12.1.13 SIDâSubsystem ID Register (AudioâD31:F5).............................12-6
12.1.14 INTR_LNâInterrupt Line Register (AudioâD31:F5) .....................12-6
12.1.15 INTR_PNâInterrupt Pin Register (AudioâD31:F5) ......................12-7
12.2 ACâ97 Audio I/O Space (D31:F5)................................................................12-7
12.2.1 x_BDBARâBuffer Descriptor Base Address Register ................12-10
12.2.2 x_CIVâCurrent Index Value Register .........................................12-10
12.2.3 x_LVIâLast Valid Index Register ................................................12-10
12.2.4 x_SRâStatus Register ................................................................12-11
12.2.5 x_PICBâPosition In Current Buffer Register ..............................12-12
12.2.6 x_PIVâPrefetched Index Value Register ....................................12-12
12.2.7 x_CRâControl Register ..............................................................12-13
12.2.8 GLOB_CNTâGlobal Control Register.........................................12-14
12.2.9 GLOB_STAâGlobal Status Register ..........................................12-14
12.2.10 CASâCodec Access Semaphore Register .................................12-16
13
AC â97 Modem Controller Registers (D31:F6) .........................................................13-1
13.1 AC â97 Modem PCI Configuration Space (D31:F6) ....................................13-1
13.1.1 VIDâVendor Identification Register (ModemâD31:F6) ...............13-2
13.1.2 DIDâDevice Identification Register (ModemâD31:F6) ................13-2
13.1.3 PCICMDâPCI Command Register (ModemâD31:F6) ................13-2
13.1.4 PCISTAâDevice Status Register (ModemâD31:F6) ...................13-3
13.1.5 RIDâRevision Identification Register (ModemâD31:F6) .............13-3
13.1.6 PIâProgramming Interface Register (ModemâD31:F6) ..............13-3
13.1.7 SCCâSub Class Code Register (ModemâD31:F6).....................13-4
13.1.8 BCCâBase Class Code Register (ModemâD31:F6) ...................13-4
13.1.9 HEDTYPâHeader Type Register (ModemâD31:F6) ...................13-4
13.1.10 MMBARâModem Mixer Base Address Register
(ModemâD31:F6) .........................................................................13-5
13.1.11 MBARâModem Base Address Register (ModemâD31:F6) ........13-5
13.1.12 SVIDâSubsystem Vendor ID (ModemâD31:F6) .........................13-6
13.1.13 SIDâSubsystem ID (ModemâD31:F6) ........................................13-6
13.1.14 INTR_LNâInterrupt Line Register (ModemâD31:F6) ..................13-7
13.1.15 INT_PINâInterrupt Pin (ModemâD31:F6) ...................................13-7
13.2 ACâ97 Modem I/O Space (D31:F6) .............................................................13-8
13.2.1 x_BDBARâBuffer Descriptor List Base Address Register ..........13-10
13.2.2 x_CIVâCurrent Index Value Register .........................................13-10
13.2.3 x_LVIâLast Valid Index Register ................................................13-10
13.2.4 x_SRâStatus Register ................................................................13-11
13.2.5 x_PICBâPosition In Current Buffer Register ..............................13-12
13.2.6 x_PIVâPrefetch Index Value Register ........................................13-12
13.2.7 x_CRâControl Register ..............................................................13-13
13.2.8 GLOB_CNTâGlobal Control Register.........................................13-14
13.2.9 GLOB_STAâGlobal Status Register ..........................................13-14
13.2.10 CASâCodec Access Semaphore Register .................................13-15
14
Electrical Characteristics..........................................................................................14-1
14.1 Absolute Maximum Ratings ........................................................................14-1
14.2 Thermal Characteristics ..............................................................................14-1
14.3 D.C. Characteristics ....................................................................................14-1
14.4 A.C. Characteristics ....................................................................................14-6
14.5 Timing Diagrams.......................................................................................14-16
82801AA and 82801AB Datasheet
xvii