CMV2000 datasheet(68/87 Pages) AMSOSRAM

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CMV2000

Functional description

Datasheet

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• v8-00 • 2025-Jul-07

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7.6.3

Horizontal line effect during exposure start

Information:

This chapter is just applicable for Version 3.

When the exposure of an image frame is started while a previous image frame is read out this

action may become visible in the image frame currently read out. The effect is visible in the line

addressed for read-out at the moment the exposure of the next image frame starts. Depending

on the moment when the exposure starts within the line read-out time, this will result in a bright

or dark offset for the addressed line. This horizontal line artifact is due to the cross-talk of the

global transfer gate pulse on the column read-out.

This problem is solved by changing the sequencer timing. At the moment the global transfer is

pulsed, a programmable number of dummy rows can be inserted in the read-out. This means

that the transfer pulse crosstalk does not influence valid data rows.

The exact internal impact of the new timing depends on the read-out and exposure modes

(PLR, internal or external exposure control…). Externally, the only impact is that the DVAL and

LVAL outputs are not pulsed for a number of row periods. The external system should always

monitor the DVAL, LVAL and FVAL pulses to know when valid pixels, lines and frames

become available. Figure 57 shows the timing (in case of 2 dummy rows).

Figure 57: Timing of DVAL, LVAL and FVAL to avoid horizontal line artifact

By default, no dummy rows are inserted in the read-out. The dummy rows are enabled by

loading the appropriate values to the register inte_sync and dummy.

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