82801BA Datasheet, PDF (403/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

AC’97 Audio Controller Registers (D31:F5)
Table 13-3. Native Audio Bus Master Control Registers
Offset
00h
04h
05h
06h
08h
0Ah
0Bh
10h
14h
15h
16h
18h
1Ah
1Bh
20h
24h
25h
26h
28h
2Ah
2Bh
2Ch
30h
34h
Mnemonic
Name
PI_BDBAR
PI_CIV
PI_LVI
PI_SR
PI_PICB
PI_PIV
PI_CR
PO_BDBAR
PO_CIV
PO_LVI
PO_SR
PO_PICB
PO_PIV
PO_CR
MC_BDBAR
PM_CIV
MC_LVI
MC_SR
MC_PICB
MC_PIV
MC_CR
GLOB_CNT
GLOB_STA
ACC_SEMA
PCM In Buffer Descriptor list Base Address Register
PCM In Current Index Value
PCM In Last Valid Index
PCM In Status Register
PCM In Position In Current Buffer
PCM In Prefetched Index Value
PCM In Control Register
PCM Out Buffer Descriptor list Base Address Register
PCM Out Current Index Value
PCM Out Last Valid Index
PCM Out Status Register
PCM Out Position In Current Buffer
PCM Out Prefetched Index Value
PCM Out Control Register
Mic. In Buffer Descriptor list Base Address Register
Mic. In Current Index Value
Mic. In Last Valid Index
Mic. In Status Register
Mic In Position In Current Buffer
Mic. In Prefetched Index Value
Mic. In Control Register
Global Control
Global Status
Codec Write Semaphore Register
Default
00000000h
00h
00h
0001h
0000h
00h
00h
00000000h
00h
00h
0001h
0000h
00h
00h
00000000h
00h
00h
0001h
0000h
00h
00h
00000000h
00000000h
00h
Access
R/W
RO
R/W
R/W
RO
RO
R/W
R/W
RO
R/W
R/W
RO
RO
R/W
R/W
RO
R/W
R/W
RO
RO
R/W
R/W
RO
R/W
13.2.1
x_BDBAR—Buffer Descriptor Base Address Register
I/O Address:
Default Value:
Lockable:
NABMBAR + 00h (PIBDBAR), Attribute:
NABMBAR + 10h (POBDBAR),
NABMBAR + 20h (MCBDBAR)
00000000h
Size:
No
Power Well:
This register can be accessed only as a DWord (32 bits).
R/W (DWord access only)
32 bits
Core
Bit
Description
Buffer Descriptor Base Address[31:3]—R/W. These bits represent address bits 31:3. The data
31:3 should be aligned on 8 byte boundaries. Each buffer descriptor is 8 bytes long and the list can
contain a maximum of 32 entries.
2:0 Hardwired to 0.
82801BA ICH2 and 82801BAM ICH2-M Datasheet
13-9