Plug and Display [P&D] Bus Pinout and Signal names. Display/Monitor interface

Plug and Display [P&D]

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.

Although some monitors still have an analog interface [for compatibility], a purely digital interface would be state-of-the-art.

**P & D Digital Connector Pin Out**
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-

Drawing of a 35 pin EVC Connector showing Pin Out or Pin Locations

P & D Digital Connector Pin locations

**P & D Analog/Digital Connector Pin Out**
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
DVI [Digital Visual Interface]: DVI interfaces are currently in full production and can handle digital or analog signals.

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.

... VGA [Video Graphics Array]: VGA [1987] is a superset of EGA, incorporating all EGA modes.

... XGA [Extended Graphics Array]: IBM introduced the XGA interface in 1990.

... EGA [Enhanced Graphics Adapter]: The 1984 EGA standard offered improved resolutions and more colors than CGA.

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.

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.


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