cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 266
cx25870
Manufacturer Part Number
cx25870
Description
Video Encoder With Adaptive Flicker Filtering And Hdtv Output
Manufacturer
Conexant Systems, Inc.
Datasheet
1.CX25870.pdf
(291 pages)
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Appendix E HDTV Output Mode
E.2 Allowable Interfaces for HDTV Output Mode
E-2
E.2 Allowable Interfaces for HDTV Output Mode
The interface that the CX25870/871 must use in HD Output Mode is either type
of video timing slave interface. In this configuration, the HSYNC* and VSYNC*
signals must be received as inputs while the BLANK* signal’s usage is optional.
The encoder cannot transmit the timing signals that initiate the start of a line or
the start of a frame in this mode at all. The CX25870/871 can provide a reference
clock output—CLKO, or not transmit it, as needed. The EN_OUT bit will control
whether or not a CLKO signal is active.
interface if the graphics controller outputs the digital codes for the analog
blanking level. For analog RGB component video outputs, the digital code for
blanking is 00 hex for digital R, G, and B. For offset analog RGB component
video outputs, the digital code for blanking is 10 hex for the digital R, G, and B
pixel inputs. Finally, for analog Component YP
for blanking is 10 hex for digital Y and 80 hex for digital Pr and Pb.
codes, then a BLANK* signal is a necessary part of this interface.
The BLANK* signal will not be required for the HDTV Output Mode
If the graphics controller does not possess the ability to output specific digital
Conexant
Flicker-Free Video Encoder with Ultrascale Technology
B
P
R
video outputs, the digital code
CX25870/871
100381B
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