- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
213
12.2.8. VS Lock Mode (VSL-S)
VS Lock (VSL-S) synchronizes the camera vertical and horizontal phases to the external VD/HD signal.
A reset operation is performed in the vertical direction, and a PLL operation is performed in the horizontal
direction. The SGMODE setting is A[h]. (See
This is not supported in auto mode (ATMODEON=1[h]).
System Configuration
The master signal is external VD/HD (EXT-VID/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 12.2-26 VS(VSL-S) mode
Table 12.2-25 External Input Signal (VS Lock (VSL-S) mode)
Pin Name(Pin No)
I/O signals
S0(44pin)
EXT-VD(3.3Vpp: digital signal)
S1(46pin)
EXT-HD(3.3Vpp: digital signal)
EXVIDEOY(57pin)
EXVIDEO(58pin)
3.3V connection
CXD3172AR
42
43
88
87
86
46
47
48
44
49
57
58
ESC
I
ES
CO
EC
K
PC
O
M
P
EXV
ID
EO
Y
EX
VID
E
O
S0
S1
S4
S3
S2
MCK
3.3V
LPF
(H-PLL)
VCXO
EXT-HD
(X'tal)
EXT-VD
X'tal
(27.000MHz)