External Alpha Blending; Osd Core - Analog Devices ADV8005 Hardware Reference Manual

ADV8005 Hardware Reference Manual
4.2.4.

External Alpha Blending

The ADV8005 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
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 ADV8005.
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.
Function
osd_reset
0 
1
DE DE
DE DE
Input Input
Video 1 Video 1
Input Input
Blending Blending
Video 2 Video 2
Figure 83: OSD Scaler and Blending Top Level Diagram
Table
Description
Disables OSD core
Enables OSD core
Description
Default
Resets OSD core
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OSD OSD
Core Core
CSC CSC
OSD OSD
Scaler Scaler
Output Video 1 Output Video 1
Alpha Alpha
Output Video 2 Output Video 2
90. The external alpha blend function is enabled via SPI.
UG-707