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BT861KRF

Multiport YCrCb to NTSC / PAL / SECAM Digital Video Encoder

Conexant Systems 

Bt860/861

Multiport YCrCb to NTSC/PAL /SECAM

1.0 Functional Description

1.2 Functional Overview

D860DSA

1.2 Functional Overview

The Bt860/861 is a highly programmable 3.3 V multiport digital video encoder

with pixel synchronization and per-pixel blending capabilities. It is equipped with

three 8-bit YCrCb data ports that allow a variety of video and graphic overlay

configurations useful in video set top box applications.

The three 8-bit YCrCb data ports allow two video streams and one

alpha-blended overlay stream. For switching between video sources (such as a

video decoder and an MPEG source), while providing a common OSD interface

using the part’s overlay and alpha capabilities.

The Bt860/861's VID port uses a PLL and FIFO to allow direct interfacing

with asynchronous video sources, such as the Bt835 video decoder.

In slave mode, the Bt860/861 can be configured to accept either

ITU-R BT.656-compliant timing (EAV and SAV codes) or ITU-R BT.601 data

timing (HSYNC* and VSYNC* signals). The Bt860/861 can also act as timing

master, producing ITU-R BT.601 timing.

The Bt860/861 supports worldwide video standards, including:

• NTSC-M (N. America, Taiwan, Japan)

• PAL-B, D, G, H, I (Europe, Asia)

• PAL-M (Brazil)

• PAL-N (Uruguay, Paraguay)

• PAL-Nc (Argentina)

• PAL-60, NTSC-443

• SECAM

The Bt860/861 has six 10-bit current-out video DACs, specifically designed

for video systems requiring the generation of high quality composite, Y/C

(S-Video), and simultaneous component YUV or RGB (SCART) video signals.

Two of the composite output signals can be programmed with a 0–7 clock

luminance delay. The connection status of each DAC can be dynamically

monitored through the serial programming interface.

The Bt860/861 has several low power options, including sleep mode (only the

serial programming interface and PLL are operational), individual DAC disable,

PLL disable, and 3.3 V operation. The 3.3 V digital inputs can be configured to

be 5 V-tolerant.

The luminance upsampling filter is enhanced to provide a narrow transition

region and a low stopband. Programmable luminance sharpness filters provide

0,1, 2, and 3.5 dB peaking options at higher video frequencies, and four reduction

filters are added for smoothed step response. To reduce the complexity of the

required reconstruction filter, 2x upsampling is implemented.

The Bt860/861 can produce internally generated colorbars and blue field

signals.

A 400 kHz serial programming interface (I2C-compatible) is provided for fast

system programming.

The Bt860/861 provides support for Closed Captioning (CC) and Extended

Data Services (XDS), Teletext (WST system B), Copy Generation Management

System (CGMS), VARIS-II, and Wide Screen Signaling (WSS).

The Bt860 and Bt861 are functionally identical except that the Bt861 can

output the Macrovision 7.x anticopy algorithm.

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