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BT848AKPF

Single-Chip Video Capture for PCI

Conexant Systems 

FUNCTIONAL

DESCRIPTION

Functional Overview

Video Capture

Over PCI Bus

The Bt848/848A/849A integrates an NTSC/PAL/SECAM composite & S-Video

decoder, scaler, DMA controller, and PCI Bus master on a single device.

Bt848/848A/849A can place video data directly into host memory for video cap-

ture applications and into a target video display frame buffer for video overlay ap-

plications. As a PCI initiator, Bt848/848A/849A can take control of the PCI bus as

soon as it is available, thereby avoiding the need for on-board frame buffers.

Bt848/848A/849A contains a pixel data FIFO to decouple the high speed PCI bus

from the continuous video data stream. Figure 1 shows a block diagram of the

Bt848/848A/849A, and Figure 2 shows a detailed block diagram of the decoder

and scaler sections.

The video data input may be scaled, color translated, and burst transferred to a

target location on a field basis. This allows for simultaneous preview of one field

and capture of the other field. Alternatively, Bt848/848A/849A is able to capture

both fields simultaneously or preview both fields simultaneously. The fields may

be interlaced into memory or sent to separate field buffers.

The Bt849A includes all the capability in the Bt848A and adds support for WST

decoding (the encoding method for European based Teletext). The Bt849A imple-

ments a significant amount of WST decoding in S/W ensuring a very low cost TV

card for use in locations requiring Teletext

See Table 1 for a comparison of the Bt848/848A/849A.

Supports

Intel Intercast™

The Bt848/848A/849A fully supports the Intel Intercast technology.

Intel Intercast technology combines the rich programming of television and the

exciting world of the Internet on your PC. Imagine watching a news broadcast and

simultaneously getting a Web page providing a historical perspective. Or viewing

a music video and ordering tickets on the Internet for the band’s next appearance

in your area. Or enjoying a favorite show and getting special web pages associated

with that program. Now your PC can let you interact with television in all kinds of

new and exciting ways.

Brooktree®

L848A_A

1

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