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W9971CF Schematic ( PDF Datasheet ) - Winbond Electronics

Teilenummer W9971CF
Beschreibung Video Graphics Controller With TV Encoder
Hersteller Winbond Electronics
Logo Winbond Electronics Logo 




Gesamt 9 Seiten
W9971CF Datasheet, Funktion
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W9971CF
GENERAL DESCRIPTION
Winbond s W9971CF is a highly-integrated VLSI providing high performance graphics acceleration
and TV-quality full screen motion video acceleration for IBM PCs or compatibles. The W9971CF
integrates an NTSC/PAL TV encoder with S-Video or composite video for flicker-free and glueless
TV output. An on-chip RAMDAC and a dual programmable clock synthesizer with a 170 MHz pixel
data rate are also integrated into the chip to simplify system design and reduce cost.
The W9971CF is a high-performance graphics accelerator specially designed for Microsoft
Windows, Mac OS, IBM OS/2, and DOS-based applications. In addition to 100% IBM VGA register-
level compatibility, the W9971CF incorporates a 64-bit graphics engine (GE) to accelerate drawing
functions such as bit block transfer (BitBLT), line drawing, clipping, and hardware cursor
manipulation.
The W9971CF s integrated video accelerator (VA) features high-quality video filtering, bilinear
interpolating scaling along both the X and Y axes, color space conversion and overlay keying. In
addition to accelerating software video playback, the W9971CF also provides an advanced
multimedia video interface for glueless interfacing to major TV decoders such as the Philips
SAA711X and the Brooktree Bt815A/7A/9A. The 16-bit baseline VESA Advanced Feature
Connector (VAFC) and the 8-bit bidirectional IBM Feature Connector are also supported for legacy
video applications. By performing scaling and color space conversion on the fly, the W9971CF
provides high-quality video playback in 1024 × 768 256-color mode with only 1 MByte of DRAM.
The W9971CF integrates a high quality NTSC/PAL TV encoder to directly interface to TV sets. It
allows an NTSC/PAL TV to be used as the primary or secondary display for Windows-based and
video playback applications. The TV output capabilities are required for Microsoft Entertainment PC
97 designs that do not come bundled with a VGA monitor. These capabilities provide a more
realistic game, video, and multimedia experience for users who use large-screen TVs.
The flexible display memory interface design of the W9971CF allows system designers to select
various types of DRAMs, including 128K × 8, 128K × 16, 256K × 4, 256K × 8, and 256K × 16. These
DRAMs may be used in either fast page or extended data out (EDO) modes.
The W9971CF supports a glueless interface with the 32-bit PCI Local Bus. Green PC power
management is supported via VESA Display Power Management Signaling (DPMS) and power-
down of the on-chip RAMDAC and clock synthesizers. VESA DDC1 and DDC2 smart monitor
control is also supported.
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W9971CF Datasheet, Funktion
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W9971CF
Filtering
The video accelerator provides horizontal RGB or YUV filtering to reduce noise and aliasing
artifacts in the video data stream
Cropping
A rectangular cropping window is supported in the video accelerator for subsampling the incoming
video data stream. Only video located in the cropping window can be stored into the off-screen
buffer.
Alpha Blending
Alpha blending is supported for overlaying the primary stream and secondary stream. The alpha
value can be 1 bit or 3 bits. The 1-bit alpha depth overlaying (also known as a software key) is
supported only for the pixel format of RGB 1:5:5:5, where the alpha bit value of 0 is transparent and
value of 1 is opaque.
An overlay control register specifies the 3-bit alpha value for the primary stream (Kp) and
secondary stream (Ks). Note that Kp + Ks must be 8. The blending equation is [Pp × Kp + Ps × Ks]
/8, where Pp is the primary stream pixel data and Ps is the secondary stream pixel data.
Overlay Control
The overlay controller provides control for overlaying of four input sources: the primary stream
(normally the graphics data), secondary stream, blending stream, and FC/VAFC pass-through data
stream. When the hardware cursor is active, it is overlaid on top of all image streams. The
W9971CF supports a range of advanced keying forms; these include window key, color key, chroma
key, software key (1-bit alpha overlaying in RGB 1:5:5:5 format), external key (FC/VAFC only), and
a logical combination of these keys.
Dual Video Windows
Two video windows may be simultaneously displayed on the monitor. This makes the W9971CF
highly suitable for video conferencing applications. If the two video windows are placed at different
scan lines, they can be scaled separately with different factors.
Flicker Filter and TV Encoder
The W9971CF incorporates an integrated TV encoder, flicker-free filtering, and vertical scaling for
TV output. It directly interfaces with a composite or S-video connector for NTSC or PAL TV output.
The software reads the TV output hardware to detect whether a TV is attached to either S-Video or
composite output connectors. This allows the operating system and graphics drivers to support a
correct display output during the startup sequence (i.e. the correct resolution and refresh rate to
use), and for applications to adjust their user interfaces to the screen s capabilities. Simultaneous
output to a VGA monitor and TV are also supported. If a VGA monitor is not attached, the TV output
works automatically as the primary display. The same image can be simultaneously displayed on
the VGA monitor and TV. Alternatively, graphics may be displayed on the VGA monitor while
display video is displayed on the TV. The graphics adapter must default to modes compatible with
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