ade3800 STMicroelectronics, ade3800 Datasheet - Page 47

• Manufacturer Part Number: ade3800
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions With Embedded Lvds And Rsds Transmitters
• Manufacturer: STMicroelectronics

ADE3800
4.9 Data Measurement (DMEAS)
4.9.1
4.9.2
4.9.3
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
Multiplexer (SMUX)
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.
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.
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.
Edge Intensity 00
Pixel Sum 00
Min / Max 01
Pcd 01
Hpos / Vpos 02
De_Size 03
Algorithm
for more information.
One Shot
One Shot
One Shot
One Shot
One Shot
One Shot /
Free Run
Mode Ctrl
32 bit edge_out
32 bit psum_out
8 bit min / 8 bit max 24
bit pcd_out
12 bit Hpos_Min
12 bit Hpos_Max
12 bit Vpos_Min
12 bit Vpos_Max
16 bit De_Size_out
1 bit De_Mismatch
Result
R/G/B/All
R/G/B/All
R/G/B/All
R/G/B/All
Color
None
Register Description by Block
All
Thresh
Yes
Yes
Yes
No
No
No
Chapter 4.8: Sync
Window Control
Yes
Yes
Yes
Yes
Yes
No
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