Mitsubishi SL2U Service Manual page 80

PCB-MAIN(8/8)
HOLD
W
S
C
D
Q
Vss
Vcc
IC7A3 MM74HCT32MTC / TC74VHCT32AFT
1
1A
2
1B
3
1Y
4
2A
5
2B
6
2Y
7
GND
IC705 CAT24WC128J / 24LC128T-I/SN
5
Start/Stop
SDA
Logic
7
WP
6
SCL
State Counters
1
NC
2
NC
3
NC
8
Vcc
4
Vss
IC703 M25P20-VMN6
7
3
Control Logic
1
6
5
2
Address Register
and Counter
4
8
30000h
20000h
10000h
00000h
14
FUNCTION TABLE
VCC
(each gate)
13
4B
INPUTS
OUTPUT
12
4A
Y
A B
L L L
L H H
11
L
4Y H H
10
H H H
3B
H H : HIGH LEVEL
9
3A
L L : LOW LEVEL
8
3Y
Dout ACK
(Open drain)
Word Address Buffers
256
Control Logic XDEC
High Voltage
Generator
I/O Shift Register
256 Byte
Data Buffer
3FFFFh
000FFh
256 Bytes (Page Size)
X Decoder
B-5
Sense Amps
Shift Registers
Column Decorders
512
E2PROM
(256 512)
Data In Storage
High Voltage
&
Timing Control
Status
Register
Size of the
read-only
memory area