cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 272

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

Appendix E HDTV Output Mode
E.4 Interface Timing between the HDTV Source Device (Master) and CX25870/ CX25871(Timing Slave)
Table E-3. Default State of CX25870/871 Immediately After Switch into HDTV Output Mode
E-8
BLANK*
Optional
Optional
Optional
Input Signals
HSYNC*
H
L
L
received as an input in HDTV Output Mode. Its function is to allow the graphics
controller to tell the encoder when the start of a line occurs. Check the timing
diagrams that appear later in this section for proper HSYNC* timing.
received as an input in HDTV Output Mode. Its function is to allow the graphics
controller to tell the encoder when the start of a frame occurs. Check the timing
diagrams that appear later in this section for proper VSYNC* timing.
Therefore, the CX25870/871 will be in Pseudo-Master interface. To switch into
Slave interface, the user must reset the EN_OUT bit to turn off CLKO.
E-9) must be replicated with actual timing by the MPEG2 Decoder or Display
Processor for the encoder to provide correct HDTV analog RGB or analog
YP
B
In the default format, the HSYNC* signal is active low and must always be
In the default format, the VSYNC* signal is active low and must always be
By default, the clock output signal will be transmitted via the CLKO port.
Table E-2
The timing diagrams found at the end of this Appendix
P
R
VSYNC*
component video outputs.
H
H
L
summarizes the default Pseudo-Master HDTV interface.
Conexant
Active
Active
Active
CLKO
Digital RGB—Analog HD RGB or
Digital YP
DAC Conversion
Start of a New Line
Start of a New Frame
State of Encoder in HDTV Output Mode
R
State of the CX25870/871
P
B
—Analog HD YP
(Figures E-5
B
P
Flicker-Free Video
R
CX25870/871
through
100381B