The Enhanced Video Connector Interface bus [EVC] uses a 35-pin
connector defined by the Video Electronic Standards Association
[VESA].
The EVC bus combines both analog and digital signaling. The EVC interface
is designed to carry VGA/RGB, FireWire, audio, and USB signals. The EVC
connector is essentially the same as the DVI connector, except it carries
different signals. The EVC bus is defined by Video Electronic Standards
Association (VESA). The pin out was changed between version 1 and version
2 of the standard to align it with the P & D pinout. The changes
moved signals; Change Power +, and Change Power Return.
A listing on OEM connector manufacturers may be found on the
Connector Manufacturers page.
The table below provides the EVC pinout and signal names for the EVC
connector.
| Pin # | Signal Name | Pin # | Signal Name | Pin # | Signal Name |
|---|---|---|---|---|---|
| 1 | Audio output, Right | 11 | Changing Power + | 21 | Audio input, Left |
| 2 | Audio output, Left | 12 | Changing Power- | 22 | Audio input, Right |
| 3 | Audio output return | 13 | Video input, Y or composite in | 23 | Audio input return |
| 4 | Sync return | 14 | Video input, return | 24 | Stereo sync (TTL) |
| 5 | Horizontal sync (TTL) | 15 | Video input, C in | 25 | DDC return |
| 6 | Vertical sync (TTL) | 16 | USB data + | 26 | DDC data (SDA) |
| 7 | Reserved | 17 | USB data - | 27 | DDC, clock (SCL) |
| 8 | Reserved | 18 | USB/1394 common mode shield | 28 | +5 VDC |
| 9 | 1394 pair A, data - | 19 | 1394 Vg | 29 | 1394 pair B, clock + |
| 10 | 1394 pair A, data + | 20 | 1394 Vp | 30 | 1394 pair B, clock - |
| C1 | Red Video | C2 | Green Video | C3 | Pixel Clock |
| C4 | Blue Video | C5 | Video/PixelGround | - | - |
Not sure if the EVC interface ever caught on. I assume it was an up-grade to the VGA interface.
Some sites state it is the same as the P&D interface.
Additional Video Interfaces
MDA [Monochrome Display Adapter]: 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.
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 was necessary to allow for more color precision.
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.
XGA [Extended Graphics Array]:
IBM introduced [1990] the XGA interface as a successor to its 8514/A
display. The page link provides a
FPDI [Flat Panel Display
Interface] describes the electrical, logical, and connector interface
between flat panel displays and display controllers in an integrated
environment.
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.
Use the Buses icon at the bottom of the page to reach the top
level index for all bus types.
The Equipment icon at the
bottom of the page to reach manufacturers of PC Monitors.
Back to the main PC Video Monitor Bus page, or to
the main PC Interface Bus
page.
Electronic Engineering Key words: EVC bus, Enhanced Video Connector, Video Interfaces, Pinouts, EVC Pinout, Pin out, Pin Outs, Connector, Signal Names, Computer Bus, Monitor, Display, Physical Interface, Connector, Video Electronic Standards Association, VESA, Personal Computer, PC.
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