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DAC (IC11: 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 IC11.
Pin No.
Terminal
1
SEL
2
D.GND
3
NC
4
DVDD
5
A.GND
6
R.OUT
7, 8
A.VDD
9
R.REF
10
L.REF
11
L.OUT
12
A.GND
13
LRCK
14
LRSEL
15
SI
16
CLK
KEY CONTROLLER (LSI16: 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.
RDAB
WRAB
LSI17
CLKA
µPD65611GB
RESET
Data bus
Address bus
I n / O u t
In
Mode selection terminal. Connected to ground.
In
Ground (0 V) source for the internal digit circuit
—
Not used
In
+5 V source for the internal digital circuit
In
Ground (0 V) source for the right channel
Out
Right channel sound waveform output
In
+5 V source for the internal analog circuit
In
Right channel reference voltage terminal
In
Left channel reference voltage terminal
Out
Left channel sound waveform output
In
Ground (0 V) source for the left channel
In
Word clock input
In
Not used. Connected to ground.
In
Sound data input
In
Bit clock input
Key Controller
LSI16
HG52E35P
CRDB
CWRB
CKI
HGB
CCSB
RESB
SI0
CD0
CD7
SI7
CA0 ~ CA2
— 10 —
Function
KC0
Key scan signal
KC7
FI0
Key input signal
FI7
Keyboard
KC
First contact
FI
SI
Second contact
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