Casio AT-1 User Manual

— 9 —
Block diagram of DSP and DAC circuit
DSP
LSI105
HG51B155FD
Effect RAM (64K-bit)
LSI107
SRM2264LC90,10
Sound Source ROM
LSI103
TC5316200CP-C106
CE
A0 ~ A19 D0 ~ D15
RA0 ~
RA19
RD0 ~
RD15
RA22
D0 ~ D7
A0 ~ A3
A13
A14
RD
WR
RESET
SOLP
BOK
WOK1
EA0 ~
EA12
ED0 ~
ED15
CS
WE
OE
D0 ~ D15
A0 ~ A12
ECEB EOEB
EWEB
PG
X102
16.384MHz
DAC
LSI101
UPD6376CX
LOUT
ROUT
SOLP: Sound data
BOK: Bit clock
WOK1: Word clock
SI
CLK
LRCK
APO
CCSB
CRDB
CWRB
Pin No. Terminal In/Out Function
96 EWEB Out Write enable signal output for the effect RAM
98 EA13 Out Not used
106 EOEB Out Read enable signal output for the effect RAM
108 VCC7 In +5 V source
111 ECEB Out Chip select signal output for the effect RAM
113 ~ 117 Not used
118 VCC4 In +5 V source
119 GND4 In Ground (0 V) source
120 ~ 122 Not sued
123 ~ 130 ED0 ~ ED7 In/Out Data bus for the effect RAM
131 GND5 In Ground (0 V) source
132 ~ 134 Not used. Connected to ground.
135, 136 Not used

Casio AT-1 Specifications

General

Brand	Casio
Model	AT-1
Category	Electronic Keyboard
Language	English