
MYSON
TECHNOLOGY
MTV004
MTV004 Revision 4.0 06/24/1999
4/9
transmission efficiency. Row and column addresses are incremented automatically when format (c) is applied.
Furthermore, the locations in columns 24-29 should be filled with dummy data.
The MSB (b7) bit is used to distinguish row and column addresses when transferring data from the external
controller. The b6 bit is used to differentiate column addresses for formats (a), (b) and (c), respectively. The
address configuration is shown in Table 1.
Table 1. Address Configuration in Interface
Address
Row
Columnab
Columnc
b7
1
0
0
b6
x
0
1
b5
x
x
x
b4
x
C4
C4
b3
R3
C3
C3
b2
R2
C2
C2
b1
R1
C1
C1
b0
R0
C0
C0
Format
a,b,c
a,b
c
The data transmission is permitted to change from format (a) to formats (b) and (c), or from format (b) to format
(a), but not from format (c) back to formats (a) and (b). The alternation between formats is configured according
to the state diagram shown in Figure 4.
Initiate
ROW
COL
c
COL
ab
DA
c
DA
ab
1, X
0 1
0 0
X X
X X
0 1
1, X
1, X
format (a)
format (b)
format (c)
X, X
0, X
Input = b7, b6
0, 0
Figure 4. Format State Diagram
3.2 Address Bus Administrator
The administrator manages bus address arbitration of display registers (RAM) during external data writing or
internal display control. The external data writing through the serial data interface to RAM must be
synchronized by internal display timing. In addition, the administrator also provides automatic incrementing to
the address bus when external writing using format (c) and the full-screen display control are applied.
3.3 Vertical Control Logic
The vertical logic generates different vertical display sizes for most display standards in current monitors. The
vertical display size is calculated using the information of the double character height bit (CHS) and vertical
display height control registers (CH5-CH0). The algorithm of the repeating character line display is shown in
Tables 2 and 3. The programmable vertical size range is 160 lines to maximum 1260 lines.