LVAL Enable Signal

Horizontal Active Window

Horizontal Active Window - Start

The horizontal active window starts with the LVAL low-to-high transition.

Horizontal Active Window - Size

The number of Camera Link clock cycles defining the horizontal active window is NOT defined by the duration of the LVAL high. Instead, it is established by the driver from the Width and the DeviceTapGeometry GenApi features of the Remote Device:

Horizontal Active Window [Clock Cycles]= Image width [Pixels]/ (X-Regions × X-Taps)

See also: Tap Geometry Glossary

Horizontal Active Window - End

The data acquisition is immediately suspended after the last pixel data of the Active Window.

The next FVAL low-to-high transition may only occur after:

Parameter	Conditions	Min	Max	Unit
V. A. Window fall to LVAL rise setup	Default settings	2	N/A	Camera Link clock cycle
V. A. Window fall to LVAL rise setup	Filter disabled	1	N/A	Camera Link clock cycle

The next LVAL low-to-high transition may only occur after!

LVAL anti-glitch filter

To increase the robustness against degraded Camera Link transmission, the LVAL input is fitted with an anti-glitch filter.

The LVAL anti-glitch filter is enabled by default. It rejects LVAL pulses shorter than 2 Camera Link clock cycles.

NOTE:

When the anti-glitch filter is enabled, the counts of glitches on Channel links X, Y and Z are reported respectively in the features ChannelXGlitchCount, ChannelYGlitchCount and ChannelZGlitchCount. These counters are 16-bits wide and restart to 0 when overflowed. The command ChannelXYZGlitchCountReset resets the counters of the 3 Channel links.

The LVAL digital filter can be disabled by setting the Device module features AntiGlitchFilterSelector to LVAL and then AntiGlitchFilterEnable to False.

NOTE:

This allows LVAL pulses of 1 Camera Link clock cycle to be accepted.

Parameter	Conditions	Min	Max	Unit
LVAL pulse duration	Default settings	2	N/A	Camera Link clock cycle
LVAL pulse duration	Filter disabled	1	N/A	Camera Link clock cycle