for pin 14 and analog sync | |
| Pin 16 | Hot plug detect | ||
| Pin 17 | TMDS data 0− | Digital blue− (link 1) and digital sync | |
| Pin 18 | TMDS data 0+ | Digital blue+ (link 1) and digital sync | |
| Pin 19 | TMDS data 0/5 shield | ||
| Pin 20 | TMDS data 5− | Digital red− (link 2) | |
| Pin 21 | TMDS data 5+ | Digital red+ (link 2) | |
| Pin 22 | TMDS clock shield | ||
| Pin 23 | TMDS clock+ | Digital clock+ (links 1 and 2) | |
| Pin 24 | TMDS clock− | Digital clock− (links 1 and 2) | |
| C1 | Analog red | ||
| C2 | Analog green | ||
| C3 | Analog blue | ||
| C4 | Analog horizontal sync | ||
| C5 | Analog ground | Return for R, G, and B signals | |
Digital Visual Interface (DVI) is avideo display interface developed by theDigital Display Working Group (DDWG). Thedigital interface is used to connect a video source, such as avideo display controller, to adisplay device, such as acomputer monitor. It was developed with the intention of creating an industry standard for the transfer ofuncompressed digital video content.
DVI devices manufactured as DVI-I have support for analog connections, and are compatible with the analogVGA interface[1] by including VGA pins, while DVI-D devices are digital-only. This compatibility, along with other advantages, led to its widespread acceptance over competing digital display standardsPlug and Display (P&D) andDigital Flat Panel (DFP).[2] Although DVI is predominantly associated with computers, it is sometimes used in other consumer electronics such astelevision sets andDVD players.
An earlier attempt to promulgate an updated standard to the analogVGA connector was made by theVideo Electronics Standards Association (VESA) in 1994 and 1995, with theEnhanced Video Connector (EVC), which was intended to consolidate cables between the computer and monitor.[3][4] EVC used a 35-pinMolex MicroCross connector and carried analog video (input and output), analog stereo audio (input and output), and data (viaUSB andFireWire). At the same time, with the increasing availability of digital flat-panel displays, the priority shifted to digital video transmission, which would remove the extra analog/digital conversion steps required for VGA and EVC;[5]: 5–6 the EVC connector was reused by VESA,[6] which released the Plug & Display (P&D) standard in 1997.[3] P&D offered single-linkTMDS digital video with, as an option, analog video output and data (USB and FireWire), using a 35-pin MicroCross connector similar to EVC; the analog audio and video input lines from EVC were repurposed to carry digital video for P&D.[5]: 4 [7]: §1.3.3
Because P&D was a physically large, expensive connector, a consortium of companies developed the DFP standard (1999), which was focused solely on digital video transmission using a 20-pinmicro ribbon connector and omitted the analog video and data capabilities of P&D.[4]: 3 [5]: 4 DVI instead chose to strip just the data functions from P&D, using a 29-pin MicroCross connector to carry digital and analog video.[8] Critically, DVI allows dual-link TMDS signals,[9] meaning it supports higher resolutions than the single-link P&D and DFP connectors, which led to its successful adoption as an industry standard. Compatibility of DVI with P&D and DFP is accomplished typically through passive adapters that provide appropriate physical interfaces, as all three standards use the same DDC/EDID handshaking protocols and TMDS digital video signals.[10]: §1.3.7
DVI made its way into products starting in 1999. One of the first DVI monitors wasApple's originalCinema Display, which launched in 1999.
DVI's digital video transmission format is based onpanelLink, a serial format developed bySilicon Image that utilizes a high-speed serial link calledtransition minimized differential signaling (TMDS).
Digital videopixel data is transported using multiple TMDStwisted pairs. At the electrical level, these pairs are highly resistant toelectrical noise and other forms of analogdistortion.
Asingle link DVI connection has four TMDS pairs. Three data pairs carry their designated 8-bit RGB component (red, green, or blue) of the video signal for a total of 24 bits perpixel. The fourth pair carries the TMDS clock. The binary data is encoded using8b/10b encoding. DVI does not usepacketization, but rather transmits the pixel data as if it were arasterized analog video signal. As such, the complete frame isdrawn during each vertical refresh period. The full active area of each frame is always transmitted without compression. Video modes typically use horizontal and vertical refresh timings that are compatible withcathode-ray tube (CRT) displays, though this is not a requirement. In single link mode, the maximum TMDS clock frequency is 165 MHz, which supports a maximum resolution of 2.75 megapixels (includingblanking interval) at 60 Hz refresh. For practical purposes, this allows a maximum 16:10 screen resolution of 1920 × 1200 at 60 Hz.
