Sega CD II - Page 32

• Block Diagram
TIO/Pl3
PTOO/P20
8UZ/P23
Sl/S81/P03
S<YSBO/P02
SCK/POI
INTO/PIO
INTI /Pl I
INT2/Pl2
INT4/POO
KA0/"60
-KA7/P73
BASIC:
INTERVAL
TIMER
INTW
IC407 CMOS Inverter
IC74HCU04
Parts No. : 314-0571
•TopView
36
PROGRAM
MEMORY
!PROMI
8064 a 8 BITS
ln/2M
DECODE
ANO
CONTROL
RAM
DATA
MEMORY
CLOK STANO
BY C"U
OIVIOER CONTRCL CLOCK
b ~ ~ !
PCL/P22 XTI XT2 XI X2 Vf'9 VD0 VSS 1'l§ET'
•Pin Layout
1A
14
Vee
1Y
SA
2A 3 3 SY
SA
3A 5 5 SY
4A
GND 7 7 4Y
•Truth Table
A
L
H
PIO -P13
P20 -P23
P30 • P33
/MOO·M03
P60·P63
P70-P73
y
H
L