P & D Digital Connector Pin locations
The Plug and Display [P&D] Bus uses a number of electrical
interfaces. A digital interface is mandatory, with an optional Analog
interface. A VESA DDC2 interface is mandatory; in addition, an optional
USB and/or a IEEE 1394 [FireWire] may be provided.
P&D is a TMDS based standard, released in 1996.
The analog interface may use either: RGB with Vsync and Hsync, or RGB
video with composite sync.
The DDC interface uses the I2C interface bus, as DDC Data for SDL,
and DDC Clock as SCL. The DDC interface is the minimum requirement to
comply with the P&D standard.
Video signals may be Type 1 [RS-170], Type 2 [RS-343], Type 3
[Euro] or Type 4 [VESA]. The video types define their signal amplitude
and polarity, which is not listed here.
The P&D interface has a possible clock rate of 112MHz at a maximum
cable distance of 10 meters. How ever a 10 meter cable exceed the USB
operating rate, and does exceed the FireWire distance between devices of
4.5 meters. The P&D bus supports DDC2, but is not compatible with
DDC1.
A Monitor using another connector type may be compatible with P&D bus
providing it also supports DDC.
Analog Monitors using a 15-pin D
connector, 13W3 connector, or a BNC
connector may not be compatible due to the lack of DDC capability.
| Pin Number | Signal Name | Pin Number | Signal Name |
| 1 | TMDS Data 2+ | 16 | USB Data + |
| 2 | TMDS Data 2- | 17 | USB Data - |
| 3 | TMDS Data2 Return | 18 | 1394 Outer Shield / Change Power Return |
| 4 | Unused | 19 | 1394 Vg |
| 5 | Unused | 20 | 1394 Vp |
| 6 | Unused | 21 | TMDS Data0+ |
| 7 | TMDS Clock Return | 22 | TMDS Data0- |
| 8 | Change Power+ | 23 | TMDS Data0 Return |
| 9 | 1394 Pair A Data- | 24 | Unused |
| 10 | 1394 Pair A Data + | 25 | DDC Return |
| 11 | TMDS Data1+ | 26 | DDC Data [SDA] |
| 12 | TMDS Data1- | 27 | DDC Clock [SCL] |
| 13 | TMDS Data1 Return | 28 | +5 volts |
| 14 | TMDS Clock + | 29 | 1394 Pair B Clock+ |
| 15 | TMDS Clock - | 30 | 1394 pair B Clock- |
| Pin Number | Signal Name | Pin Number | Signal Name |
| 1 | TMDS Data 2+ | 16 | USB Data + |
| 2 | TMDS Data 2- | 17 | USB Data - |
| 3 | TMDS Data2 Return | 18 | 1394 Outer Shield / Change Power Return |
| 4 | Hz and Vt Sync return | 19 | 1394 Vg |
| 5 | Horizontal Sync / Composite Sync | 20 | 1394 Vp |
| 6 | Vertical Sync | 21 | TMDS Data0+ |
| 7 | TMDS Clock Return | 22 | TMDS Data0- |
| 8 | Change Power+ | 23 | TMDS Data0 Return |
| 9 | 1394 Pair A Data- | 24 | Stereo Sync |
| 10 | 1394 Pair A Data + | 25 | DDC / Stereo Sync Return |
| 11 | TMDS Data1+ | 26 | DDC Data [SDA] |
| 12 | TMDS Data1- | 27 | DDC Clock [SCL] |
| 13 | TMDS Data1 Return | 28 | +5 volts |
| 14 | TMDS Clock + | 29 | 1394 Pair B Clock+ |
| 15 | TMDS Clock - | 30 | 1394 pair B Clock- |
| C1 | red Video Out | C1 | Green Video Out |
| C3 | Pixel Clock | C4 | Blue Video Out |
| C5 | Video / Pixel Clock Return | -- | -- |
Additional Personal Computer Video Interfaces
MDA [Monochrome Display Adapter]: was established by IBM as part
of the original Personal Computer [PC]. MDA is a monochrome-only,
text-only standard, allowing text display at 80x25 characters.
OBSOLETE.
CGA [Color Graphics Adapter]: The CGA standard [1981] supports
several different modes; the highest quality text mode is 80x25
characters in 16 colors. The monitors are digital with a composite signal
which is at TTL logic levels; Hs, Vs, and RGBI all at TTL logic levels.
OBSOLETE.
DVI
[Digital Visual Interface]: DVI interfaces are currently in full
production and can handle digital or analog signals.
EGA
[Enhanced Graphics Adapter]: This EGA standard [1984] offered
improved resolutions and more colors than CGA. EGA allowed graphical
output up to 16 colors (chosen from a palette of 64) at screen
resolutions of 640x350, or 80x25 text with 16 colors, all at a refresh
rate of 60 Hz. The monitors have a digital interface. OBSOLETE.
VGA [Video Graphics
Array]: VGA [1987] is a superset of EGA, incorporating all EGA modes.
Older displays sent digital signals to the monitor, while VGA (and later)
send analog signals. This change allowed for more color
precision.
XGA [Extended
Graphics Array]: IBM introduced the XGA interface in 1990 as a
successor to its 8514/A display.
SVGA [Super VGA] offers more colors and
resolutions, but really does not exist as a single standard. The primary
standard refers to the BIOS, and how the computer talks to the monitor.
VESA Display Data Channel [DDC] is a VESA standard that defines how to
read certain pins in a standard SVGA monitor to query the monitor's
capabilities.
FPDI [Flat Panel Display Interface] describes the electrical
layer, logical layer, and connector interface between flat panel displays
and display controllers in an integrated environment. Also FPDI-1, used
with VGA and SVGA [800 x 600]. Followed by FPDI-2
VMChannel [VESA Media
Channel] describes a hardware interface for desktop multimedia
systems. The VMChannel is a multiple master, multiple drop, clock
synchronous interface designed for concurrent pixel data streams.
VMChannel enables the real time flow of uncompressed multimedia pixels in
a bidirectional fashion between multiple video adapters.
Back to the main PC Video Monitor Bus page, or to the main PC Interface Bus page. Use the Buses icon at the bottom of the page to reach the top level index for all bus types. Use the Equipment icon at the bottom of the page to reach manufacturers of PC Monitors.
Electronic Design Key words: Plug and Display [P&D] bus, Video Interfaces, Graphics Adapter, Pinouts, Connector, Signal Names, Computer Bus, Personal Computer, PCAT, Monitor, Display, Physical Interface, Dsub connector, LCD, CRT, Monitor, Display, Port
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