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2-42 Service Guide
Table 2-4 NMA1 Pin Descriptions
Pin name Number I/O Description
ADFLTR 1 Right input filter
VOCOL 1 O Left voice output
VOCOR 1 O Right voice output
VOCIL 1 I Left voice input
VOCIR 1 I Right voice input
Miscellaneous pins: 14 pins
SYEN 1 I External synthesizer enable input
SYCS 1 O External synthesizer chip select output
SYCLK 1 I External synthesizer clock input or ZV clock input
SYLR 1 I External synthesizer L/R clock input or ZV L/R clock input
SYIN 1 I External synthesizer data input or ZV data input
SYCLKO 1 O External synthesizer master clock output
RSVD 8 Reserved for future use
Others: 27 pins
RXD 1 I+ MIDI Data Receive
TXD 1 O MIDI Data Transfer
/VOLUP 1 I+ Hardware Volume(Up)
/VOLDW 1 I+ Hardware Volume(Down)
X33I 1 I 33.8688MHZ
X33O 1 O 33.8688MHZ
X24I 1 I 24.576MHZ
X24O 1 O 24.576MHZ
AVDD 2 Analog Power Supply(put on +5.0V)
DVDD 3 Digital Power Supply(put on +5.0V or +3.3V)
AVSS 2 Analog GND
DVSS 7 Digital GND