- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
215
12.2.9. VS Lock Mode (VSL-D)
VS Lock (VSL-D) synchronizes the camera vertical and horizontal phases to the external digital sync signal.
A reset operation is performed in the vertical direction, and a PLL operation is performed in the horizontal
direction. The SGMODE setting is F[h]. (See
This is not supported in auto mode (ATMODEON=1[h]).
System Configuration
The master signal is external digital sync (D SYNC). D SYNC 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 and MCK-frequency-divided HD (MCK-HD) signal are phase-compared inside the
CXD3172AR.
In addition, the 27.000MHz clock is used for input to ECK (pin 88). In this case, the MODESEL (operation
mode) setting is as shown in
. We recommend using X’tal oscillation for the VCXO on the MCK
side.
A system block diagram is shown in
. The external input signal is presented in
Fig 12.2-29 VS Lock (VSL-D) mode
Table 12.2-26 External I/O signal (VS Lock (VSL-D) Mode)
Pin Name(Pin No)
I/O signals
S1(46pin)
D SYNC(3.3Vpp: digital signal)
S0(44pin)
EXVIDEOY(57pin)
EXVIDEO(58pin)
3.3V connection
CXD3172AR
42
43
88
87
86
46
47
48
44
49
57
58
ES
CI
ES
CO
EC
K
PC
O
M
P
E
XVI
DE
O
Y
E
XVI
DE
O
S0
S1
S4
S3
S2
MCK
3.3V
LPF
(H-PLL)
VCO
D SYNC
X'tal
(27.000MHz)