FVAL Enable Signal

The FVAL signal is delivered by the area-scan camera to define the frame timing:

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The FVAL signal goes high together with the first valid line of pixel data. This is the BOF(Begin Of Frame).

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The FVAL signal goes low the next clock after the last valid pixel data of the last line. This is the EOF (End Of Frame).

NOTE:

For some cameras, the FVAL signal is not perfectly aligned.

FVAL timing diagram

If, at the rising edge of FVAL, the acquisition of the frame is enabled, the frame grabber successively:

1.

If required, skips a configurable amount (BOF skipped lines) of Camera Link LVAL cycles,

2.

Enable acquisition of a configurable amount (Acquired lines) of Camera Link LVAL cycles,

3.

Skips the subsequent (EOF skipped lines) Camera Link LVAL cycles until a new FVAL rising edge occurs.