RIVA128 datasheet(39/77 Pages) STMICROELECTRONICS

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128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA 128

39/77

VIDEO PORT

The RIVA 128 Multimedia Accelerator introduces

a multi-function Video Port that has been designed

to exploit the bus mastering functionality of the

RIVA 128. The Video Port is compliant with a sim-

plified ITU-R-656 video format with control of at-

tached video devices performed through the RIVA

128 serial interface. Video Port support includes:

• Windows 95 DirectMPEG API acceleration by

providing:

- Bus mastered compressed data transfer to

attached DVD and MPEG-2 decoders

Local interrupt and pixel stream handling

Hardware

buffer

management

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

Figure 37.

Connections to multiple video modules

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

PCI/AGP

MPCLK

MPAD[7:0]

MPFRAME#

MPDTACK#

MPSTOP#

RIVA 128

Video

decoder

Media Port

Controller

(MPC)

S Video

VMI 1.4

ITU-R-656

DVD

Controller

TV tuner

SDA

SCL

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