Updither Configuration; Clock Configuration; Figure 39: Updither Operation - Analog Devices ADV8003 Hardware Manual

Refer to Section 2.2.12.3 for more information on the CSC controls for the RX input channel.
2.2.3.

Updither Configuration

The updither block on each of the input channels can be used to increase the bit width of the incoming video. This is useful if the output
video must be a certain bit depth and the input video is below this level. Updither can increase color richness and reduce the effects of
quantization, rounding and truncation which may have been induced on the video data. The updither block can be used in a situation
where the video input to the ADV8003 is in 8-bit form and must be converted to 10-bit or 12-bit for output.
The operation of the updither block can be seen in
converts to a bit width of 14 and then down converts to 12- and 10-bit width.
updither_level[1:0] is used to configure the updither algorithm level. This should be configured depending on the input and output from
the block. For example, if the input video is 8-bit data and the output is 12-bit data, this should be set to the highest level.
updither_level[1:0], IO Map, Address 0x1A0D[5:4]
This signal is used to set the sharpness of the dither block's HPF processing of the video data. The higher the value of this signal, the
sharper the characteristic of the dither block's HPF.
Function
updither_level[1:0]
00
11
2.2.4.

Clock Configuration

This section describes the method of configuring the various clocks of the ADV8003 using the automatic controls video_in_id[7:0],
exosd_in_id[7:0] and rx_in_id[7:0]. These controls can be employed to automatically configure the internal clocks for the following:
• Pixel de-repetition/front-end formatter clock configuration (main and secondary TTL channels and Serial Video Rx channel)
•
Timing generation for inputs with AV-codes (main and secondary TTL channels only)
• ACE configuration (main TTL channel only)
•
VBI ancillary data (main TTL channel only)
In any of these modes, the video_in_id[7:0],
Rev. B, August 2013
Figure 39. When converting to a higher bit width, the ADV8003 updither block first
8-bit video source 8-bit video source
down dithering down dithering
down dithering down dithering

Figure 39: Updither Operation

Description
Least sharp
Sharpest
exosd_in_id[7:0] and
8 to 14 bit 8 to 14 bit
up dithering up dithering
12-bit video output 12-bit video output
14 to 12 bit 14 to 12 bit
10-bit video output 10-bit video output
12 to 10 bit 12 to 10 bit
rx_in_id[7:0] controls must be configured.
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ADV8003 Hardware Manual