21 / 48 page
SigmaTel, Inc.
Data Sheet
STAC9721
21
04/07/00
04/07/00
4.4 Programming Registers:
Table 7. Programming Registers
REG
#
NAME
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
DE-
FAULT
00h
Reset
X
SE4 SE3 SE2 SE1 SE0
ID9
ID8
ID7
ID6
ID5
ID4
ID3
ID2
ID1
ID0
6940h
02h
Master Volume
Mute
X
X
ML4 ML3 ML2 ML1 ML0
X
X
X
MR4 MR3 MR2 MR1 MR0
8000h
04h
LNLVL Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8000h
06h
Master Volume Mono
Mute
X
X
X
X
X
X
X
X
X
X
MM4 MM3 MM2 MM1 MM0
8000h
0Ah
PC_BEEP Volume
Mute
X
X
X
X
X
X
X
X
X
X
PV3 PV2 PV1 PV0
X
0000h
0Ch
Phone Volume
Mute
X
X
X
X
X
X
X
X
X
X
GN4 GN3 GN2 GN1 GN0
8008h
0Eh
Mic Volume
Mute
X
X
X
X
X
X
X
X
20dB
X
GN4 GN3 GN2 GN1 GN0
8008h
10h
Line In Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8808h
12h
CD Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8808h
14h
Video Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8808h
16h
AUX Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8808h
18h
PCM Out Volume
Mute
X
X
GL4 GL3 GL2 GL1 GL0
X
X
X
GR4 GR3 GR2 GR1 GR0
8808h
1Ah
Record Select
X
X
X
X
X
SL2
SL1
SL0
X
X
X
X
X
SR2 SR1 SR0
0000h
1Ch
Record Gain
Mute
X
X
X
GL3 GL2 GL1 GL0
X
X
X
X
GR3 GR2 GR1 GR0
8000h
20h
General Purpose
X
X
3D
X
X
X
MIX
MS LPBK
X
X
X
X
X
X
X
0000h
22h
3D Control
X
X
X
X
X
X
X
X
X
X
X
X
DP3 DP2
X
X
0000h
26h
Powerdown Ctrl/Stat
EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0
X
X
X
X
REF ANL DAC ADC
000Fh
28h
Extended Audio ID
ID1
ID0
X
X
X
X
AMAP
X
X
X
X
X
X
X
X
X
0200h
6Ch
Revision Code
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0000h
6Eh
Analog Special
X
X
X
X
X
X
X
X
X
X
X
X
X
X
DAC
-6dB
ADC
-6dB
0000h
70h
72h Enable
EN15 EN14 EN13 EN12 EN11 EN10 EN9 EN8 EN7 EN6 EN5 EN4 EN3 EN2 EN1 EN0
0000h
72h
Analog Current Adjust
X
X
X
X
X
X
X
X
X
X
X
X
X
Bias1 Bias0
X
0000h
74h
Multi-Channel Selection
X
X
X
X
X
X
X
X
X
X
X
X
X
X
MC1 MC0
0000h
76h
78h Enable
EN15 EN14 EN13 EN12 EN11 EN10 EN9 EN8 EN7 EN6 EN5 EN4 EN3 EN2 EN1 EN0
0000h
78h
Clock Access
X
X
ALT
CLK
PWD
CL2x
CLK
INV
X
X
X
X
X
X
X
X
X
OSC
PWD
X
0000h
7Ch
Vendor ID1
1
0
0
0
0
0
1
1
1
0
0
0
0
1
0
0
8384h
7Eh
Vendor ID2
0
1
1
1
0
1
1
0
0
0
0
0
1
0
0
1
7609h
Notes:
1.
All registers not shown and bits containing an X are reserved.
2.
Any reserved bits, marked X, are not writable, and read back as zeros.
3.
PC_BEEP default to 0000h, un-muted.
4.
If optional bits D13, D5 of register 02h or D5 of register 06h are set to 1, then the corresponding attenuation is set to 46dB and the register
reads will produce 1Fh as a value for this attenuation/gain block.
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