Re: Software triggering a PCDig

[Will Lockhart <will@mvhi.com>]

M.Stein writes:
 > > We're using a line scan camera. The camera has an EXSYNC input which
 > > triggers a single line transfer on the rising edge. Minimum low or
 > > high time is 100ns. I use the EXSYNC output to do this. The PRI output 
 > > is not used.
 > 
 > But after this exposure time (defined by EXT_SYNC_PERIOD_TIME) your camera
 > has also a readout time, where the frame is transfered into the board.
 > Please specify this time in
 > 
 > 	EXSYNC_MIDPOINT_DELAY **AND** PRI_MIDPOINT_DELAY.

The readout time is absolutely determined by the width of the camera
array (2048 pixels) and the frequency of CCLK. So EXSYNC governs the
exposure time and this must be longer than the readout time (plus some 
overhead). Although the PCDig documentation says that the PRI output
is used to control exposure time on Dalsa cameras (we are using a
Dalsa), the camera I have does not have independent exposure control - 
in other words, the line rate controls the exposure time.

 > 						matthias

Will