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BT848AKPF

Single-Chip Video Capture for PCI

Conexant Systems 

FUNCTIONAL DESCRIPTION

Functional Overview

Bt848/848A/849A

Single-Chip Video Capture for PCI

Vertical Blanking Interval

Data Capture

Bt848/848A/849A provides a complete solution for capturing and decoding Verti-

cal Blanking Interval (VBI) data. The Bt848/848A/849A can operate in a VBI Line

Output Mode, in which the VBI data is only captured during select lines. This

mode of operation enables concurrent capture of VBI lines containing ancillary

data and normal video image data.

In addition, the Bt848/848A/849A supports a VBI Frame Output Mode, in

which every line in the video frame is treated as if it was a VBI line. This mode of

operation is designed for use with still frame capture/processing applications.

I2C Interface

The Bt848/848A/849A provides a two-wire Inter-Integrated Circuit (I2C) inter-

face. As an I2C master, Bt848/848A/849A can program other devices on the video

card, such as a TV tuner. Serial clock and data lines, SCL and SDA are used to

transfer data at a rate of 100 Kbits/s.

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L848A_A

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