Percussion Generator (Msm6294-02) - Casio SK 8A Service Manual & Parts List

7. PERCUSSION GENERATOR (MSM6294-02)
Containing a internal ROM (128 Kbit) for percussion data, and internal 8 bit DAC (Digital to
Analog Converter), the LSI provides percussion sounds.
Percussion
Out
Pin Function of Percussion Generator
Pin No.
Signal In/Out Function
1
RESET
In
Reset signal input. LOW active.
The terminal holds LOW level at power switch on for initializing the internal
circuit
2
CLK
In
Clock pulse (256 kHz) input
3 No function
4 WR In
Write signal input. LOW active.
The LSI reads the percussion data from the CPU when the terminal is
LOW level.
5
cs
In Chip select signal input.Fixed at LOW level.
6
~ 13 D0~ D7 In Data bus (DO — D7)
14
DVSS
Ground (OV) source for internal digital circuit
15, 16 No function
17
AVSS
Ground (OV) source for internal DAC
18 MIX-0 Out Analog percussion signal output
19 AVDD +5V source for internal DAC
20-27 No function
28 DVDD +5V source for internal digital circuit