Pixel Repetition - Analog Devices Advantiv ADV7604 Hardware Manual

7.13 Pixel Repetition

In HDMI mode, video formats with pixel rates below 25 Mpixels/s require pixel repetition in order to
be transmitted over the TMDS link. When the ADV7604 receives this type of video format, it
discards repeated pixel data automatically, based on the Pixel Repetition field available in the AVI
InfoFrame.
Note that when HDMI_PIXEL_REPETITION
clock frequency is divided by (HDMI_PIXEL_REPETITION) + 1.
HDMI_PIXEL_REPETITION [3:0], HDMI Map, Address 0x05, [3:0]
The pixel repetition value can be read directly from the
HDMI Map.
Function
HDMI_PIXEL_REPETITION[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1
Unspecified values are reserved
DEREP_N_OVERIDE, HDMI Map, Address 0x41, [4]
This register allows the user to override the pixel repetition factor. The ADV7604 then uses
DEREP_N instead of
HDMI stream.
Function
DEREP_N_OVERIDE
0
1
Rev. F August 2010
1
Description
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
HDMI_PIXEL_REPETITION
Description
Automatic detection and processing of pixel repetition using AVI
InfoFrames.
Enables manual setting of pixel repetition field. DEREP_N[3:0]
must also be set.
is not zero, video pixel data is discarded and the pixel
HDMI_PIXEL_REPETITION
to discard video pixel data from the incoming
120
ADV7604
register in the