ADE3800XT datasheet(50/138 Pages) STMICROELECTRONICS

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ADE3800

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4.9.10 V Position Min / Max

Vertical position measures the start and end of video data in lines relative to the reference edge of

vsync.

Data vertical start is defined as the number of lines between the selected edge of vsync and the

“first data pixel”.

First data pixel definition is either:

1. First pixel > a programmable threshold value (normal)

2. First pixel with the absolute value (current pixel – previous pixel) is > a programmable threshold

value

Data vertical end is defined as the number of lines between reference edge of vsync and the “last

data pixel plus one”. The search for the last pixel ends at the end of a window.

Last data pixel plus one is either:

1. Pixel after the last pixel that is > a programmable threshold value (normal)

2. Last pixel with the absolute value (current pixel – previous pixel) is > a programmable threshold

value

To switch between the two threshold methods used in the first and last pixel, a control bit is provided

in the DMEAS_MODE_CTRL register when requesting a measurement.

Measurement Window: The selected pixel area range for y the range is vsync to vsync. The

selected range for x is not applicable.

Color Channels: All color channels are used to find the First / Last line in a frame.

Result: The output at the end of the measurement is two 12 bit numbers, V position Min and V

position Max.

4.9.11 DE Size

DE Size measures the number of inclks per DE.

At the end of the measurement (DE falling edge), the measured value is compared to a

programmed expected value +/- a programmed threshold. If the expected value is within the

threshold the DE_size_mismatch flag is not set. If the measured size is outside of the threshold the

DE_size_mismatch flag is set.

In free run mode the results are updated every line. The DE_size_mismatch flag is set at DE falling

edge and reset at DE rising edge.

In One shot mode the results are updated once and stay that way until they are cleared by software.

The DE_size_mismatch flag can only be cleared when the reset flag bit is set by software.

Result: 16 bit measured value.

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