Figure 59: Vertical Parameters For Field 0 - Analog Devices ADV7850 Hardware Manual

field0_vs_back_porch[13:0], Addr 68 (HDMI), Address 0x32[5:0]; Address 0x33[7:0] (Read Only)
This readback displays the total number of half lines in the VSync back porch of Field 0. The Field 0 VSync back porch width is a
vertical synchronization measurement. The unit for this measurement is half lines.
Function
field0_vs_back_porch[1
3:0]
00000000000000 
xxxxxxxxxxxxxx
dvi_vsync_polarity, Addr 68 (HDMI), Address 0x05[4] (Read Only)
This readback indicates the polarity of the VSync encoded in the input stream.
Function
dvi_vsync_polarity
0 
1
Data
Enable
HSYNC
VSYNC
Note: Field 1 measurements should not be used for progressive video modes.
field1_total_height[13:0], Addr 68 (HDMI), Address 0x28[5:0]; Address 0x29[7:0] (Read Only)
This readback displays the total number of half lines in Field 1. The Field 1 total height is a vertical synchronization measurement. This
measurement is valid only when the vertical filter has locked. Field 1 measurements are valid when hdmi_interlaced is set to 1. Field 1
total height is a vertical synchronization measurement.
Rev. A May 2012
Description
Total number of half lines in VSync back porch of Field 0 (divide readback by 2 to get number
of lines)
Total number of half lines in VSync back porch of Field 0 (divide readback by 2 to get number
of lines)
Description
VSync active low
VSync active high
c
a Total number of lines in field 0. Unit is in half lines.
b Actives number of lines in field 0. Unit is in lines.
c VSync front porch width in field 0. Unit is in half lines.
d VSync pulse width in field 0. Unit is in half lines.
e VSync back porch width in field 0. Unit is in half lines.

Figure 59: Vertical Parameters for Field 0

a
d e
174
b
ADV7850