Analog Devices ADV7619, Справочное руководство

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ADV7619 Reference Manual ADV7619 Required Settings Manual
Rev. 1.8 | Page 8 of 14
3.2 INPUT VIDEO PIXEL CLOCK FREQUENCY > 170MHZ
The following settings are required for input video resolutions with a pixel clock of greater than170 MHz.
HDMI Map
68 85 10 ADI Required Write
68 86 9B ADI Required Write
68 89 03 ADI Required Write
68 9B 03 ADI Required Write
68 93 03 ADI Required Write
68 5A 80 ADI Required Write
68 9C 80 ADI Required Write
68 9C C0 ADI Required Write
68 9C 00 ADI Required Write
4 LOW VERTICAL FREQUENCY FORMATS
To process low frame rate video formats such as 720p24, 720p25 and 720p30, the NEW_VS_PARAM bit should be set. Figure 2 illustrates how
to proceed to detect if this bit must be set.
Figure 2. Low frame rate algorithm
NEW_VS_PARAM
, HDMI, Address 0x4C[2]
Enables a new version of vertical parameter extraction.
Function
NEW_VS_PARAM Description
0
1 NEW_VS_PARAM disabled
NEW_VS_PARAM enabled
DE_REGEN_RAW
indicates a change
in HSYNC
Calculate TOTAL
HORIZONTAL BLANKING
(Hsync front porch +
HSync pulse Width +
Hsync back porch)
If
TOTAL HORIZONTAL BLANKING
is greater than
TOTAL LINE LENGTH/2
Set
NEW_VS_PARAM
to 0
Set
NEW_VS_PARAM
to 1