Focus Enhancements FS456 データシート

The FS453 PC to TV Video Scan Converter provides broadcast-quality scan conversion for graphics 
cards, motherboard chip sets, video game consoles, consumer electronics and other PC-to-TV 
applications.  Compatible with most graphics controller chips (GCC), the FS453 takes in high-resolution 
computer graphics input (VGA through SXGA) and produces SDTV (Standard Definition Television) or 
HDTV (High Definition Television) analog output.  In SDTV mode the FS453 converts, scales, removes 
flicker, interlaces and encodes the data into NTSC or PAL formats.  In HDTV mode, it performs color 
space conversions and then inserts the required syncs for output.  The FS453's patented technology 
enables it to scale the converted image to fill the TV screen and display flicker-free graphics with sharply 
defined text.   

The FS453 provides a glueless digital interface to most GCCs.  It accepts computer-generated digital 
graphics input in RGB or YCrCb format.  The FS453 receives initialization and basic configuration 
information through its I2C*-compatible SIO port with simple register Read/Write commands.  How the 
FS453 actually processes and converts the graphics information depends on the kind of video output 
selected.  (Refer to Figure 1: FS453 Functional Block Diagram on page 5.) 

For example, to create SDTV output the FS453 first changes RGB video to YCrCb.  It uses patented 
technology to scale (in other words, to proportionately increase or decrease) the number of video lines 
and pixels per line to correspond to the specific SDTV standard.  This allows the FS453 to precisely fill 
the user's television screen without adding artifacts such as blank areas, or distorting the graphics image.  
The FS453 uses more patented technology to adaptively remove the flicker effects common to SDTV 
while keeping fine detail (such as text) clear and sharp.  The FS453 then encodes the processed image 
into broadcast quality, interlaced SDTV video and sends it out through the DACs.  For European SCART 
output, the FS453 converts the image into RGB video and sends the R, G and B signals through separate 
DACs.  

To convert high-resolution computer graphics to high resolution HDTV output the FS453 converts the 
digital video (whether RGB or YCrCb format) to YPrPb (analog component video).  It adds Bi- and Tri- 
Level Syncs as required by the selected standard and routes the analog HDTV video through the DACs.   

The FS453 can also provide VGA output.  In this mode, it allows the GCC's RGB images to pass 
unchanged directly through to the DACs.  The HSync and VSync signals must be driven by the GCC.    

Implementing the FS453 in your system will require very few components – just a 27 MHz clock and 
passive parts.  The FS453 uses an 80-lead Quad Flat Pack (PQFP) or an 88-lead Fine-pitch Ball Grid 
Array (FBGA) package and requires power from +1.8V digital and +3.3V analog supplies.  

©2003-4 FOCUS ENHANCEMENTS, INC. 

                                                      

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Note: I

2

C is a registered trademark of Philips Corporation.  The FS453 Serial I/O bus is similar but not identical to the Philips I

2

C 

bus.