RS-232 Control
Scaling Presentation Switcher
YC
B-Y
Y
6
RGB
7
RGB
R-Y
5
Sound System
LCD Projector
Laptop
Figure 1-1 — Typical IN1508 Scaling Presentation Switcher application
DVI video
DVI is a digital transmission standard for high-speed, lossless video interfaces, such as between a computer and a direct digital monitor. The DVI standard, which Silicon Image Corporation also refers to as PanelLink and PanelLink Digital, specifies single link and dual link digital versions for either the digital only (DVI-D) or digital and analog combined (DVI-I) connectors. A single link supports resolutions higher than HDTV at a reduced blanking interval. The dual link configuration supports the higher bandwidth demands of displays that do not support reduced blanking. The IN1508 switcher supports a single link of DVI-D video.
DVI uses a process called transmission minimized differential signaling (TMDS) for sending graphics data to a compatible monitor. TMDS is based on an encoding algorithm that converts 8 bits of data into a 10-bit transition-minimized DC-balanced signal. The DVI standard, as supported by the switcher, allows for a single link of 3 channels (red, green and blue) of data, enabling the use of large pixel format digital display devices.
The IN1508 switcher converts direct digital video to analog RGB video. The switcher accepts a single link of DVI-D video from a computer or other digital video source device on a standard 25-pin female DVI-D connector. The Digital Flat Panel (DFP) video format can be input using a DFP-to-DVI adapter.
IN1508 Scaling Presentation Switcher • Introduction | 1-3 |