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