To support higher-resolution display devices, the DVI specification contains a provision fordual link. Dual link DVI doubles the number of TMDS data pairs, effectively doubling the video bandwidth, which allows higher resolutions up to 2560 × 1600 at 60 Hz or higher refresh rates for lower resolutions.
Forbackward compatibility with displays using analog VGA signals, some of the contacts in the DVI connector carry the analog VGA signals.
To ensure a basic level of interoperability, DVI compliant devices are required to support one baselinedisplay mode, "low pixel format" (640 × 480 at 60 Hz).
Like modern analogVGA connectors, the DVI connector includes pins for thedisplay data channel (DDC), which allows the graphics adapter to read the monitor'sextended display identification data (EDID). When a source and display using the DDC2 revision are connected, the source first queries the display's capabilities by reading the monitor EDID block over anI²C link. The EDID block contains the display's identification, color characteristics (such as gamma value), and table of supported video modes. The table can designate a preferred mode ornative resolution. Each mode is a set of timing values that define the duration and frequency of the horizontal/vertical sync, the positioning of the active display area, the horizontal resolution, vertical resolution, and refresh rate.
The maximum length recommended for DVI cables is not included in the specification, since it is dependent on the TMDS clock frequency. In general, cable lengths up to 4.5 metres (15 ft) will work for display resolutions up to 1920 × 1200. Longer cables up to 15 metres (49 ft) in length can be used with display resolutions 1280 × 1024 or lower. For greater distances, the use of a DVI booster—a signal repeater which may use an external power supply—is recommended to help mitigate signal degradation.
The DVI connector on a device is given one of three names, depending on which signals it implements:
Most DVI connector types—the exception is DVI-A—have pins that pass digital video signals. These come in two varieties: single link and dual link. Single link DVI employs a single transmitter with a TMDS clock up to 165 MHz that supports resolutions up to 1920 × 1200 at 60 Hz. Dual link DVI adds six pins, at the center of the connector, for a second transmitter increasing the bandwidth and supporting resolutions up to 2560 × 1600 at 60 Hz.[11] A connector with these additional pins is sometimes referred to as DVI-DL (dual link). Dual link should not be confused withdual display (also known asdual head), which is a configuration consisting of a single computer connected to two monitors, sometimes using aDMS-59 connector for two single link DVI connections.
In addition to digital, some DVI connectors also have pins that pass an analog signal, which can be used to connect an analog monitor. The analog pins are the four that surround the flat blade on a DVI-I or DVI-A connector. AVGA monitor, for example, can be connected to a video source with DVI-I through the use of a passive adapter. Since the analog pins are directly compatible with VGA signaling, passive adapters are simple and cheap to produce, providing a cost-effective solution to support VGA on DVI. The long flat pin on a DVI-I connector is wider than the same pin on a DVI-D connector, so even if the four analog pins were manually removed, it still wouldn't be possible to connect a male DVI-I to a female DVI-D. It is possible, however, to join a male DVI-D connector with a female DVI-I connector.[12]
DVI is the only widespread video standard that includes analog and digital transmission in the same connector.[13] Competing standards are exclusively digital: these include a system using low-voltage differential signaling (LVDS), known by its proprietary namesFPD-Link (flat-panel display) and FLATLINK; and its successors, theLVDS Display Interface (LDI) andOpenLDI.
SomeDVD players,HDTV sets, andvideo projectors have DVI connectors that transmit an encrypted signal for copy protection using theHigh-bandwidth Digital Content Protection (HDCP) protocol. Computers can be connected to HDTV sets over DVI, but the graphics card must support HDCP to play content protected bydigital rights management (DRM).
Generalized Timing Formula (GTF) is aVESA standard which can easily be calculated with theLinux gtf utility.Coordinated Video Timings-Reduced Blanking (CVT-RB) is aVESA standard which offers reduced horizontal and vertical blanking for non-CRT based displays.[15]
One of the purposes of DVI stream encoding is to provide aDC-balanced output that reduces decoding errors. This goal is achieved by using 10-bit symbols for 8-bit or less characters and using the extra bits for the DC balancing.
