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Programmer’s Reference Manual 77
AC ’97 Audio Controller Registers (D30:F2)
Table 2-3. Native Audio Bus Master Control Registers (Sheet 1 of 2)
Offset Mnemonic Name Default Access
00h PI_BDBAR PCM In Buffer Descriptor list Base Address 00000000h R/W
04h PI_CIV PCM In Current Index Value 00h RO
05h PI_LVI PCM In Last Valid Index 00h R/W
06h PI_SR PCM In Status 0001h R/WC, RO
08h PI_PICB PCM In Position in Current Buffer 0000h RO
0Ah PI_PIV PCM In Prefetched Index Value 00h RO
0Bh PI_CR PCM In Control 00h R/W, R/W (special)
10h PO_BDBAR
PCM Out Buffer Descriptor list Base
Address
00000000h R/W
14h PO_CIV PCM Out Current Index Value 00h RO
15h PO_LVI PCM Out Last Valid Index 00h R/W
16h PO_SR PCM Out Status 0001h R/WC, RO
18h PO_PICB PCM In Position In Current Buffer 0000h RO
1Ah PO_PIV PCM Out Prefetched Index Value 00h RO
1Bh PO_CR PCM Out Control 00h R/W, R/W (special)
20h MC_BDBAR Mic. In Buffer Descriptor List Base Address 00000000h R/W
24h MC_CIV Mic. In Current Index Value 00h RO
25h MC_LVI Mic. In Last Valid Index 00h R/W
26h MC_SR Mic. In Status 0001h R/WC, RO
28h MC_PICB Mic. In Position In Current Buffer 0000h RO
2Ah MC_PIV Mic. In Prefetched Index Value 00h RO
2Bh MC_CR Mic. In Control 00h R/W, R/W (special)
2Ch GLOB_CNT Global Control 00000000h R/W, R/W (special)
30h GLOB_STA Global Status
See register
description
R/W, R/WC, RO
34h CAS Codec Access Semaphore 00h R/W (special)
40h MC2_BDBAR Mic. 2 Buffer Descriptor List Base Address 00000000h R/W
44h MC2_CIV Mic. 2 Current Index Value 00h RO
45h MC2_LVI Mic. 2 Last Valid Index 00h R/W
46h MC2_SR Mic. 2 Status 0001h RO, R/WC
48h MC2_PICB Mic 2 Position In Current Buffer 0000h RO
4Ah MC2_PIV Mic. 2 Prefetched Index Value 00h RO
4Bh MC2_CR Mic. 2 Control 00h R/W, R/W (special)
50h PI2_BDBAR
PCM In 2 Buffer Descriptor List Base
Address
00000000h R/W
54h PI2_CIV PCM In 2 Current Index Value 00h RO
55h PI2_LVI PCM In 2 Last Valid Index 00h R/W
56h PI2_SR PCM In 2 Status 0001h R/WC, RO