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GATE ARRAY (LSI17: UPD65611GB)
The gate array provides chip enable signals for DSP, Key Controller, and Working Storage RAM. The LSI
also generates scan signals of the button switches with K0O and K0C signals from the CPU.
K0O
K0C
A4 ~ A15
CLK
Each pin function of the LSI is listed below.
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12 ~ 16, 18 ~ 22
17
23
24
25
26
27
KO0 ~ KO15
LSIB
WRAB
RDAB
Gate Array
UPD65611GB
LSI17
HGB
CLKA
SAMPB
Terminal
I n / O u t
K0C
In
APOB
In
RDB
In
WRB
In
WRAB
Out
CLK
In
LSIB
Out
RDAB
Out
RESET
Out
LED1
—
LED0
—
KO0 ~ KO9
Out
GND
In
NC
—
GND
In
CLKA
Out
GND
In
HGB
Out
— 12 —
KI1 ~ KI4
Button Switch
Matrix
DSP
CCSB
HG51B155FD
CWRB
LSI11
CRDB
CWRB
Key Controller
CRDB
HG52E35P
CCSB
LSI16
CKI
Working Storage RAM
CS
TC55257DFL-70L
LSI15
Function
Primary signal for KO0 ~ KO15
APO signal from CPU
Read enable signal from CPU
Write enable signal from CPU
Write enable signal for DSP and Key Controller
Clock pulse from CPU
DSP chip select signal
Read enable to DSP and Key Controller
DSP and Key Controller reset signal
Not used
Not used
Button switch scan signals
Ground (0 V) source
Not used
Ground (0 V) source
16 MHz Clock pulse for Key Controller
Ground (0 V) source
Key Controller chip select signal
To CPU
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