CX25870/871
Video Encoder with Adaptive Flicker Filtering and HDTV Output
Conexant’s CX25870/871 is specifically designed to meet TV out system requirements
for the next-generation desktop PCs, notebook PCs, game consoles and set-top boxes.
With pin and software-forward compatibility to the Bt868/869, manufacturers can
quickly bring to market new solutions that support adaptive flicker filtering, ATSC
High-Definition Television (HDTV) output, and resolutions from 320 x 200 (minimum) to
1024 x 768 (maximum).
Adaptive flicker filtering is a Conexant technology in which the encoder looks at the
characteristics of the video content on a pixel-by-pixel basis and automatically
determines the optimal amount of flicker filtering required. If an end-user wants to work
on a spreadsheet while watching a DVD movie in a window, both the text-intensive
application requiring a lot of flicker filtering and the DVD movie requiring very little
flicker filtering can look their best. The amount of flicker filtering and overscan
compensation is entirely flexible.
The CX25870/871 also provides a 3-wire analog RGB or YP
R
P
B
HDTV output. While
the encoder is in HDTV output mode, the device will automatically insert horizontal
tri-level synchronization pulses and vertical synchronization broad pulses. The
CX25870/871 is compliant with the EIA770-3, SMPTE 274M/293M/296M standards and
supports ATSC HDTV resolutions including 480p, 720p, and 1080i.
All worldwide standard definition outputs are supported, including NTSC-M (N.
America, Taiwan), NTSC-J (Japan), PAL-B,D,G,H,I (Europe, Asia), PAL-M (Brazil), PAL-N
(Uruguay, Paraguay), PAL-Nc (Argentina), PAL-60 (China) and SECAM. The CX25870
and CX25871 are functionally identical, except the CX25871 can output standard
definition video with Macrovision Level 7.1.L1 copy protection capability.
Distinguishing Features
•
HDTV Output Mode (patents pending)
– Compliant with EIA770-3 and
SMPTE274M/293M/296M
standards
– Automatic tri-level sync generation
– Component (YP
R
P
B
) or RGB HDTV
outputs
– Direct YP
R
P
B
or RGB output from
progressive RGB graphics video in
1080i, 720p, 480p ATSC
resolutions
Software and register
forward-compatibility with the
Bt868/869
Ability to accept many different input
data formats:
– 15/16/24-bit RGB multiplexed or
nonmultiplexed
– 16-bit 4:2:2 and 24-bit 4:4:4 YCrCb
multiplexed or nonmultiplexed
– Flexible pixel ordering with various
alternate formats
Worldwide video output support:
NTSC-M, J, 4.43, PAL-B, D, G, H, I, M,
N, Nc, 60, and SECAM
Interlaced and noninterlaced outputs
S-Video output (simultaneous with
composite NTSC, PAL, or SECAM)
SCART RGB or Y/C output for Europe
– 4th DAC is composite video
–
EN50-049
and IEC 933-1 compliant
5-Line vertical filtering scaling for
overscan compensation and flicker
reduction
Adaptive Flicker Filtering for enhanced
image and peaking filters for text
sharpness (patents pending)
CCIR601/ITU-RBT.601 (i.e., 480i) and
CCIR656 compatible input modes
Luma and chroma comb filtering
4 x 10-bit DACs
Programmable power management
Master, pseudo-master or slave timing
operation
Auto detection of TV
44 autoconfiguration modes
Wide-Screen Signaling (WSS) support
for variable clock rates
– Adheres to EIAJ CPR-1024 and
ITU-R TST.1119-1 standards
Full register set readback capability
3.3 V operation with scalable low
voltage graphic controller interface
from 1.8 V to 1.1 V
Buffered crystal clock output pin
Component YUV analog output
Colorstream
TM
(EIA 770.2) and Super
Colorstream
TM
component video
outputs
Macrovision 7.1.L1 copy protection
(CX25871)
Compact 80-pin PQFP package
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Functional Block Diagram
Color
Space
Conversion
#1
24
P[23:0]
Input
DEMUX
Flicker
Filter/
Scaler
FIFO
•
FSADJUST
HSYNC*
VSYNC*
BLANK*
FIELD
SIC
SID
ALTADDR
Timing
Internal
Reference
Serial
Interface
Video
Encoder
Color
Space
Conversion
#2
To Internal
Clocks
DAC
MUX
10-Bit
10-Bit
10-Bit
10-Bit
COMP
VREF
DACA
DACB
DACC
DACD
VBIAS
Clock
Generation
BIAS
GEN
CLKO
CLKI
•
•
•
•
•
•
•
RESET*
SLEEP
SLAVE
PAL
•
•
•
•
•
•
XTALIN
XTALOUT
XTAL
OSC
PLL
XTL_BFO
•
Data Sheet
100381B
September 2001
CONEXANT [ CONEXANT SYSTEMS, INC ]
