STG3005A2STR 查看數據表（PDF） - STMicroelectronics

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STG3005A2STR

128-BIT 3D MULTIMEDIA ACCELERATOR

STMicroelectronics 

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

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