MTV048 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MTV048

On-Screen-Display Controller for CRT/LCD Monitor

Unspecified 

MYSON

TECHNOLOGY

MTV048

(Rev 0.9)

The data transmission is permitted to change from format (a) to format (b) and (c), or from format (b) to

format (a), but not from format (c) back to format (a) and (b). The alternation between transmission formats is

configured as the state diagram shown in Figure 3 .

FIGURE 3. Transmission State Diagram

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

external write using format (c).

3.3 Vertical Display Control

The vertical display control can generate 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),

vertical display height control register (CH6-CH0). The algorithms of repeating character line display are

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

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 by using the following equation:

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

Where H = one horizontal line display time

TABLE 2. Repeat Line Weight of Character

CH6 – CH0

Repeat Line Weight

CH6, CH5 = 11

+18*3

CH6, CH5 = 10

+18*2

CH6, CH5 = 0x

+18

CH4 = 1

+16

CH3 = 1

+8

CH2 = 1

+4

CH1 = 1

+2

CH0 = 1

+1

Rev 0.9

-5-

2001/03/15

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