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MTV118 Revision 2.0 01/01/1999

MTV118

MYSON

TECHNOLOGY

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 for-

mats is configured as the state diagram shown in Figure 3 on page 5.

3.2 Address Bus Administrator

The administrator manages bus address arbitration of internal registers or user font RAM during exter-

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

by internal display timing. In addition, the administrator also provides automatic incrementation to the

address bus when external writing occurs 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 a double character height

bit(CHS) and a vertical display height control register(CH6-CH0).The algorithms of a repeating charac-

ter line display are shown in Tables 2 and 3. The programmable vertical size range is 270 lines to max-

imum 2130 lines.

TABLE 1. Configuration of Transmission Formats

Address

b7

b6

b5

b4

b3

b2

b1

b0

Format

Address

Bytes of

Display

Reg.

Row

1

0

0

x

R3

R2

R1

R0

a,b,c

0

0

x

C4

C3

C2

C1

C0

a,b

0

1

x

C4

C3

C2

C1

C0

c

Attribute

Bytes of

Display

Reg.

Row

1

0

1

x

R3

R2

R1

R0

a,b,c

0

0

x

C4

C3

C2

C1

C0

a,b

0

1

x

C4

C3

C2

C1

C0

c

User

Fonts

RAM

Row

1

1

x

x

x

R2

R1

R0

a,b,c

0

0

C5

C4

C3

C2

C1

C0

a,b

0

1

C5

C4

C3

C2

C1

C0

c

Initiate

ROW

COL

c

COL

ab

DA

c

DA

ab

1, X

0,

1

0,

1

1, X

1, X

format (a)

format (b)

format (c)

X, X

0, X

Input = b7, b6

0, 0

FIGURE 3. Transmission State Diagram