Sharp UP-3301 Service Manual page 55

2-5. VGA controller (MN89303A)
1) Pin Configuration
XIN
GND
AEN
/SBEH
/IOWR
/IORD
/SMEMW
/SMEMR
A21
A20
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
/BIOSEN
/REFRESH
2) Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Gray scale
engine
UD[7:0]
LD[7:0]
83
BACKON
84
LCD panel
LCDON
85
controller
LOGICON
63
LP
64
FO
62
DISP
61
DCLK
1
XIN
124
RESET
126/125
TEST/MINTEST
ADDRESS[21:0]
SD[15:0]
3
AEN
4
SBHE
5
IOWR
6
IORD
Host
7
interface
SMEMW
8
SMEMR
56
IOCHRDY
32
REFRESH
57
MEMCS16
58
IOCS16
UP-3301US CIRCUIT DESCRIPTION
RAM table
Hardware
cursor
Attributer
Video FIFO
LCD/CRT
controller
Memory
interface
Access
attributer
Memory
write
Graphics
buffer
controller
– 53 –
96 MA1
95 MA2
94 MA3
93 MA4
92 MA5
91 MA6
MA7
90
MA8
89
88
MA9
87 VDD
86 GND
LOGICON
85
84 LCDON
83 BACKON
82 LD0
81 LD1
80 LD2
79 LD3
78 LD4
77 LD5
LD6
76
75 LD7
74 VDD
73 GND
UD0
72
71 UD1
70 UD2
69 UD3
UD4
68
67 UD5
66 UD6
65 UD7
MA[9:0]
MD[15:0]
100
RAS
101
UCAS
102
LCAS
103
WE
31
BIOSEN