Filter
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— 11 —
Pin No. Terminal In/Out Function
1 REQB Out Not used.
FI8 ~ FI10,
SI8 ~ SI10
4 VCC In +5 V source
5 CRDB In Read enable signal input
6 CWRB In Write enable signal input
7 CCSB In Chip select signal input
8, 9, 11 T, STBY, W In Not used. Connected to +5 V.
10 RESB In Reset signal input
12 CKI In 10 MHz clock input
13, 14 TMD, TST In Not used. Connected to ground.
15 CKO Out Not used.
16 GND In Ground (0 V) source
17 XIN In Not used. Connected to ground.
18 XOUT Out Not used.
19 TRES In
Not used. Connected to ground.
20 ~ 23, 25 ~ 28 CD0 ~ CD7 In/Out Data bus
24 GND In
Ground (0 V) source
29 ~ 31 CA0 ~ CA2 In Address bus
32 VCC In
+5 V source
33 ~ 39, 41 ~ 43, FI0 ~ FI9,
53 ~ 55, 57 ~ 63 SI0 ~ SI9
40 VCC In
+5 V source
44 ~ 47, 49 ~ 52 KC0 ~ KC7 Out Key scan signal
48, 56 GND In
Ground (0 V) source
64 VCC In
+5 V source
2, 3, 60 ~ 63 In
In
Not used. Connected to +5 V.
Key input signal input
The following table shows the pin functions of LSI16.
AVDD
1 K
1 K 1 K
C471B
C103(H)
AG
AG
1 K
AG
To main volume
-
+
IC203
M5218APR
16 V 10 µ
C333(H)
Q210/211
2SC1740
10 K
50 V 0.47 µ
From the DAC
AVDD
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.