Vbs Lock Mode (Vbslhr) - Sony SS-HQ1 Application Notes

12.2.11. VBS Lock Mode (VBSLHR)

VBS Lock (VBSLHR) synchronizes the camera vertical, horizontal, and subcarrier phases to the external video
signal. A reset operation is performed in the vertical and horizontal directions, and a PLL operation is performed
on the subcarrier.
The SGMODE setting is 4[h]. (See Table 12.2-5.)
This is not supported in auto mode (ATMODEON=1[h]).
Only a limited number of operation modes can be used with VBSLHR. For details, see appendix 13.1 ("External
Synchronization Evaluation Results").
System Configuration
The master signal is an external video signal (EXT-VIDEO). A 1Vpp video signal (analog) is input to
EXVIDEOY (pin 57) and EXVIDEO (pin 58). The external video luminance signal (EXT-VIDEO-Y) input to
EXVIDEOY (pin 57) is divided inside the CXD3172AR between a vertical direction signal (EXT-VD) and
horizontal direction signal (EXT-HD). EXT-VD resets the CXD3172AR's internal vertical direction counter. The
EXT-HD signal resets the CXD3172AR's internal horizontal direction counter.
The burst component extracted inside the CXD3172AR from EXT-VIDEO (input to EXVIDEO (pin 58)) is
amplified and digitized, and the resulting signal is phase-compared against the FSC signal.
X'tal oscillation is used for the VCXO on the ECK side. The clock for MCK should be supplied from the VCXO
on the ECK side. A system block diagram is shown in Fig 12.2-35. The external input signal is presented in
Table 12.2-28.
EXT-VIDEO
42 86
MCK
43
CXD3172AR
57 58
LPF
Fig 12.2-35 VBS Lock (VBSLHR) mode
220
- SS-HQ1 Application Notes -
(X'tal=28.636)
VCO LPF
87 88
S2 47
48
S3
49
S4
44 46
Ver.1.0.0 January 7, 2005
(SC)
ANALOG
SHIFTER
3.3V