ADV8003 Hardware Manual
Rev. B, August 2013
71
Note:
does not list the definitive operation of the device in each mode. For example, in mode 3, it is listed as possible to have two
different output resolutions and just have OSD on a single output. However, using the output muxing, it would also be possible to have a
single output format (1080p in this case) with OSD going to several outputs.
provides
only a guideline for the ADV8003 and
should be used as such. Depending on user requirements, many of these modes could be tailored to a specific solution. Section
2.1.2 to
2.1.9 describe the usable modes of operation as recommended by ADI. These modes should be studied and the appropriate one
selected for a given application.
2.1.1.
Selecting a Mode
General guidelines for selecting a mode of operation involve selecting the location of certain blocks in the VSP section. For example, mode
5 and mode 6 both use the PVSP and SVSP in parallel. However, as the SVSP can only accept progressive formats, input video to the
ADV8003 must be progressive. If interlaced, only the PVSP can be used. Therefore, a note should be kept of the input formats if selecting
these in parallel mode.
The location of the OSD blend core must then be selected. This can be placed before the PVSP and both the input video and OSD can be
scaled at the same time. However, depending on the application, the optimal solution may be to have both the input video and OSD scaled
separately and then blended.
If blending the OSD after the PVSP, the OSD may need to be scaled to different resolutions. This can be done in two ways:
1.
The OSD bitmap images are created at higher resolutions.
2.
The OSD can be rendered at a single resolution and scaled internally in the ADV8003 using the OSD scaler.
There are limitations to both of these methods. Rendering OSDs at larger resolutions increases the system resources required to store
these bitmaps. Alternatively, scaling the OSD internally in the part increases power consumption on the ADV8003.
The optimum solution to this depends on customer requirements and system capabilities. It should be chosen taking these considerations
into account.
Note:
For the following modes of operation, red indicates an active video path and black indicates a path is not used. If, for example, there
are two red dashed lines, video may be available on one or the other but not on both.
2.1.2.
Mode 1
Mode 1 should be used if:
•
Three separate output formats are required
•
Additional processing (BNR, RNR, and so on) is required on the new output formats
•
OSD is required on a single output format (most likely the lowest quality of the converted formats)
Содержание ADV8003
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