
AD9995
–29–
off positions. STROBON_FD is the field in which the STROBE
is turned on, measured from the field containing the last SUBCK
before exposure begins.The STROBON_ LN PX register gives
the line and pixel positions with respect to STROBON_FD.The
STROBE off position is programmable to any field, line, and
pixel location with respect to the field of the last SUBCK.
TRIGGER Register Limitations
While the TRIGGER register can be used to perform a complete
exposure and readout operation, there are limitations on its use.
Once an exposure-plus-readout operation has been triggered,
another exposure/readout operation cannot be triggered right
away.There must be at least one idle field (VD intervals) before
the next exposure/readout can be triggered.
The same limitation applies to the triggering of the MSHUT
signal.There must be at least one idle field after the completion
of the MSHUT OFF operation before another MSHUT OFF
operation may be programmed.
The VSUB trigger requires two idle fields between exposure/
readout operations in order to ensure proper VSUB on/off trig-
gering. If the VSUB signal is not required to be turned on and
off in between each successive exposure/readout operation, this
limitation can be ignored.The VSUB Keep-On mode is useful
when successive exposure/readout operations are required.
VD
SUBCK
STROBE PROGRAMMABLE SETTINGS:
1. ACTIVE POLARITY.
2. ON POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME (WITH RESPECT TO THE FIELD CONTAINING THE LAST SUBCK).
3. OFF POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME.
t
EXP
VSG
STROBE 1
2
3
TRIGGER
EXPOSURE
AND STROBE
Figure 31. STROBE Output Programmability
Table XII.VSUB, MSHUT, and STROBE Register Parameters
Register
Length
Range
Description
VSUBMODE[0]
1b
High/Low
VSUB Mode (0 = Mode 0, 1 = Mode 1) (See Figure 29).
VSUBMODE[1]
1b
High/Low
VSUB Keep-On Mode.VSUB will stay active after readout
when set high.
VSUBON[11:0]
12b
0–4095 Line Location
VSUB On Position. Active starting in any line of field.
VSUBON[12]
1b
High/Low
VSUB Active Polarity.
MSHUTPOL[0]
1b
High/Low
MSHUT Active Polarity.
MSHUTPOL[1]
1b
On/Off
MSHUT Manual Enable (1 = Active or Open).
MSHUTON
24b
0–4095 Line/Pix Location
MSHUT On Position Line [11:0] and Pixel [23:12] Location.
MSHUTOFF_FD
12b
0–4095 Field Location
Field Location to Switch Off MSHUT (Inactive or Closed).
MSHUTOFF_LNPX
24b
0–4095 Line/Pix Location
Line/Pixel Position to Switch Off MSHUT (Inactive or Closed).
STROBPOL
1b
High/Low
STROBE Active Polarity.
STROBON_FD
12b
0–4095 Field Location
STROBE ON Field Location, with Respect to Last SUBCK Field.
STROBON_LNPX
24b
0–4095 Line/Pix Location
STROBE ON Line/Pixel Position.
STROBOFF_FD
12b
0–4095 Field Location
STROBE OFF Field Location, with Respect to Last SUBCK Field.
STROBOFF_LNPX
24b
0–4095 Line/Pix Location
STROBE OFF Line/Pixel Position.
REV. 0
OBSOLETE