NT68520XF Datasheet, PDF (18/97 Pages) List of Unclassifed Manufacturers – XGA,SXGA Flat Panel Monitor Controller

One-cycle calibration
Vsync
NT68520X,E
F/W set
AUTO_EN
F/W read
AUTO_RDY
H/W start
calibration
F/W clear
AUTO_EN
Multi-cycle Calibration
Vsync
H/W Stop Auto-calibration
F/W set
AUTO_EN
F/W read & clear
AUTO_RDY
F/W read & clear
AUTO_RDY
0
H/W start
H/W restart
H/W restart F/W clear
H/W Stop Auto-calibration
calibration
calibration
calibration AUTO_EN
Auto Gain
Gain value is the Minimum or Maximum pixel value within a specified input image region
for each RGB channel. This function is useful for measuring the noise margin of input
video or for auto-contrast calibrating by adjusting ADC’ s offset and gain.
Programming Steps:
1. Assign the capture area
2. Enable the Auto Gain function
3. Waiting for AUTO_RDY bit
4. Read the Max/Min result
Auto Position
The NT68520 provides the Horizontal/Vertical back porch and active region information.
Users can use these values to set input capture registers to aid centering the screen
automatically, and adjust the ADCPLL’s divider value to figure out the correct input pixel
frequency.
2003/4/15
18
Ver.1.0