FOCUS Enhancements FS453 User Manual download pdf (Page 6)

FS453/4 AND FS455/6 DATA SHEET: HARDWARE REFERENCE

FOCUS Enhancements Semiconductor

2.1.1 Input to Output Conversion Matrix

Table 1 below lists some commonly used input modes and the correspondingly supported output modes.

SDTV input dimensions are completely configurable, subject only to pixel clock range limitations.

Output Configuration

Input Configuration

SDTV HDTV

Pixels Lines NTSC

@59.94Hz

PAL

@50Hz

480p

@60Hz

720p

@60Hz

1080i

@60Hz

640 - 720 480

∗ ∗ ∗

(a)

640 - 720 576

∗ ∗

800 600

∗ ∗

1024 768

∗ ∗

1280 720

∗

(b)

∗

(b)

∗

(a)

1920 1080

∗

(c)

Table 1: Input to Output Conversion Matrix

Notes:

(a) No scaling supported

(b) Subject to the maximum 150 MHz pixel rate

2.2 Color Space Converter

The programmable Color Space Converter receives either RGB or YCrCb data from the input port. If the

data is RGB, it is converted to YCrCb using programmable coefficients. Each of the Y, Cr, and Cb

components can then be independently scaled in amplitude with programmable multipliers. This

programmability supports both SDTV and HDTV color space matrices.

2.3 Patented 2D Scaler

The Patented 2D Scaler receives data from the Color Space Converter. It performs vertical (up or down)

scaling based on the value programmed in the VSC (Vertical Scaling Coefficient) register, offset 06h. It

performs horizontal (down) scaling based on the downscale value programmed in the HSC (Horizontal

Scaling Coefficient) register, offset 08h.

Because different video standards call for different numbers of lines and different numbers of pixels per

line, scan converters add or subtract lines and areas to fit graphics images onto different sizes of TV

screens. Most scan converters use simple line-dropping algorithms and fixed aspect ratios.

Unfortunately, these techniques can introduce shape-distorting artifacts and surround the actual image

with blank areas.

The FS453, however, uses patented technology that can scale the graphics image without creating

artifacts. The patented 2D Scaler can independently upscale or downscale an image in both the

horizontal (pixels) and vertical (lines) directions. Its scaling functions provide equal weight to all pixels

and lines in the source material for all scaling factors. This allows users to perfectly fit the graphics image

to their TV screens without adding scaling artifacts or large blank borders.

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FOCUS Enhancements FS453 User Manual Page 6

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