Table of Contents
Advertisement
1.3. Advanced EDID Management
Each DVI sink (e.g. monitors, projectors, plasma displays, and switcher inputs)
must support the EDID data structure. Source BIOS and operating systems are
likely to query the sink using DDC2B protocol to determine what pixel formats and
interface are supported. DVI standard makes use of EDID data structure for the
identification of the monitor type and capabilities. Most DVI sources (VGA cards,
set top boxes, etc) will output DVI signal after accepting the connected sink's EDID
information. In case of EDID readout failure or missing EDID the source will not
output DVI video signal.
DA2DVI-Pro provides Lightware's Advanced EDID Management function which
helps system integration. The built-in EDID Manager stores and emulates 100
EDID plus the EDID of the display device which is connected to DVI OUTPUT 1.
Memory addresses from 01 to 50 are factory presets, while memories from 51 to
99 are user programmable. The DA2DVI-Pro stores the EDID of the monitor or
projector connected to DVI OUTPUT 1 in a non-volatile memory.
The EDID emulated on the input can be copied from the DA2DVI-Pro's memory
(static EDID emulation) or from the attached monitor (dynamic EDID emulation).
For example, the DA2DVI-Pro can be set up to emulate the device, which is
connected to DVI OUTPUT 1, and the EDID automatically changes, if the monitor
is replaced with another display device (as long as it has a valid EDID).
Info
The user is not required to disconnect the DVI cable to change an EDID as
opposed to other manufacturer's products. EDID can be changed even if source is
connected to the input and powered ON.
1.4. Pixel Accurate Reclocking
DA2DVI-Pro reclocks the signal on all outputs using Lightware's sophisticated Pixel
Accurate Reclocking technology. Signal reclocking is an essential important
procedure in digital signal transmission. After passing the reclocking circuit, the
signal becomes stable and jitter-free, and can be transmitted over more equipment
like processors, or event controllers. Without reclocking, sparkles, noise and
jaggies can be seen on the image.
The Pixel Accurate Reclocking circuit eliminates the following errors:
Intra-pair skew: skew between the + and - wires within a differential wire pair (e.g.
Page 8 / 43
Data2- and Data2+). It's caused by different wire lengths or
slightly different wire construction (impedance mismatch) in DVI
cable. It results in jitter.
Advertisement
Table of Contents
