82C931 Datasheet, PDF (22/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
3.3.1 931-AD Mode Signal Descriptions
3.3.1.1 ISA Bus Signals
Signal Name
IOW#
IOR#
AEN
RESET
SA[15:0]
SD[7:0]
DACK0#
DACK1#
DACK3#
DRQ0
DRQ1
DRQ3
GPIO0
EXTROM#
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
IRQ15
GPIO3
Pin No.
49
50
51
84
13:16,
83:72
71:68,
65:62
46,
47,
48
59
60
61
43
54
55
56
53
52
42
Signal/Pin
Type (Drive)
I-TTL-Smt
50KΩ PU
I-TTL-Smt
50KΩ PU
I-TTL-Smt
I-TTL-Smt
50KΩ PD
I/O-TTL
(12mA)
I/O-TTL
(16mA)
I-TTL
50KΩ PU
Signal Description
I/O Write Command
I/O Read Command
DMA Address Enable
System Reset Input
System Address Bus Lines 15 through 0
System Data Bus Lines 7 through 0
DMA Acknowledge Bits 0, 1, and 3
O-TS, 50KΩ PD DMA Request Bits 0, 1, and 3
(12mA)
I/O-TTL, PU
(8mA)
OD, I/O-TTL
(12mA)
General Purpose I/O Bit 0
External EEPROM Enable Jumper Input: Jumper setting is latched
at reset time. (If pin 43 is pulled up, external EEPROM is enabled.)
Interrupt Request Bits 5, 7, and 9 through 11: IRQ7 and IRQ[9:11]
are bidirectional for WSS auto interrupt determination
I/O-TTL
(12mA)
Interrupt Request Bit 15
General Purpose I/O Bit 1
3.3.1.2 MIDI Interface Signals
Signal Name
RXD
TXD
Pin No.
9
10
Signal/Pin
Type (Drive)
I-TTL-Smt
O
(20mA)
Signal Description
Receive Data from 32KBaud MIDI UART Port
Transmit Data to 32KBaud MIDI UART Port
OPTi
®
Page 14
912-3000-035
Revision: 2.1