VT1621M VIA, VT1621M Datasheet - Page 7

• Manufacturer Part Number: VT1621M
• Description: TV Encoder
• Manufacturer: VIA

The VT1621 and VT1621M are television encoders that accept various RGB or YCrCb pixel data streams from a VGA controller
or MPEG decoder and generates high quality flicker-free composite and Y/C (S-video) signals. Both of these chips contain the
same functionality and register. The only variation is that the VT1621 is Macrovision disabled and the VT1621M is Macrovision
enabled. Both of these chips can accept any digital input format from 512x384 to 800x600. The input data is also compliant with
CCIR656 and CCIR601.
These two TV Encoder chips use VIA’s ProScale technology to provide the most advanced vertical and horizontal scaling for the
display of non-interlaced data on interlaced TV. This ProScale technology also converts the lines of input video stream data to an
appropriate number of output lines for producing a full-screen high quality TV image.
Worldwide video standards are supported, including NTSC-M (North America, Taiwan) NTSC-J (Japan), PAL-B, D, G, H, I
(Europe, Asia), PAL-M (Brazil), PAL-N (Uruguay, Paraguay) and PAL-Nc (Argentina). The VT1621M can output a video with
the Macrovision 7.1 anticopy included video signal.
unauthorized copying of copy protected analog video signals onto a videocassette. All features are software programmable through
a serial bus interface that provides read/write access to all registers.
Revision 1.0 June 17, 2002
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Capture
Interface
Serial
Data
Bus
HSYNC VSYNC
Converter
Vertical Timing
Horizontal &
Space
Color
Figure 1. Functional Block Diagram
CRTC
O
VERVIEW
The Macrovision anti-copy process provides a means to deter any
Deflicker
Scaler
-2-
and
XCLK P_OUT
Clock
PLL
Pixel
Encoder
VT1621 / VT1621M TV Encoder
NTSC/
PAL
DAC
Overview
Y / R
C / G
CVBS / B