BT848 Datasheet, PDF (11/141 Pages) List of Unclassifed Manufacturers – Single-Chip Video Capture for PCI

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
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