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2-90 Service Guide
Table 2-15 YMF715 Descriptions (Continued)
Pin name Pins I/O Type Size Function
Multi-purpose Dins: 13 pins
SEL2-0 3 I+ CMOS 2mA Refer to “Multi-purpose pins” section
MP9-0 l0 I+/O TTL 4mA Refer to “multi-purpose pins” section
Others: 27 pins
GPO - GP3 4 IA - - Game Port
GP4- GP7 4 I+ Schmitt 2mA Game Port
RXD 1 I+ Schmitt 2rnA MIDI Data Receive
TXD 1 O TTL 4mA MIDI Data Transfer
/VOLUP 1 I+ Schmitt 2mA Hardware Volume (Up)
/VOLDW l I+ Schmitt 2mA Hardware Volume (Down)
X331 1 I CMOS 2mA 33.8688 MHz
X33O 1 O CMOS 2mA 33.8688 MHz
X24I 1 I CMOS 2mA 24.576 MHz
X24O 1 O CMOS 2mA 24.576 MHz
AVDD 2 - - - Analog Power Supply (put on +5.0V)
DVDD 3 - - - Digital Power Supply (put on +5.0 V or
+3.3V)
AVSS 2 - - - Analog GND
DVSS 4 - - - Digital GND
Note: I+: Input Pin with Pull up Resistor
Schmitt: TTL-Schmitt input pin
T: TTL-tri-state output pin
O+: Output Pin with Pull up Resistor