Bt860/861
Multiport YCrCb to NTSC / PAL / SECAM
Digital Video Encoder
The Bt860/861 is a multiport digital video encoder with pixel synchronization and
per-pixel blending capabilities. The three 8-bit YCrCb data ports allow for a variety of
video and graphic overlay configurations useful in video set-top box applications.
The Bt860/861 is specifically designed for video systems requiring composite,
Y/C (S-Video), and simultaneous component YUV or RGB (SCART) video signals.
Worldwide video standards are supported, 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, and SECAM. The Bt860 and Bt861 are
functionally identical except that the Bt861 can output the Macrovision 7.x anticopy
algorithm.
Multisource video is a key feature of the Bt860/861. Two general purpose ports
(P and OSD) allow synchronization with sources that can share clock and frame
timing control with the Bt860/861, such as digital video and graphic overlay content
generated by an MPEG video decoder. A third port (VID) is specifically configured to
interface with video decoders such as those in the Conexant VideoStream decoder
family. Any pair of these three ports can be synchronized and blended.
Distinguishing Features
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Six 10-bit DACs with individual power
management
Simultaneous output of YUV, S-Video,
and CVBS, or RGB (SCART), S-Video,
and CVBS
Current drive output DACs for superior
video quality and reduced system cost
Dynamic video load sensing for reduced
power operation
Three sharpness filter options (1,2,3.5 dB
gain) and four reduction filter options
Programmable adjustment of brightness,
contrast, color saturation, and hue
Glueless interface with a video decoder
Three 8-bit YCrCb 4:2:2 inputs for overlay
or blending
ITU-R BT.656, ITU-R BT.601 digital video
input options
NTSC-M, PAL (B,D,G,H,I), PAL-M, PAL-N,
NTSC-443, PAL-Nc, PAL-60 and SECAM
video output
2x upsampling and internal filtering for
reduced cost
Master or slave video timing with
programmable HSYNC* delay
Interlaced/noninterlaced operation
Macrovision 7.x copy protection (Bt861)
Closed Captioning and Extended Data
Services encoding
Teletext encoding (WST system B)
400 kHz serial programming interface
On-board voltage reference
Reduced power modes
Programmable luma delay (two channels)
3.3 V supply, 5 V-tolerant inputs
Copy Generation Management System
(CGMS) support
VARIS-II and Wide Screen Signalling
(WSS) multiple aspect ratio support
Internal color bar generation
Blue field generation
80-pin MQFP package
Bt852, Bt868/869, Bt864A/865A,
Bt866/867
Bt835, Bt829A/B
Digital cable television systems
Satellite TV receivers (DBS/DVB/DSS)
DVD players
Video CD players
Digital cameras
PC add-on cards
Video editing
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Functional Block Diagram
RESET*
SID
SIC
ALTADDR
VREF
FSADJ1
TTXDAT
TTXREQ
VID[7:0]
VIDCLK
VIDHACT
VIDVACT
VIDVALID
VIDFIELD
HSYNC*
VSYNC*
BLANK*
FIELD
ALPHA[1:0]
P[7:0]
OSD[7:0]
CLKO
XTI
XTO
CLKIN
Teletext
Encoder
Serial
Interface
Internal
VREF
10
COMP1
DAC
DAC A
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10
DAC
DAC B
10
Pixel
Sync.
and
Mixing
2x
Upsampling
Mod.
and
Mixer
DAC
DAC C
10
DAC
DAC D
1.3 MHz
LPF
Color
Space
Convert
10
Related Products
DAC
DAC E
DAC
DAC F
10
Applications
XTAL
OSC
PLL
Clock
Generation
Internal
VREF
COMP2
FSADJ2
Data Sheet
D860DSA
July 27, 1999
CONEXANT [ CONEXANT SYSTEMS, INC ]
