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MTV018 Revision 4.0 10/21/1999

MTV018

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 formats is config-

ured 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 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-

TABLE 1. The 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