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Casio GZ-500 User Manual

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CRDB
CWRB
CKI
CCSB
CD0
CD7
CA0 ~ CA2
First contact
Second contact
KC0
KC7
FI0
FI7
SI0
SI7
Key input signal
Key scan signal
~
Data bus
Address bus
Key Controller
LSI107
HG52E35P
Keyboard
FI
SI
KC
RD
WR
APO
A13
A14
CLOCK
RESET
RESB
DAC (LSI104: UPD6376GS)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the
melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into
analog waveforms by each channel and output them separately.
The following table shows the pin functions of LSI1.
Pin No.
Terminal
In/Out
Function
1
SEL
In
   Mode selection terminal. Connected to ground.
2
D.GND
In
   Ground (0V) source for the internal digital circuit
3
NC
   Not used.
4
DVDD
In
   +5V source for the internal digital circuit
5
A.GND
In
   Ground (0V) source for the right channel
6
R.OUT
Out
   Right channel sound waveform output
7, 8
A.VDD
In
   +5V source for the internal analog circuit
9
R.REF
In
   Right channel reference voltage terminal
10
L.REF
In
   Left channel reference voltage terminal
11
L.OUT
Out
   Left channel sound waveform output
12
A.GND
In
   Ground (0V) source for the left channel
13
LRCK
In
   Word clock input
14
LRSEL
In
   Not used. Connected to ground.
15
SI
In
   Sound data input
16
CLK
In
   Bit clock input
KEY CONTROLLER (LSI107: HG52E35P)
The key controller generates key scan signals and provides them to the keyboard. By counting the time
between first-key input signal FI and second-key SI from the keyboard, the key controller detects key
velocity. The note number and its velocity data are read at regular intervals by the CPU.