Analog Devices ADV8005, Hardware Reference Manual

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ADV8005 Hardware Reference Manual UG-707
2.1.9. Mode 8
Mode 8 should be used if:
•
HDMI input video is copy protected
•
Additional processing is required on the new output formats
•
OSD is required on multiple outputs
•
OSD and video scaling are to be kept separate
Figure 18: ADV8005 Mode 8 Configuration
Mode 8 is similar to mode 7 in that OSD is not overlaid on the input video but rather output as the OSD video on its own. This may be required
when HDMI video from an upstream IC is copy protected (as in
Figure 18 ), but the OSD is still required on the analog outputs.
In this mode, the input format is 720p from an external video transceiver and passed to the OSD blend. As the OSD is generated at the same
resolution as the input video, they are just blended. This is then passed to the PVSP where it is upscaled and sent to both HDMI transmitters. If
this data is copy protected, this cannot be passed to the analog outputs. The OSD on its own, however, can be passed directly to these outputs.
In the example in
Figure 18 , the OSD is scaled down to 480p and passed through the PtoI block and sent out on the SD encoder. The difference
between mode 7 and mode 8 is very similar to the difference between modes 2 and 4. Ideally the video and OSD should be scaled separately and
then blended.
OSD
Blend
Build
OSD Scale
OSD
Secondary
VSP
Output
Muxing
HDMI
Tx2
HDMI
Tx1
HD
Encoder
SD
Encoder
Mode 8
DDR2 Memory
Interface
OSD rendered at a single set resolution: 720p
(720p)
(720p)
1080p(OSD)
1080p(OSD)
(480i)
480i(OSD Only)
OSD
Data
Only
(1080p)
Progressive to
Interlaced (480p)
Primary
VSP
720p Video
from
Transceiver
(720p)
Video
36-bit
Input
Port
Exosd
24-bit
Input
Port
Serial
Video
RX
Input
Muxing
Secondary:
Data
Formatting
& CSC
Primary:
Data
Formatting,
CSC & ACE
RX:
Data
Formatting
& CSC
Video
Muxing
OSD
Blend
Build
OSD Scale
OSD
Secondary
VSP
Output
Muxing
HDMI
Tx2
HDMI
Tx1
HD
Encoder
SD
Encoder
Mode 8
DDR2 Memory
Interface
OSD rendered at a single set resolution: 720p
(720p)
(720p)
1080p(OSD)
1080p(OSD)
(480i)
480i(OSD Only)
OSD
Data
Only
(1080p)
Progressive to
Interlaced (480p)
Primary
VSP
720p Video
from
Transceiver
(720p)
Video
36-bit
Input
Port
Exosd
24-bit
Input
Port
Serial
Video
RX
Input
Muxing
Secondary:
Data
Formatting
& CSC
Primary:
Data
Formatting,
CSC & ACE
RX:
Data
Formatting
& CSC
Video
Muxing
Rev. A | Page 35 of 317