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BT869

Multiport YCrCb to NTSC / PAL / SECAM Digital Video Encoder

Conexant Systems 

2.0 Inputs and Timing

2.2 Digital Video Ports

Bt860/861

Multiport YCrCb to NTSC/PAL /SECAM

2.2 Digital Video Ports

Internally, data to the Bt860/861 is treated as either video, overlay, or alpha data.

Video data is the primary visual program content, while overlay data is used for

informational or navigational content displayed over the visual program. Alpha

data controls the pixel blending of the video and overlay content. Sufficient

flexibility exists in the Bt860/861 to allow for a variety of source and blending

configurations and interesting visual effects.

Video data is supplied by either the P (Primary Video) port, or the VID

(Secondary Video) port. Overlay data can be supplied by either the P port or the

OSD (On Screen Display) port. Alpha data can be supplied by the ALPHA port,

or embedded in the two LSBs of the overlay luminance data. Figure 2-1

illustrates the pixel latching and blending mechanism.

Figure 2-1. Pixel Latching and Blending Mechanism

ALPHA 2

OSD 8

P8

VID 8

VIDCLK

VIDVALID

VIDHACT

VIDVACT

VIDFIELD

CLKIN

XTI

XTO

CLKO

PLL

and

Clock

Logic

2

Blend

Detection

4

2

8

Overlay

Stream

OVERLAY_SEL

Pixel

Blender

8

8

Video

VIDEO_SEL Stream

861_042

2-2

Conexant

D860DSA

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