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8 Programmer’s Reference Manual
Contents
2.1.8 BCC—Base Class Code Register (Audio—D30:F2) .............................................67
2.1.9 HEADTYP—Header Type Register (Audio—D30:F2)...........................................68
2.1.10 NAMBAR—Native Audio Mixer Base Address Register
(Audio—D30:F2)....................................................................................................68
2.1.11 NABMBAR—Native Audio Bus Mastering Base Address
Register (Audio—D30:F2) .....................................................................................69
2.1.12 MMBAR—Mixer Base Address Register (Audio—D30:F2) ...................................69
2.1.13 MBBAR—Bus Master Base Address Register
(Audio—D30:F2)....................................................................................................70
2.1.14 SVID—Subsystem Vendor Identification Register
(Audio—D30:F2)....................................................................................................70
2.1.15 SID—Subsystem Identification Register (Audio—D30:F2)....................................71
2.1.16 CAP_PTR—Capabilities Pointer Register (Audio—D30:F2) .................................71
2.1.17 INT_LN—Interrupt Line Register (Audio—D30:F2) ...............................................71
2.1.18 INT_PN—Interrupt Pin Register (Audio—D30:F2) ................................................72
2.1.19 PCID—Programmable Codec Identification Register
(Audio—D30:F2)....................................................................................................72
2.1.20 CFG—Configuration Register (Audio—D30:F2)....................................................72
2.1.21 PID—PCI Power Management Capability Identification
Register (Audio—D30:F2) .....................................................................................73
2.1.22 PC—Power Management Capabilities Register
(Audio—D30:F2)....................................................................................................73
2.1.23 PCS—Power Management Control and Status Register
(Audio—D30:F2)....................................................................................................74
2.2 AC ’97 Audio I/O Space (D30:F2).......................................................................................75
2.2.1 x_BDBAR—Buffer Descriptor Base Address Register
(Audio—D30:F2)....................................................................................................78
2.2.2 x_CIV—Current Index Value Register (Audio—D30:F2).......................................79
2.2.3 x_LVI—Last Valid Index Register (Audio—D30:F2)..............................................79
2.2.4 x_SR—Status Register (Audio—D30:F2)..............................................................80
2.2.5 x_PICB—Position In Current Buffer Register
(Audio—D30:F2)....................................................................................................81
2.2.6 x_PIV—Prefetched Index Value Register (Audio—D30:F2)..................................81
2.2.7 x_CR—Control Register (Audio—D30:F2) ............................................................82
2.2.8 GLOB_CNT—Global Control Register (Audio—D30:F2) ......................................83
2.2.9 GLOB_STA—Global Status Register (Audio—D30:F2) ........................................85
2.2.10 CAS—Codec Access Semaphore Register (Audio—D30:F2)...............................87
2.2.11 SDM—SDATA_IN Map Register (Audio—D30:F2) ...............................................87
3 AC ’97 Modem Controller Registers (D30:F3)...........................................................................89
3.1 AC ’97 Modem PCI Configuration Space (D30:F3) ............................................................89
3.1.1 VID—Vendor Identification Register (Modem—D30:F3) .......................................90
3.1.2 DID—Device Identification Register (Modem—D30:F3)........................................90
3.1.3 PCICMD—PCI Command Register (Modem—D30:F3) ........................................90
3.1.4 PCISTS—PCI Status Register (Modem—D30:F3)................................................91
3.1.5 RID—Revision Identification Register (Modem—D30:F3).....................................92
3.1.6 PI—Programming Interface Register (Modem—D30:F3)......................................92
3.1.7 SCC—Sub Class Code Register (Modem—D30:F3) ............................................92
3.1.8 BCC—Base Class Code Register (Modem—D30:F3)...........................................92
3.1.9 HEADTYP—Header Type Register (Modem—D30:F3) ........................................93
3.1.10 MMBAR—Modem Mixer Base Address Register