Like other ways of transmitting video, there are two different regions: the active region, where pixel data is sent, and the control region, where synchronization signals are sent. The active region is encoded usingtransition-minimized differential signaling, where the control region is encoded with a fixed8b/10b encoding. As the two schemes yield different 10-bit symbols, a receiver can fully differentiate between active and control regions.
When DVI was designed, most computer monitors were still of thecathode-ray tube type that require analog video synchronization signals. The timing of the digital synchronization signals matches the equivalent analog ones, so the process of transforming DVI to and from an analog signal does not require extra (high-speed) memory, expensive at the time.
HDCP is an extra layer that transforms the 10-bit symbols before transmitting. Only after correct authorization can the receiver undo the HDCP encryption. Control regions are not encrypted in order to let the receiver know when the active region starts.
DVI provide one TMDS clock pair and 3 TMDS data pairs in single link mode or 6 TMDS data pairs in dual link mode. TMDS data pairs operate at agross bit rate that is 10 times the frequency of the TMDS clock. In each TMDS clock period there is a 10-bit symbol per TMDS data pair representing 8-bits of pixel color. In single link mode each set of three 10-bit symbols represents one 24-bit pixel, while in dual link mode each set of six 10-bit symbols either represents two 24-bit pixels or one pixel of up to 48-bitcolor depth.
The specification document allows the data and the clock to not be aligned. However, as the ratio between the TMDS clock and gross bit rate per TMDS pair is fixed at 1:10, the unknown alignment is kept over time. The receiver must recover the bits on the stream using any of the techniques ofclock/data recovery to find the correct symbol boundary. The DVI specification allows the TMDS clock to vary between 25 MHz and 165 MHz. This 1:6.6 ratio can make clock recovery difficult, asphase-locked loops, if used, need to work over a large frequency range. One benefit of DVI over other interfaces is that it is relatively straightforward to transform the signal from the digital domain into the analog domain using a videoDAC, as both clock and synchronization signals are transmitted. Fixed frequency interfaces, likeDisplayPort, need to reconstruct the clock from the transmitted data.
The DVI specification includes signaling for reducing power consumption. Similar to the analogVESA display power management signaling (DPMS) standard, a connected device can turn a monitor off when the connected device is powered down, or programmatically if the display controller of the device supports it. Devices with this capability can also attain Energy Star certification.
The analog section of the DVI specification document is brief and points to other specifications like VESA VSIS[16] for electrical characteristics andGTFS for timing information. The motivation for including analog is to keep compatibility with the previousVGA cables and connectors. VGA pins for HSync, Vsync and three video channels are available in both DVI-I or DVI-A (but not DVI-D) connectors and are electrically compatible, while pins for DDC (clock and data) and 5 V power and ground are kept in all DVI connectors. Thus, a passive adapter can interface between DVI-I or DVI-A (but not DVI-D) and VGA connectors.
HDMI is a newer digital audio/video interface developed and promoted by the consumerelectronics industry. DVI and HDMI have the same electrical specifications for their TMDS and VESA/DDC twisted pairs. However HDMI and DVI differ in several key ways.
To promote interoperability between DVI-D and HDMI devices, HDMI source components and displays support DVI-D signaling. For example, an HDMI display can be driven by a DVI-D source because HDMI and DVI-D both define an overlapping minimum set of supported resolutions and frame buffer formats.
Some DVI-D sources use non-standard extensions to output HDMI signals including audio (e.g.ATI 3000-series andNVIDIA GTX 200-series).[17] Some multimedia displays use a DVI to HDMI adapter to input the HDMI signal with audio. Exact capabilities vary by video card specifications.
In the reverse scenario, a DVI display that lacks optional support forHDCP might be unable to display protected content even though it is otherwise compatible with the HDMI source. Features specific to HDMI such as remote control, audio transport, xvYCC and deep color are not usable in devices that support only DVI signals. HDCP compatibility between source and destination devices is subject to manufacturer specifications for each device.
In December 2010,Intel,AMD, and several computer and display manufacturers announced they would stop supporting DVI-I,VGA andLVDS-technologies from 2013/2015, and instead speed up adoption of DisplayPort and HDMI.[18][19] They also stated: "Legacy interfaces such as VGA, DVI and LVDS have not kept pace, and newer standards such as DisplayPort and HDMI clearly provide the best connectivity options moving forward. In our opinion, DisplayPort 1.2 is the future interface for PC monitors, along with HDMI 1.4a for TV connectivity".
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