Analog Devices ADV7850 Hardware Manual page 268

Function
ch2_sspd_dvalid
0 
1
ch1_cur_sync_src[1:0], Addr 44 (CP), Address 0xB5[1:0] (Read Only)
This readback displays the current synchronization source detected by sync channel 1 SSPD.
Function
ch1_cur_sync_src[1:0]
00 
01
10
11
ch2_cur_sync_src[1:0], Addr 44 (CP), Address 0x4F[1:0] (Read Only)
This readback displays the current synchronization source detected by sync channel 2 SSPD.
Function
ch2_cur_sync_src[1:0]
00 
01
10
11
ch1_cur_pol_hs, Addr 44 (CP), Address 0xB5[3] (Read Only)
This readback indicates the polarity of the HSync/CSync input to the sync channel 1 SSPD.
Function
ch1_cur_pol_hs
0 
1
ch2_cur_pol_hs, Addr 44 (CP), Address 0x4F[3] (Read Only)
This readback displays the polarity of the HSync/CSync input to sync channel 2 SSPD.
Function
ch2_cur_pol_hs
0 
1
ch1_hs_act, Addr 44 (CP), Address 0xB5[4] (Read Only)
This readback indicates activity on the HSync/CSync input to sync channel 1 SSPD.
Function
ch1_hs_act
0 
1
The SSPD section continuously monitors the HSync input signal over timing windows of 2
ch1_hs_act is updated at the end of each window, as follows:
Rev. A May 2012
Description
Sync channel 2 SSPD results not valid for readback
Sync channel 2 SSPD results valid (detection finished)
Description
Not used
Activity detected on HSync and VSync input to sync channel 1 SSPD
CSync detected on HSync input to sync channel 1 SSPD
Activity detected on embedded synchronization input to sync channel 1 SSPD
Description
Not used
Activity detected on HSync and VSync input to sync channel 2 SSPD
CSync detected in HSync input to sync channel 2 SSPD
Activity detected on embedded synchronization input to sync channel 2 SSPD
Description
Negative polarity on HSync/CSync input to sync channel 1 SSPD
Positive polarity on HSync/CSync input to sync channel 1 SSPD
Description
HSync CSync input to sync channel 2 SSPD has negative polarity
HSync CSync input to sync channel 2 SSPD has positive polarity
Description
No activity detected on HSync/CSync input to sync channel 1 SSPD
HSync/CSync input to sync channel 1 SSPD carries an active signal
crystal clock periods (refer to
22
268
ADV7850
Figure 89).