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DIGITAL SIGNAL PROCESSOR (LSI3:HG51B155FD)
Upon receipt of note numbers and their velocities, the DSP (Digital Signal Processor) reads sound and
velocity data from the sound source ROM in accordance with the selected tone; the DSP can read rhythm
data simultaneously when a rythm pattern is selected. Then it provides 16-bit serial signals containing data
of the melody, chord, bass, and percussion to the DAC. The DSP also adds the selected effect to the sound
data using a 256k-bit RAM.
The following table shows the pin functions of the DSP.
Pin No.
Terminal
In/Out
Function
1 ~ 8
CD0 ~ CD7
In/Out
Data bus
9, 10
Not used.
11
GND7
In
Ground (0 V) source
12
CK16
Out
24.576 MHz clock output
13
VCC6
In
+5 V source
14
CK0
In
Clock input. Connected to terminal CK16.
15
TCKB
Not used.
16
VCC1
In
+5 V source
17
GND1
In
Ground (0 V) source
18, 19
XT0, XT1
In/Out
24.576 MHz clock input/output. Connected to a crystal oscillator.
20
SGL
In
System control terminal. Single chip system: Open
21
CCSB
In
Chip select signal input
22 ~ 25
CA0 ~ CA3
In
Address bus
26
CE0
In
Not used. Connected to ground.
27
CWRB
In
Write enable signal
28
CRDB
In
Read enable signal
29 ~ 32
Not used.
33
RESB
In
Reset signal input
34
TESB
In
Not used. Connected to +5 V
35 ~ 39
Not used.
40 ~ 49
RD0 ~ RD15
In
Data bus for the ROM1 and ROM2
52 ~ 57
58
RA23
Out
Chip select signal for the ROM1
59
RA22
Out
Chip select signal for the ROM2
60 ~ 73
RA0 ~ RA21
Out
Address bus for the ROM1 and ROM2
75 ~ 82
74
GND5
In
Ground (0 V) source
83
WOK2
Out
Word clock output. Not used.
84
VCC3
In
+5 V source
85
GND3
In
Ground (0 V) source
86
WOK1
Out
Word clock for the DAC
87
SOLM
Out
Serial data output. Not used.
88
SOLP
Out
Serial data output for the DAC
89
BOK
Out
Bit clock output for the DAC
Содержание WK-1800
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