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15
External HD/VD Input Phase Specifications
The phase relationship of the external HD and VD should correspond to the center
phase (i.e., the external HD falling edge) as illustrated in the above diagram.
Allowable frequency deviation of external sync: 15.734 kHz ± 1%
( ± 1% of horizontal sync frequency)
External VD falling edge:
Please input within about 100 clock cycles of the standard center phase.
Note that V sync of the video is output with a delay of about 1H from the external
VD at the time of reset-restart and the external trigger mode.
In the normal mode:
Continuously with the HD period of 63.56 µs and VD period of 16.68 ms.
Phase timing is as illustrated in the above diagram (with only the falling edge
applicable).
In the reset-restart/external trigger mode:
Continuously with the HD period of 63.56 µs. VD (reset) is at an arbitrary timing
with the phase of HD being within the standard of the above diagram.
HD input
HD input
Camera VD
(internal)
Camera VD
(internal)
VD input
(ODD)
VD input
(EVEN)
Input the VD falling
within this range.
Input the VD falling
within this range.