MTL002 View Datasheet(PDF) - Myson Century Inc

Part Name

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MTL002

XGA Flat Panel Controller

Myson Century Inc 

MYSON

TECHNOLOGY

MTL002

(Rev. 0.95)

3.1.7 Sync Processor

The V/H SYNC processing block performs the functions of Composite signal separation/insertion, SYNC

inputs presence check, frequency counting, polarity detection and control. It contains a de-glitch circuit to

filter out any pulse shorter than one OSC period which is treated as noise among V/H SYNC pulses.

¨ V/H SYNC Frequency Counter

MTL002 can measure VSYNC/HSYNC frequency counted in proper clock and save the information in the

register. Users can read the figure and calculate VSYNC/HSYNC frequency as following formulas:

fvsync = fosc / Nvsync 51/256

fhsync = fosc / Nhsync 58

,Where

fvsync

fhsync

fosc

Nvsync

Nhsync

: VSYNC frequency

: HSYNC frequency

: oscillator clock with 14.31818 MHz

: counted number of VSYNC

: counted number of HSYNC

¨ V/H SYNC Presence Check

This function checks the input VSYNC, where Vpre flag is set when VSYNC is over 40Hz or cleared when

VSYNC is under 10Hz and the input HSYNC, where Hpre flag is set when HSYNC is over 10Khz or cleared

when HSYNC is under 10Hz.

¨ V/H Polarity Detect

This function detects the input VSYNC/HSYNC high and low pulse duty cycle. If the high pulse duration is

longer than that of low pulse, the negative polarity is asserted; otherwise, positive polarity is asserted.

¨ Composite SYNC separation/insertion

MTL002 continuously monitors the input HSYNC. If the input VSYNC can be extracted from it, a CVpre flag is

set. MTL002 can insert HSYNC pulse during Composite VSYNC’s active time and the insertion frequency

can adapt to the original HSYNC’s.

3.1.8 Auto Tune

Auto Tune function consists of Auto Position which automatically centering the screen and Auto Calibration

which contains Phase Calibration, Histogram, Min/Max Value, and Pixel Grab that are described in the

following paragraphs. With such auto adjustment support it is possible to measure the correct phase,

frequency, gain, and offset of ADC. The horizontal and vertical back porches of input image and the

horizontal and vertical active regions can also be measured. Firmware can adjust input image registers

automatically by reading Auto Tune’s registers in single or burst mode.

¨ Auto Position

MTL002 provides Horizontal/Vertical back porch and active region values. Users can use these values to set

input sample registers to aid in centering the screen automatically.

¨ Phase Calibration

MTL002 provides Auto Calibration registers to measure the quality of current ADC’s phase and frequency.

The biggest Auto Calibration registers value means the right value of ADC’s phase and frequency. MTL002

has two kinds of algorithms to calculate Auto Calibration’s value. One is traditional Difference method,

another is MYSON’s proprietary method. The latter one is recommended for a better performance.

¨ Histogram

Histogram is the total number of input pixels below/above one threshold value for individual R, G, B colors.

This advanced function helps Firmware to analyze ADC performance. Usually Firmware can use the

information to measure ADC’s noise margin, adjust its offset and gain, or even aid in the mode detection.

¨ Min/Max Value

Min/Max value is the minimum or maximum pixel value within the specified input active image region for each

RGB channel. This information is usually used to adjust ADC’s offset and gain.

Revision 0.95

-8-

2000/06/14

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