RIVA128ZX Datasheet, PDF (45/85 Pages) STMicroelectronics – 128-BIT 3D MULTIMEDIA ACCELERATOR

128-BIT 3D MULTIMEDIA ACCELERATOR
RIVA128ZX
8 VIDEO PORT
The RIVA128ZX Multimedia Accelerator introduc-
es a multi-function Video Port that has been de-
signed to exploit the bus mastering functionality of
the RIVA128ZX. The Video Port is compliant with
a simplified ITU-R-656 video format with control of
attached video devices performed through the
RIVA128ZX serial interface. Video Port support in-
cludes:
• Windows 95 DirectMPEG API acceleration by
providing:
- Bus mastered compressed data transfer to
attached DVD and MPEG-2 decoders
Figure 45. Connections to multiple video modules
- Local interrupt and pixel stream handling
- Hardware buffer management of com-
pressed data, decompressed video pixel
data and decompressed audio streams
• Supports popular video decoders including the
Philips SAA7111A, SAA7112, ITT 3225, and
Samsung KS0127. The Video Port initiates
transfers of video packets over the internal NV
bus to either on or off screen surfaces as de-
fined in the DirectDraw and DirectVideo APIs.
• Supports filtered down-scaling or decimation
• Allows additional devices to be added
PCI/AGP ^RIVA128ZX
SDA
SCL
MPCLK
MPAD[7:0]
MPFRAME#
MPDTACK#
MPSTOP#
Video
decoder
TV tuner
S Video
Media Port
Controller
(MPC)
VMI 1.4
ITU-R-656
DVD
Controller
8.1 VIDEO INTERFACE PORT FEATURES
• Single 8-bit bus multiplexing among four trans-
fer types: video, VBI, host and compressed
data
• Synchronous 40MHz address/data multiplexed
bus
• Hardware-based round-robin scheduler with
predictable performance for all transfer types
• Supports multiple video modules and one rib-
bon cable board on the same bus
• ITU-R-656 Master Mode
• Video Port
- Simplified ITU-R-656 Video Format -- sup-
ports HSYNC, VSYNC, ODD FIELD and
EVEN FIELD
- VBI data output from video decoder is cap-
tured as raw or sliced data
45/85