Input Video Pixel Clock Frequency > 170Mhz; Low Vertical Frequency Formats - Analog Devices ADV7619 Reference Manual

ADV7619 Reference Manual
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.

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.
NEW_VS_PARAM, HDMI, Address 0x4C[2]
Enables a new version of vertical parameter extraction.
Function
NEW_VS_PARAM
0
1
HDMI Map
68 85 10
68 86 9B
68 89 03
68 9B 03
68 93 03
68 5A 80
68 9C 80
68 9C C0
68 9C 00
Set
NEW_VS_PARAM
to 0
Figure 2. Low frame rate algorithm
Description
NEW_VS_PARAM disabled
NEW_VS_PARAM enabled
ADV7619 Required Settings Manual
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
ADI Required Write
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
NEW_VS_PARAM
Rev. 1.8 | Page 8 of 14
Set
to 1