
ADV8003 Hardware Manual
Rev. B, August 2013
211
data.
Input
Video 1
Output Video 1
OSD
Scaler
Alpha
Blending
DE
OSD
Core
CSC
Input
Video 1
Output Video 1
OSD
Scaler
Alpha
Blending
DE
OSD
Core
CSC
Input
Video 2
DE
Input
Video 2
DE
Output Video 2
Output Video 2
Figure 74: OSD Scaler and Blending Top Level Diagram
4.2.4.
External Alpha Blending
The ADV8003 features an external alpha blend input which is shared with the input pixel port. The external alpha blend can only be used
in conjunction with the EXOSD TTL input. This allows the option to specify an external alpha blend value for the EXOSD TTL input
channel. The options for routing the external alpha blend value are outlined in
. The external alpha blend function is enabled via
SPI.
4.2.5.
OSD Core
The OSD core generates the internal data for the OSD display. It accesses the DDR2 memory (through a DMA controller) to load the
required resources.
is used to enable the OSD core on the ADV8003.
reg_osd_enable
, OSD,
Address 0xEE00[0]
The enable bit of OSD core.
Function
reg_osd_enable
Description
0
Disables OSD core
1
Enables OSD core
is used to reset the whole OSD core.
osd_reset
, IO,
Address 0x1AFD[1]
This register bit resets the OSD core.
Содержание ADV8003
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