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ADE3700

Data Measurement (DMEAS)

2.9.4

Pixel Cumulative Distribution (PCD)

The Pixel Cumulative Distribution (PCD) function reports the total number of pixels greater than (or

less than) a programmable threshold.

To switch between pixels greater than or pixels less than the threshold, a control bit is provided in

the DMM_Mode register when requesting a measurement.

2.9.5

Horizontal Position

The Horizontal Position measures the start and end of video data in INCLKS clock cycles relative to

the posedge of hsync.

The Data Horizontal Start is defined as the number of INCLKS clock cycles between posedge of

hsync and the “first data pixel”.

First data pixel is either:

1. First pixel greater than the programmable threshold value

2. First pixel with the absolute value (current pixel - previous pixel) is greater than the

programmable threshold value

The Data Horizontal End is defined as the number of INCLKS clock cycles between posedge of

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

Last data pixel plus one is either:

1. Pixel after the last pixel that is greater than the programmable threshold value

2. Last pixel with the absolute value (current pixel - previous pixel) is greater than the

programmable threshold value

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

in the DMM_Mode register when requesting a measurement.

The first and last pixels are measured for each line, and the earliest first and latest last for the

selected pixel area are reported out at the end of the measurement. The intention is for “last data

pixel plus one” minus “first data pixel” is to equal the horizontal width of the video format.

2.9.6

Vertical Position

The Vertical Position measures the start and end of video data in hsyncs relative to the posedge of

vsync.

The Data Vertical Start is defined as the number of hsyncs signals between the positive edge of the

vsync signal and the “first data pixel line”.

First data pixel line definition is the first line with at least one pixel that is greater then the

programmable threshold.

The Data Vertical End is defined as the number of hsyncs between posedge of vsync and the “first

blanking line after data plus one”. The first blanking line is detected then confirmed that each

subsequent line contains no data pixels. The confirmation of the first blanking line measurement

ends at the posedge of vsync.

The first blanking line after data definition is the row after the last row with at least one pixel greater

than the programmable threshold.

The first and last data pixel lines are measured within a frame and the earliest first and latest last for

the selected pixel area are reported out at the end of the measurement. The intention is for “data

vertical end plus one” minus “data vertical start” is to equal the vertical height of the video format.

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