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參數資料
| 型號： | 82C931 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Plug and Play Integrated Audio Controller |
| 中文描述： | 即插即用集成音頻控制器 |
| 文件頁數： | 37/64頁 |
| 文件大?。?/td> | 634K |
| 代理商： | 82C931 |
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82C931
912-3000-035
Revision: 2.1
Page 29
OPTi
5.0
Register Descriptions
5.1
Table 5-1 lists the I/O base address registers of the 82C931.
These base addresses are programmable, which assists in
avoiding possible I/O port conflicts among different devices.
I/O Base Addresses
The configuration registers, called MC Indirect Registers,
located via MCBase control most functions of the 82C931. An
indirect addressing scheme is used to access the MC Indirect
Registers.
The MC address (0E0Eh-0EFEh) and data (0E0Fh-0FFFh)
I/O port addresses are fully programmable. The only fixed I/O
port used by the 82C931 is at 0F8Dh.
The remaining I/O base address registers are accessed by
the same type of indexing scheme as MCBase (CPU Direct
I/O R/W).
Table 5-2 gives the register map of the 82C931.
5.2
MCBase is the Direct MC base address register which con-
trols access to the MC Indirect Registers (MCIR1-23).
MCIR1-23 control most of the basic functions of the 82C931
(i.e., CD-ROM select, base decode address select, etc.).
MCBase Register
To avoid possible conflict of I/O ports with different devices,
the 82C931 uses a unique indirect addressing scheme with
the base addresses being programmable. Under this design
scheme, the only fixed I/O port used by 82C931 is at 0F8Dh.
The MC address and data I/O port addresses are fully pro-
grammable, from 0E0Eh-0EFEh (address port) and 0E0Fh-
0FFFh (data port). To access the MC registers:
(1) All MC registers in 82C931 are password protected. To
read or write into the MC registers, the password E4h
must be written into I/O Port 0F8Dh before accessing the
address or data port.
(2) The address and data access port address can be fully
programmable by writing the desired base address
selection into I/O port 0F8Dh bit 4 to bit 0, [b4..b0]. The
port address can be read as ‘111b4, b3..b0, 1110’ for the
address port and ‘111b4, b3..b0, 1111’ for the data port.
Therefore, the possible address and data access ports
can be any one from 0E0Eh-0FFEh (address port) and
0E0Fh-0FFFh (data port).
Table 5-1
82C931 I/O Base Addresses
Table 5-2
82C931 Register Map
Base Register
Function
Address Selections
MCBase
Configuration
0F8D; 0E0[E..F] to
0FF[E..F]
SBBase
Digital Audio Processor
220/240
WSBase
Windows Sound System
530/640/E80/F40
IDEBase
IDE CD ROM
170/370
ALBase
AdLib
388
OPL4Base
OPL4
380
MIDIBase
MPU-401
300/310/320/330
I/O Address
Register Name (Type)
SBBase+00h (or
ALBase+00h)
Left FM Status Port (RO)
SBBase+00h (or
ALBase+00h)
Left FM Register Address Port (WO)
SBBase+01h (or
ALBase+01h)
Left FM Data Port (WO)
SBBase+02h (or
ALBase+02h)
Right FM Register Address Port (WO)
SBBase+03h (or
ALBase+03h)
Right FM Data Port (WO)
SBBase+04h
Mixer Address Port (WO)
SBBase+05h
Mixer Data Port (R/W)
SBBase+06h
DAP Reset (WO)
SBBase+08h
FM Status Port (RO)
SBBase+08h
FM Register Address Port (WO)
SBBase+09h
FM Data Port (WO)
SBBase+0Ah
DAP Read Data (RO)
SBBase+0Ch
DAP Write Data/Cmd (WO)
SBBase+0Ch
DAP Write Buffer Status (RO)
SBBase+0Eh
DAP Output Buffer Status (RO)
WSBase+00h-03h
Configuration (WO)
WSBase+00h-03h
Version (RO)
WSBase+04h
Codec Index Reg (R/W, exists in Codec and shad-
owed in 82C931)
WSBase+05h
Codec Indexed Data Reg (R/W, exists in Codec only)
WSBase+06h
Codec Status Reg (R/W, exists in Codec only)
WSBase+07h
Codec Direct Data (R/W, exists in Codec only)
200h-201h
Game Port (R/W)
0F8Dh
MCBase/Password Register - Specifies:
MC Index Port Address (R/W)
MC Data Port Address (R/W)
380-383/388-38B
OPL4 (R/W)
388-38F
OPL5 (R/W)
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