CX25834 Ver la hoja de datos (PDF) - Conexant Systems

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CX25834

PCl Video Decoder

Conexant Systems 

master on a single device. Like the Bt848A, the Fusion family

can place video data directly into host memory for video capture

applications and into a target video display frame buffer for video

overlay applications.

Analog Audio/Video in

I2C

Analog

and

Digital

Tuner

OFDM

DVB

Digital

Audio/

Video In

ATSC

MPEG II

All Format

Decoder

(optional)

I2S

CCIR 601

Digital RGB Out

Fusion

878A

GPIO

Bt869

(optional)

Graphics

Memory

System

Memory

PCI

BUS

Disk

Composite

and S-Video

Analog

RGB/VGA

Digital television receiver for the PC

Fusion Software Drivers

Fusion offers a suite of widely fielded software drivers for

Windows 95 and Windows 98. With the VxD drivers, board

developers can support products using either the Windows 95

or Windows 98 operating systems. VxD and WDM drivers provide

video capture, playback and display in accordance with Microsoft’s

Video for Windows and Direct Show 2.0, respectively. Dialog

boxes, tuner, GPIO, and I2C modules can be modified and

customized by board developers.

Fusion software drivers are supported by the industry’s broadest

base of ISV applications commercially available for video editing,

teleconferencing, compression, television on the PC and video

email. Software is available through retail and OEM channels.

What is a PCI Video Decoder?

A PCI bus analog video decoder is used for three

primary PC solutions: video capture and editing,

video teleconferencing, and television receiver cards.

A video signal is generated by a video source, which

can be a camera,VCR or TV tuner. The baseband

video that goes into the PCI decoder is a simple

analog signal that contains video analog data and video

synchronization data, which is used to display the

picture properly at the receiving end. The details of

the signal depend on the video standard used —

NTSC (National Television Standards Committee), PAL

(Phase Alternate Line) or SECAM (Systeme Electronique

Couleur Avec Memoire). To transmit the picture, the

source generates a vertical synchronization signal

(VSYNC). This signal resets the receiver (PC monitor)

so that it begins picture display at the top of the screen.

After the VSYNC signal is sent, the video source

scans the first line of the image. Once the scan line

is complete, the camera generates a horizontal

synchronization signal (HSYNC), which resets the

receiver so that it will display the next line starting

at the left-hand edge of the display. For each line of

the image, a scan line and a horizontal synchronization

pulse are sent. The PCI bus attached to the video

decoder is the access mechanism, or hub, for this video

information traveling to the PC. The need for broadcast

data in the PC is a primary reason analog dedicated PC

television receiver cards are becoming very popular.

The introduction of WebTV for Windows and national

broadcaster support of Vertical Blanking Interval (VBI)

content contribute to addressing the need for a feature

rich, broadcast data function in the PC. PCI video

decoder solutions provide the most effective means

to achieve this.

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