Analog Devices ADV7850 Hardware Manual page 288

start_fe[3:0]
1111
1101
1000
Closer to active video
1
Away from active video
2
start_fo[3:0], Addr 44 (CP), Address 0x80[3:0]
This control is used to shift the position of the start of the odd field edge of the FIELD signal output by the CP core. It stores a signed
value in a twos complement format. start_fo[3:0] is the number of lines by which the start of the odd field edge of the FIELD signal is
shifted (e.g. 0x0D corresponds to a shift of 3 lines towards the active video, 0x05 corresponds to a shift of 5 line away from the active
video).
Function
START_FO[3:0]
0x0 
0x0 to 0x7
0x8 to 0xF
Examples of how to control the Odd field section of FIELD timing signal:
start_fo[3:0]
0000 
0001
0011
0111
1111
1101
1000
Closer to active video
1
Away from active video
2
Rev. A May 2012
Hex Result
0xF 1 HSync shift earlier than default
0xD 3 HSync shift earlier than default
0x8 8 HSync shift earlier than default
Description
Default value
Edge of FIELD signal corresponding to start of odd field is shifted towards active video
Edge of FIELD signal corresponding to start of odd field is shifted away from active video
Hex Result
0x0 No move (default)
0x1 1 HSync shift later than default
0x3 3 HSync shift later than default
0x0 7 HSync shift later than default
0xF 1 HSync shift earlier than default
0xD 3 HSync shift earlier than default
0x8 8 HSync shift earlier than default
2
1
2
288
ADV7850
Note
Minimum ←
Maximum ←
Note
Minimum →
Maximum →
Minimum ←
Maximum ←