ADE3800XT datasheet(47/138 Pages) STMICROELECTRONICS

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ADE3800

4.9

Data Measurement (DMEAS)

DMEAS provides a number of pixel measurement functions for autosetup (find the best phase, ADC

sampling clock, picture auto-position) and autocolor (autolevel, ADC analog range tuning for black

and white calibration).

Most DMEAS measurement functions are performed within a programmable input image boundary

defined by the top left and bottom right window coordinate registers. The image boundary can be

full screen.

DMEAS also includes an annex block called DE Size and is decribed at the end of this spec.

All unused or reserved bits will return as zero.

The DMEAS block only processes the 7 MSBs of the 10 bit ADC outputs. Consequently the

maximum pixel value seen by DMEAS is FE.

The horizontal and vertical position measurements are relative to the selected reference sync

edges and must be offset before programming SMUX image position, refer to Chapter 4.8: Sync

Multiplexer (SMUX) for more information.

4.9.1

Function Summary

The algorithms grouped together are executed simultaneously.

The Color, Threshold, Mode Control, Window Control, and Output registers are shared for all

measurements, and are used according to the algorithm selected to measure.

4.9.2

Window Control

All measurements occur within a window in a single frame. The window is defined by the upper left

(min_x, min_y) and lower right (max_x, max_y) corners (inclusive). Window coordinates are relative

to Sync pulses. A window defined from (0,0) – (FFF, FFF) would go from sync to sync (full screen).

The sync reference edge selection is programmable.

4.9.3

Algorithm Control

The available measurements are described in detail below. Most algorithms can be run over each or

all color channels. Most algorithms also contain a threshold value to zero out noise and / or amplify

edges.

Algorithm

Mode Ctrl

Result

Color

Thresh

Window Control

Edge Intensity 00

Pixel Sum 00

One Shot

32 bit edge_out

32 bit psum_out

R/G/B/All

Yes

Min / Max 01

Pcd 01

One Shot

8 bit min / 8 bit max 24

bit pcd_out

R/G/B/All

Yes

Hpos / Vpos 02

One Shot

12 bit Hpos_Min

12 bit Hpos_Max

12 bit Vpos_Min

12 bit Vpos_Max

All

Yes

De_Size 03

One Shot /

Free Run

16 bit De_Size_out

1 bit De_Mismatch

None

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