MTV038N20 View Datasheet(PDF) - Myson Century Inc

Part Name

Description

Manufacturer

MTV038N20

On-screen-display controller for CRT/LCD monitor

Myson Century Inc 

MYSON

TECHNOLOGY

MTV038

(Revision 1.1)

3.2 Address bus administrator

The administrator manages bus address arbitration of internal registers or user fonts RAM during external

data write in. The external data write through serial data interface to registers must be synchronized by inter-

nal display timing. In addition, the administrator also provides automatic increment to address bus when exter-

nal write using format (c).

3.3 Vertical display control

The vertical display control can generates different vertical display sizes for most display standards in current

monitors. The vertical display size is calculated with the information of double character height bit(CHS), verti-

cal display height control register(CH6-CH0).The algorithm of repeating character line display are shown as

Table 2 and Table 3. The programmable vertical size range is 270 lines to maximum 2130 lines.

The vertical display center for full screen display could be figured out according to the information of vertical

starting position register (VERTD) and VFLB input. The vertical delay starting from the leading edge of VFLB,

is calculated with the following equation:

Vertical delay time = ( VERTD * 4 + 1 ) * H

TABLE 2. Repeat Line Weight of Character

CH6 - CH0

CH6,CH5=11

CH6,CH5=10

CH6,CH5=0x

CH4=1

CH3=1

CH2=1

CH1=1

CH0=1

Repeat Line Weight

+18*3

+18*2

+18

+16

+8

+4

+2

+1

Where H = one horizontal line display time

TABLE 3. Repeat Line Number of Character

Repeat Line

Repeat Line #

Weight

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

+1

- - - - - - - -v- - - - - - - - -

+2

- - - -v- - - - - - -v- - - - -

+4

- -v- - -v- - -v- - -v- - -

+8

-v-v-v-v-v-v-v-v- -

+16

- vvvvvvvvvvvvvvvv -

+17

vvvvvvvvvvvvvvvvv -

+18

vvvvvvvvvvvvvvvvvv

Note:" v " means the nth line in the character would be repeated once, while " - " means the nth line in the

character would not be repeated.

3.4 Horizontal display control

The horizontal display control is used to generate control timing for horizontal display based on double char-

acter width bit (CWS), horizontal positioning register (HORD), horizontal resolution register (HORR), and

HFLB input. A horizontal display line consists of (HORR*12) dots which include 360 dots for 30 display char-

Revision 1.1

-6-

2001/8/21

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