Analog Devices ADV7850 Hardware Manual page 302

Function
ch2_fl_fr_threshold[2:0]
000
001
010 
011
100
101
110
111
cp_lcount_max[11:0], Addr 44 (CP), Address 0xAB[7:0]; Address 0xAC[7:4]
This control is used to set a manual value for the total number of lines in a frame expected by the CP core. This control is used for the
manual configuration of the free run feature. The value programmed here is used for sync channel 1 and is also used for sync channel 2
if ch2_fr_field_length[10:0] is set to 0x000. It is an unsigned value.
Function
cp_lcount_max[11:0]
0x000 
All other values
interlaced, Addr 44 (CP), Address 0x91[6]
This control is used to set the interlaced or progressive mode of the incoming video processed in CP mode.
Function
interlaced
0
1 
Field Line Count is the vertical parameter that holds the ideal number of lines per field for a given video standard. It affects the way CP
handles the unlocked state. If cp_lcount_max[11:0] and ch2_fr_field_length[10:0] are set to 0, the internally used free run line length
value is decoded from the current setting of
For standards not covered by the preprogrammed values, the cp_lcount_max[11:0], ch2_fr_field_length[10:0], and interlaced parameters
must be set to the ideally expected number of lines per field.
Notes:
• cp_lcount_max[11:0] has no effect on the video decoding.
• If neither cp_lcount_max[11:0] nor ch2_fr_field_length[10:0] are programmed, then the Free-run Line Length parameter is
decoded from prim_mode[3:0]
•
If cp_lcount_max[11:0] is programmed and ch2_fr_field_length[10:0] is not, the Free-run Line Length parameter defined by
cp_lcount_max[11:0] and interlaced is used for both channel 1 and channel 2.
• If cp_lcount_max[11:0] is programmed and ch2_fr_field_length[10:0] is also programmed, the Free-run Line Length parameter
defined by cp_lcount_max[11:0] and interlaced is used for channel 1. The Free-run Line Length parameter defined by
ch2_fr_field_length[10:0] is used for channel 2.
Rev. A May 2012
Description
Minimum difference to switch into free run is 36 lines. Maximum difference to switch out of
free run is 31 lines.
Minimum difference to switch into free run is 18 lines. Maximum difference to switch out of
free run is 15 lines.
Minimum difference to switch into free run is 10 lines. Maximum difference to switch out of
free run is 7 lines.
Minimum difference to switch into free run is 4 lines. Maximum difference to switch out of free
run is 3 lines.
Minimum difference to switch into free run is 51 lines. Maximum difference to switch out of
free run is 46 lines.
Minimum difference to switch into free run is 69 lines. Maximum difference to switch out of
free run is 63 lines.
Minimum difference to switch into free run is 134 lines. Maximum difference to switch out of
free run is 127 lines.
Minimum difference to switch into free run is 263 lines. Maximum difference to switch out of
free run is 255 lines.
Description
Ideal number of lines per frame decoded from prim_mode[3:0] and vid_std[5:0] for sync
channel 1
Use programmed value as ideal number of lines per frame in free run decision for sync
channel 1
Description
CP core expects video mode is progressive
CP core expects video mode is interlaced
prim_mode[3:0] and vid_std[5:0].
and vid_std[5:0].
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ADV7850