FS403 datasheet(5/104 Pages) ETC2

5 / 104 page

JANUARY 24, 2007

1. Architectural Overview

Overall design principles are included in this section. Details of how to use and setup the FS400 are included in

the Functional Description section, starting on page 75.

RGB video inputs are asynchronously converted to either NTSC/PAL, YUV or RGB video formats. Architecturally,

the FS400 is divided into five major sections:

Video Capture Engine

Clock Processor

Frame Store Controller

Video Encoder Engine

Serial Bus Interface

Besides power and a few external passive components, the FS400 requires only a single 16M external SDRAM

and external clocks to implement a high quality video scan converter.

Either analog or digital inputs (FS403 only) with separate horizontal and vertical sync signals are accepted.

Analog VGA video must be RGB. Digital video (FS403 only) must be 24-bit RGB clocked by external clock,

VGACK_IN.

A wide range of resolution formats can be accepted, including common standards such as 320x240, 640x400,

720x400, 640x480, 800x600, 832x624, 1024x768, 1152x864, 1280x1024, and 1600x1200. Incoming RGB

signals are converted to either the NTSC or PAL TV Standards, 100Hz PAL, or progressive scan VGA, SVGA, or

NTSC. Output video format can be selected to be either composite and Y/C (NTSC and PAL only), or RGB or

YUV (all standards).

Incoming frame rate may range to over 150 Hz according to the table below. The Video Capture engine runs

asynchronously relative to the Video Encoder Engine. An external frame store memory separates the two

engines with write and read access controlled by the FS400.

Transformation operations include overscan, underscan, pan and zoom. Scaling operations are separated by the

frame store with vertical down-sampling incorporated into the Capture Engine and horizontal up-sampling

incorporated into the Encoder Engine.

1.1 Video Capture Engine

Triple 8-bit A/D converters digitize the analog RGB inputs at rates of up to 50 MHz. Internal A/D sample clock,

ADCK is derived from a phase locked loop referenced to the leading edge of horizontal sync. Either positive or

negative sync polarity is accepted.

The selected input (A/D converter outputs or digital RGB) is transcoded by the color matrix into a 16-bit YCRCB

4:2:2 format. A vertical scaler filters the number of incoming video lines by the selected scaling factor. A flicker

filter averages lines to eliminate flicker between lines or boundaries.

The Video Capture Engine is programmable as to the number of horizontal samples it takes. The limiting factor in

the sample rate is the A/D Converters. By programming fewer samples per line, higher incoming data rates can

be accommodated. The following table illustrates the capability:

Active Samples

720 CCIR 601

640

500

Maximum Line Frequency

56kHz

63kHz

80kHz

640 x 480

106Hz

119Hz

152Hz

800 x 600

89Hz

100Hz

128Hz

1024 x 768

70Hz

78Hz

100Hz

1152 x 864

59Hz

66Hz

85Hz

1280 x 1024

53Hz

59Hz

76Hz

1600 x 1200

44Hz

50Hz

64Hz

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