bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 14

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

4
1.0 Functional Description
1.1 Functional Overview
1.1.3 Bt829B Architecture and Partitioning
1.1.4 UltraLock
The Bt829B has been developed to provide the most cost-effective, high-quality
video input solution. It is used for low-cost multimedia subsystems that integrate
both graphics display and video capabilities. The feature set of the Bt829B sup-
ports a video/graphics system partitioning which optimizes the total cost of a sys-
tem configured both with and without video capture capabilities. This enables
system vendors to easily offer products with various levels of video support using
a single base-system design.
cessors, and eventually to single-chip video/graphics processor implementations,
the ability to efficiently use silicon and package pins to support both graphics
acceleration, video playback acceleration, and video capture becomes critical.
This problem becomes more acute as the race towards higher performance graph-
ics requires more and more package pins to be consumed for wide 64-bit memory
interfaces and glueless local bus interfaces.
ways. First, recognizing that YCrCb to RGB color space conversion is a required
feature of multimedia controllers for acceleration of digital video playback, the
Bt829B avoids redundant functionality and allows the downstream controller to
perform this task. Second, the Bt829B can minimize the number of interface pins
required by a downstream multimedia controller in order to keep package costs to a
minimum. The Bt829B can also output all timing and data signals at 3.3 V levels.
capture capability to be added to the base system in a modular fashion using only
a single Integrated Circuit (IC).
typically integrate the scaling function.
The Bt829B and Bt827B employ a proprietary technique known as UltraLock to
lock to the incoming analog video signal. It will always generate the required
number of pixels per line from an analog source in which the line length can vary
by as much as a few microseconds. UltraLock’s digital locking circuitry enables
the VideoStream decoders to quickly and accurately lock on to video signals,
regardless of their source. Since the technique is completely digital, UltraLock
can recognize unstable signals caused by VCR headswitches or any other devia-
tion and adapt the locking mechanism to accommodate the source. UltraLock
uses nonlinear techniques which are difficult, if not impossible, to implement in
genlock systems. And unlike linear techniques, it adapts the locking mechanism
automatically.
As graphics chip vendors move from graphics-only to video/graphics copro-
The Bt829B minimizes the cost of video capture function integration in two
Controller systems designed to take advantage of these features allow video
The Bt827B is targeted at system configurations using video processors which
D829BDSA
VideoStream II Decoders
Bt829B/827B