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The following table shows the pin functions of LSI101.
DAC (IC103: UPD6379GR)
The DAC receives 16-bit serial data output from the CPU. 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
and output them to each channel separately.
Pin No.
Terminal
In/Out
Function
1
TXD0
Out
MIDI signal input
2
RXD0
In
MIDI signal output
3
SCK0
Out
APO (Auto Power Off) signal output
4 ~ 6
Not used. Connected to ground.
7
AVCC
In
Ground (0 V) source
8, 9
AN0, AN1
Not used. Connected to ground.
10
AGND
In
Ground (0 V) source
11
BCK
Out
Bit clock output
12
SO
Out
Serial sound data output
13
LRCK
Out
Word clock output
14
GND
In
Ground (0 V) source
15, 16
XLT0, XLT1
In/Out
20 MHz clock input/output
17
VCC
In
+5 V source
18, 19
MD0, MD1
In
Mode selection terminal. Connected to ground.
20
RSTB
In
Reset signal input
21
NMI
In
Power ON signal input
22
INT
Not used. Connected to ground.
23 ~ 30
FI0 ~ FI3
SI0 ~ SI3
In
Key input signal
31 ~ 38
KC0 ~ KC7
Out
Key scan signal output
39 ~ 46
FI4 ~ FI7
SI4 ~ SI7
In
Key input signal
47 ~ 50
In
Not used.
51
FI10
In
Button input signal input
52
SI10
In
Not used
53 ~ 55
KI0 ~ KI2
In
Button input signal input
56
MWNB
Out
Not used.
57 ~ 76
MA1 ~ MA17
Out
Address bus
77
MCSB0
Out
Chip enable signal output for the sound source ROM
78, 79
Out
Not used
80
VCC
In
+5 V source
81
GND
In
Ground (0 V) source
82
MRDB
Out
Read enable signal output for the sound source ROM
83 ~ 98
MD0 ~ MD15
In/Out
Data bus
99
PLE
Out
Latch enable signal output for LED latches
100
P17
In
APO cancellation signal input
