82C931 Datasheet, PDF (40/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
Table 5-6 MC Indirect Registers (cont.)
7
6
5
4
3
MCIR6
MPU-401:
0 = Disable
1 = Enable
MPU-401 base address select:
00 = 330
01 = 320
10 = 310
11 = 300
MIDI Interface Register (WO)
MPU-401 interrupt select:
00 = IRQ9 10 = IRQ5
01 = IRQ10 11 = IRQ7
2
Reserved
MCIR7
Semaphore Software Register (Software use only)
D7
D6
D5
D4
D3
D2
MCIR8
Reserved Register
1
Windows
sound system
mode:
0 = Disable
1 = Enable
0
Default = 00h
Sound Blaster
mode:
0 = Disable
1 = Enable
Default = 00h
D1
D0
Default = 00h
MCIR9
Digital
power-down:
0 = Normal
1 = Power-
down
Analog
power-down:
0 = Normal
1 = Power-
down
Test Control Register
Reserved
Software
reset:
0 = Disable
1 = Enable
Default = 00h
MCIR10
Playback reset:
0 = Normal
1 = Reset (play-
back data
path clear,
active high)
Capture reset:
0 = Normal
1 = Reset (cap-
ture data
path clear,
active high)
PNP test mode:
0 = Normal
1 = Test (PNP
logic is set
to Sleep
mode)
Test Control Register
Reserved
Default = 00h
MCIR11
Playback DMA
pending?
0 = No
1 = Yes
Capture DMA
pending?
0 = No
1 = Yes
MPU interrupt
pending?
0 = No
1 = Yes
Status Register (RO)
CD interrupt
pending?
0 = No
1 = Yes
Capture inter-
rupt pending?
0 = No
1 = Yes
Playback inter-
rupt pending?
0 = No
1 = Yes
Playback FIFO
empty?
0 = No
1 = Yes
Default = 00h
Capture FIFO
empty?
0 = No
1 = Yes
MCIR12
Reserved
Test Register
Digital test
mode output
high/low byte
select (WO)
Default = 00h
Digital test mode output select (WO)
MCIR13
PNP Status Register (RO)
Default = 01h
CSN not zero -
active high:
1 = PNP config-
uration man-
ager assigned
a CSN to
82C931.⁽¹⁾
Modem inter-
face logical
device:
0 = Disable
1 = Enable
IDE logic
device:
0 = Disable
1 = Enable
MC logical
device:
0 = Disable
1 = Enable
CONFIG mode:
1 = 82C931’s
PNP logic is in
the CONFIG
mode
ISOLATE
mode:
1 = 82C931’s
PNP logic is in
the ISOLATE
mode
SLEEP mode:
1 = 82C931’s
PNP logic is in
the SLEEP
mode
WAIT4KEY
mode:
1 = 82C931’s
PNP logic is in
the WAIT4KEY
mode
(1) When a CSN is assigned to the 82C931, it switches to the PNP mode and the resource configuration is controlled through the PNP regis-
ters.
OPTi
®
Page 32
912-3000-035
Revision: 2.1