External Alpha Blending; Osd Core; Figure 74: Osd Scaler And Blending Top Level Diagram - Analog Devices ADV8003 Hardware Manual

data.
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
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.
reg_osd_enable 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
0 
1
osd_reset is used to reset the whole OSD core.
osd_reset, IO, Address 0x1AFD[1]
This register bit resets the OSD core.
Rev. B, August 2013
DE DE
DE DE
Input Input
Video 1 Video 1
Input Input
Video 2 Video 2

Figure 74: OSD Scaler and Blending Top Level Diagram

Description
Disables OSD core
Enables OSD core
OSD OSD
Core Core
CSC CSC
OSD OSD
Scaler Scaler
Output Video 1 Output Video 1
Alpha Alpha
Blending Blending
Output Video 2 Output Video 2
Table 97. The external alpha blend function is enabled via
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ADV8003 Hardware Manual