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ExSync

Camera Input

LineValid

Camera Output

Notes specific to this mode

Unlike Freerunning mode, the user triggers (separately) both the CAM/CMOS - 2K.LS readout cycle, and the CAM/CMOS - 2K.LS

reset-&-integration cycle. All of the modes other than Freerunning mode allow the user to do this

2 The user initiates a readout cycle by taking ExSync low as shown above. Readout actually begins a time

XFR

" after ExSync is taken low, and lasts 2048 clock cycles

3 The user can read data from the CAM/CMOS - 2K.LS while LineValid is high as shown above and explained in Figure 3.4.1

4 The reset-&-integration cycle to be read out in the next period "n+1" is initiated by ExSync returning high;

integration begins when reset is complete a time "t

Reset

" after ExSync goes high, and continues

for the remainder of "t

LinePeriod

". The user can therefore shorten integration time by increasing "t

Hold

" above

5 The line period is set by the user by returning ExSync low, thereby initiating the next "n+1th" readout cycle

The minimum time that ExSync can be held low is "t

MinSync

" as shown above

7 Integration is cut off when the user takes ExSync low again as shown in the waveforms above

The line period must be greater than or equal to "t

Readout"

plus t

Xfr

", which sets maximum line rate to 50K lines/sec

9 If the user brings the ExSync Camera Input low prior to "tXFR" + "tReadout" after ExSync goes low, then the CAM/CMOS

2K.LS delays initiation of the "n+1th" readout cycle until "t

Readout

"+ "t

XFR

" has elapsed after ExSync last went low

Table 3.4.3 -- Mode 2: ExSync Synchronization

...gives the user asynchronous hardware control over initiation of the camera readout cycle

and over termination of the line period...

...separately gives the user asynchronous hardware control

XFR

LinePeriod

Readout

2048 Clock Cycles

Reset2

Integration

n+1

Data Camera Output

Strobe Camera Output

Line Valid Camera Output

1 2 3 2047 2048

 

MinSync

Hold

Fairchild Imaging • CAM/CMOS-2K.LS Line Scan Camera User’s Manual • Rev A • 21 of 41

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