VMIVME-7807 VME-7807RC* Intel® Pentium® M-Based VME SBC

high-speed digital connection for visual data types that are display technology

independent.  DVI is a display interface developed in response to the proliferation of

digital flat-panel displays.  For the most part, these displays are currently connected to

an analog Video Graphics Array (VGA) interface and, thus, require a double

conversion.

The digital signal from the computer must be converted to an analog signal for the

analog VGA interface, then converted back to a digital signal for processing by the

flat-panel display.  This inherently inefficient process takes a toll on performance and

video quality and adds cost.  In contrast, when a flat-panel display is connected to a

digital interface, no digital-to-analog conversion is required.

DVI uses Silicon Image's PanelLink, a high-speed serial interface that uses Transition

Minimized Differential Signaling (TMDS) to send data to the monitor.  The DFP and

VESA Plug and Display interfaces also use PanelLink.  For this reason, DVI can work

with these previous interfaces by using adapter cables (depending on the signal

quality of the adapter.)

DVI also supports the VESA Display Data Channel (DDC) and the Extended Display

Identification Data (EDID) specifications.  DDC is a standard communications channel

between the display adapter and monitor.  EDID is a standard data format containing

monitor information such as vendor information, monitor timing, maximum image

size, and color characteristics.  EDID information is stored in the display and is

communicated over the DDC.  EDID and DDC enable the system, display and

graphics adapter to communicate so that the system can be configured to support

specific features available in the display.

DVI Connectors

The DVI connector has 24 pins that can accommodate up to two TMDS links and the

VESA DDC and EDID services.  The DVI specification defines two types of connectors

(see Figure 1):

• DVI-Digital (DVI-D) supports digital displays only (used on the

VMIVME-7807/VME-7807RC)

• DVI-Integrated (DVI-I) supports digital displays and is backward compatible

with analog displays (not supported)

The VMIVME-7807/VME-7807RC use the DVI-I connector with a single TMDS link.

The DVI-I interface accommodates a 12- or 24-pin DVI plug connector or a new type

of analog plug connector that uses four additional pins, plus a ground plane plug to

maintain a constant impedance for the analog RGB signals

Dual Head Video

The VMIVME-7807/VME-7807RC are capable of driving two monitors at the same

time using the Intel 855GME GMCH. The graphics controller allows the use of one

digital monitor connected to the VMIACC-0590/ACC-0590RC or VMIACC-0586/

ACC-0586RC RTMs, routed out the rear I/O P2 connector. The second is a standard

SVGA monitor connected to the front panel of the VMIVME-7807/VME-7807RC,

using a standard DB15 connector.

Dual Head Setup Procedure:

1. Boot Windows 2000.

2. In the windows desktop right click.

3. When the menu appears, scroll down to the ‘Graphics Options’ and then click

on ‘Graphics Properties’. The Intel 82852/82855GM/GME graphics controller

properties menu will appear. From this menu you can choose the display mode

of choice.

The monitors can be displayed in several modes:

• Monitor Mode - In this mode only the SVGA monitor is displayed.

• Digital Mode - In this mode only the Digital is displayed.

• Dual Display Clone Mode - In this mode both the SVGA and the Digital

monitors are displayed, with the desktop the same on both monitors.

• Extended Desktop Mode - In this mode the two monitors are displayed as one

desktop.

4. After making your choice click ‘OK’ to apply the changes.