ade3700 STMicroelectronics, ade3700 Datasheet - Page 38

• Manufacturer Part Number: ade3700
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions
• Manufacturer: STMicroelectronics

Data Measurement (DMEAS)
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2.9
2.9.1
2.9.2
2.9.3
Data Measurement (DMEAS)
The Data Measurement (DMEAS) module measures several characteristics of the data and sync
signals. Data measurements are taken over a programmable window as defined by an upper left
(mix_x, min_y) and a lower right (max_x, max_y), which may be the whole frame. Measurements
are programmable either per color channel or over all color channels.
This module computes all measurements of sync and data format that are done in the INCLK
domain. The Sync Measurement module does measurements in the XCLK domain. The INCLKS
per DE measurement does not use the window feature. It measures the number of INCLK per DE
and returns the result for every line.
All unused or reserved bits will return as zero.
Windows are relative to Sync pulses. A window defined from (0,0) - (0xFFF, 0xFFF) would go from
sync to sync. The reference edge to use, rising or falling, is also programmable per X and Y
coordinates. SMUX should be configured to provide a positive polarity sync to the DMEAS block. All
window enables are reset to 0 and will always be reset on the rising or falling edge of the sync
pulse.
Most algorithms can be run over separate or all color channels. Most algorithms also contain a
threshold value to zero out noise and/or amplify edges. Algorithm, Color, Threshold, or Window
Control changes are accepted at the end of a valid measurement so that they do not affect the
current measurement in progress.
Software can request measurements in one of two ways:
In One-shot mode, the block should indicate that the measurement is valid through an auto clear of
the start condition.
In Free-running mode, the block should indicate that the measurement is valid through a polling
bit. In Free-running mode, a Freeze bit is provided to freeze the results. Measurements still continue
with the polling bit active, however, they are not updated if the Freeze bit is set.
Edge Intensity
The Edge Intensity measurement is the sum of the absolute value of the delta between adjacent
pixels. A programmable threshold is applied to zero out noise and amplify edges. Equation:
For all 3 color channels: Sum += Delta_val on Red channel + Delta_val on Green channel +
Delta_val on Blue channel
Pixel Sum
The Pixel Sum is the sum of all selected pixels for either a specific color channel or all color
channels within the window specified.
Minimum/Maximum Pixel
This function reports the minimum and maximum pixel found within the specified window.
1. All measurements, except DE_Size, are performed in One-shot mode, which is synchronous in
2. The DE_Size measurement can be set either to One-shot or Free-running modes. Free-
respect the microcontroller.
running mode is asynchronous in respect to the microcontroller.
Delta_val = abs(pixelA - pixelB) - threshold;
Delta_val = Delta_val < 0? 0: Delta_val;
Sum += Delta_val;
ADE3700