82C931 Datasheet, PDF (16/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
3.2.1 931-MB Mode Signal Descriptions
3.2.1.1 ISA Bus Interface Signals
Signal Name
IOW#
IOR#
AEN
RESET
SA[15:0]
SD[15:8]
SD[7:0]
DACK0#
DACK1#
DACK3#
DRQ0
DRQ1
DRQ3
DACK5#
DACK6#
DRQ5
DRQ6
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
Pin No.
49
50
51
84
38, 39, 41, 42,
83:72
13:16,
19:22
71:68, 65:62
46
47
48
59
60
61
44
45
32
33
54
55
56
53
52
Signal/Pin
Type (Drive)
I-TTL-Smt,
50KΩ PU
I-TTL-Smt,
50KΩ PU
I-TTL-Smt
I-TTL-Smt,
50KΩ PD
I-TTL
Signal Description
I/O Write Command
I/O Read Command
DMA Address Enable
System Reset Input
System Address Bus Lines 15 through 0
I/O-TTL
(12mA)
I/O-TTL
(16mA)
I-TTL,
50KΩ PU
System Data Bus Lines 15 through 8
System Data Bus Lines 7 through 0
8-Bit DMA Acknowledge Bits 0, 1, and 3
O-TS (12mA), 8-Bit DMA Request Bits 0, 1, and 3
50KΩ PD
I-TTL
16-Bit DMA Acknowledge Bits 5 and 6
O-TS
(12mA)
OD-I/O-TTL
(12mA)
16-Bit DMA Request Bits 5 and 6
Interrupt Request Bits 5, 7, and 9 through 11: IRQ7 and IRQ9-11
are bidirectional for WSS auto interrupt determination.
3.2.1.2 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 8
912-3000-035
Revision: 2.1