MTL005 Просмотр технического описания (PDF) - Myson Century Inc

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MTL005

XGA Flat Panel Controller

Myson Century Inc 

MYSON

TECHNOLOGY

MTL005

Rev 0.9

¨ V/H SYNC Frequency Counter

MTL005 can measure VSYNC/HSYNC frequency counted in proper clocks and save the information in

registers. Users can read it out to calculate VSYNC/HSYNC frequency as in the 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 the low pulse, the negative polarity is asserted; otherwise, positive polarity is asserted.

¨ Composite SYNC separation/insertion

MTL005 continuously monitors the input HSYNC. If the input VSYNC can be extracted from it, a CVpre flag is

set. MTL005 can insert HSYNC pulse during Composite VSYNC’s active time and the insertion frequency

can adapt to original HSYNC’s.

3.1.8 Auto Tune

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

containing Phase Calibration, Histogram, Min/Max Value, and Pixel Grab described as below. With this 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

MTL005 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

MTL005 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. MTL005

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

another is MYSON’s proprietary method. It is suggested to use the latter one for better performance

¨ Histogram

Histogram means 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 this

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 means 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.

¨ Pixel Grab

Pixel Grab means users can grab a single input pixel at any one point. The position of the point can be

programmed by users. This is another traditional method to measure ADC’s phase and frequency.

Revision 0.9

-7-

2000/12/29

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