Sharp DV-550U Service Manual page 38

DV-550U
12-6-1. Block Diagram
12-7. IC503 IX1479GE
GATE ARRAY
12-7-1. Block Diagram
1G 1
2
1Q1
3
1Q2
GND 4
1Q3 5
1Q4 6
V cc 7
1Q5 8
1Q6 9
GND 10
1Q7 11
1Q8 12
2Q1 13
2Q2 14
15
GND
16
2Q3
2Q4 17
18
V cc
19
2Q5
20
2Q6
GND 21
22
2Q7
23
2Q8
2G 24
DQ
Output
Buffer
Input
Buffer
Y-DECODER
ADDRESS
QUEUE
LATCHES
X-DECODER
ADDRESS
COUNTER
48 1LE
G
47 1D1
Q D
G
46
1D2
Q D
45
GND
G
44 1D3
Q D
G
43 1D4
Q D
42 V cc
G
Q D 41 1D5
G
40
1D6
Q D
39 GND
G
Q D
38 1D7
G
Q D 37
1D8
G
36 2D1
Q D
G
35 2D2
Q D
34 GND
G
Q D
33
2D3
G
32
2D4
Q D
31 V cc
G
30
2D5
Q D
G
29
2D6
Q D
28 GND
G
27 2D7
Q D
G
26
2D8
Q D
25 2LE
DQ
8-15 0-7
Output Input
Buffer Buffer
DATA
QUEUE
ID REGISTER
Register
CSR
Register
ESRs
Data
Comparator
Y GATING/SENSING
12-7-2. Mode change table
Inputs
G LE
H X
L H
L H
L L
H : High level
L : Low level
X : Immaterial
Z : High impedance
Q : Level of Q before the indicated steady input conditions
0
were established.
12-11
Input
Buffer
I/O Logic BYTE#
CE#
OE#
WE#
RP#
RY/BY#
Program Erase
V
PP
Voltage Switch
V
CC
GND
Output Q
D
X Z
L L
H H
X Q
0