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Major Chips Description 2-41
2.4.4 Pin Descriptions
Conventions used in the pin description types:
I+: Input Pin with Pull up Resistor
T: TTL-tri-state output pin
Schmitt: TTL-Schmitt input pin
O+: Output Pin with Pull up Resistor
Table 2-4 NMA1 Pin Descriptions
Pin name Number I/O Description
ISA bus interface: 36 pins
D7-0 8 I/O Data Bus
A15-0 12 I Address Bus
AEN 1 I Address Bus Enable
/IOW 1 I Write Enable
/IOR 1 I Read Enable
RESET 1 I Reset
IRQ3,5,7,9,10,11 6 T Interrupt request
DRQ0,1,3 3 T DMA Request
/DACK0,1,3 3 I DMA Acknowledge
Analog Input&Output: 24 pins
OUTL 1 O Left mixed analog output
OUTR 1 O Right mixed analog output
VREFI 1 I Voltage reference input
VREFO 1 O Voltage reference output
AUX1L 1 I Left AUX1 input
AUX1R 1 I Right AUX1 input
AUX2L 1 I Left AUX2 input
AUX2R 1 I Right AUX2 input
LINEL 1 I Left LINE input
LINER 1 I Right LINE input
MIC 1 I MIC input
MIN 1 I Monaural input
TRECL 1 Left Treble capacitor
TRECR 1 Right Treble capacitor
SBFLTL 1 Left SBDAC filter
SBFLTR 1 Right SBDAC filter
SYNSHL 1 Left SYNDAC sample/ hold capacitor
SYNSHR 1 Right SYNDAC sample/ hold capacitor
ADFLTL 1 Left input filter