ad1881a Analog Devices, Inc., ad1881a Datasheet - Page 17

• Manufacturer Part Number: ad1881a
• Description: Ac?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

Subsection Ready Register (Index 26h)
Note: The ready bits are read only, writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the
AD1881A subsections. If the bit is a one, then that subsection is “ready.” Ready is defined as the subsection able to perform in its
nominal state.
ADC
DAC
ANL
REF
PR[5:0]
EAPD
Extended Audio ID Register (Index 28h)
Note: The Extended Audio ID is a read only register.
VRA
ID[1:0]
R g
R g
R g
R g
R
N m
N m
N m
N m
N
6 2 h
6 2 h
6 2 h
6 2 h
6 2
R g
R g
R g
R g
R
N m
N m
N m
N m
N
8 2 h
8 2 h
8 2 h
8 2 h
8 2
e
e
e
e
e
u
u
u
e
e
e
e
e
u
u
u
u
u
u
u
h
h
g
g
m
m
N
N
N
P
P
P
N
N
N
E
E
E
N
N
P
P
N
N
E
E
o
o
o
a
a
a
a
a
o
o
a
a
a
a
a
x
x
x
x
x
w
w
w
e t
e t
e t
m
m
m
m
m
w
w
m
m
m
m
m
e t
e t
e
e
e
e
e
n
n
n
n
n
e
e
e
e
e
e
e
e
e
e
- r
- r
- r
- r
- r
d
d
d
d
d
e
e
e
e
e
D
D
D
D
D
d
d
d
d
d
o
o
o
o
o
A
A
A
A
A
w
w
w
w
w
u
u
u
u
u
n
n
n
n
n
Analog gain, attenuators and mute blocks, and mixers ready.
External Audio Amp Power Down. Available when programmed as an AC’97 codec.
ID1, ID0 is a 2-bit field that indicates the codec configuration: Primary is 00; Secondary is 01, 10, or 11.
ADC section ready to transmit data.
DAC section ready to accept data.
Voltage References, VREF and VREFOUT up to nominal level.
AD1881A Power-Down Modes. The first three bits are to be used individually rather than in combination with each
other. The last bit PR3 can be used in combination with PR2 or by itself. The mixer and reference cannot be
powered down via PR3 unless the ADCs and DACs are also powered down. Nothing else can be powered up until
the reference is up.
PR5 has no effect unless all ADCs, DACs, and the AC-Link are powered down. The reference and the mixer can
either be up or down, but all power-up sequences must be allowed to run to completion before PR5 and PR4 are
both set.
In multiple-codec systems, the master codec’s PR5 and PR4 bits control the slave codec. PR5 is also effective in
the slave codec if the master’s PR5 bit is clear, but the PR4 bit has no effect except to enable or disable PR5.
Power-Down State
ADC Power-Down
DAC Power-Down
ADC and DAC Power-Down
Mixer Power-Down
ADC + Mixer Power-Down
DAC + Mixer Power-Down
ADC + DAC + Mixer Power-Down
Standby
Variable Rate Audio. VRA = 1 enables Variable Rate Audio.
d
d
d
d
d
C
C
C
C
C
o i
o i
o i
o i
o i
0 = Pin 47 set to LO state (default).
1 = Pin 47 set to HI state.
n
n
n
n
n
r t
r t
r t
I
I
I
r t
r t
I
I
D
D
D
D
D
/ l
/ l
/ l
/ l
/ l
t S
t S
t S
t S
t S
t a
t a
t a
t a
t a
D 5 1
D 5 1
D 5 1
D 5 1
D
I 1
I 1
I 1
I 1
I
D
D
D
D
D
5 1
1
D 5 1
D 5 1
D 5 1
D 5 1
D
E
E
E
E
E
A
A
A
A
A
5 1
D 4 1
D 4 1
D 4 1
D 4 1
D
I 0
I 0
I 0
I 0
I
P
P
P
P
P
D
D
D
D
D
D
D
D
D
D
4 1
0
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
D 3 1
D 3 1
D 3 1
X X X X X
D 3 1
D
4 1
3 1
D 3 1
D 3 1
D 3 1
D 3 1
D
P 5
P 5
P 5
P 5
P
R
R
R
R
R
3 1
D 2 1
D 2 1
D 2 1
D 2 1
D
X X X X X
5
2 1
D 2 1
D 2 1
D 2 1
D 2 1
D
P 4
P 4
P 4
P 4
P
R
R
R
R
R
2 1
4
D 1 1
D 1 1
D 1 1
D 1 1
D
X X X X X
1 1
D 1 1
D 1 1
D 1 1
D 1 1
D
P 3
P 3
P 3
P 3
P
R
R
R
R
R
1 1
3
D 0 1
D 0 1
D 0 1
X X X X X
D 0 1
D
0 1
D 0 1
D 0 1
D 0 1
D 0 1
D
P 2
P 2
P 2
P 2
P
R
R
R
R
R
0 1
2
D9
D9
D9
D9
D
X X X X X
D9
D9
D9
D9
D
P 1
P 1
P 1
P 1
P
9
R
R
R
R
R
9
1
D8
D8
D8
D8
D
X X X X X
D8
D8
D8
D8
D
P 0
P 0
P 0
P 0
P
8
R
R
R
R
R
8
0
D7
D7
D7
D7
D
X X X X X
PR5
0
0
0
0
0
0
0
1
D7
D7
D7
D7
D
X X X X X
7
7
D6
D6
D6
D6
D
X X X X X
D6
D6
D6
D6
D
X X X X X
6
6
PR4
0
0
0
0
0
0
0
1
D5
D5
D5
D5
D
X X X X X
D5
D5
D5
D5
D
X X X X X
5
5
PR3
0
0
0
0
0
0
0
1
D4
D4
D4
X X X X X
D4
D
D4
D4
D4
D4
D
X X X X X
4
4
D3
D3
D3
D3
D
R F
R F
R F
R F
R
D3
D3
D3
D3
D
X X X X X
E
E
E
E
E
3
PR2
0
0
0
1
1
1
1
1
3
F
D2
D2
D2
D2
D
A L
A L
A L
A L
A
D2
D2
D2
X X X X X
D2
D
N
N
N
N
N
2
2
L
PR1
0
1
1
0
0
1
1
1
D1
D1
D1
D1
D
D C
D C
D C
D C
D
D1
D1
D1
D1
D
X X X X X
1
A
A
A
A
A
1
AD1881A
C
PR0
1
0
1
0
1
0
1
1
D0
D0
D0
D0
D
V A
V A
V A
V A
V
D0
D0
D0
D0
D
A C
A C
A C
A C
A
R
R
R
R
R
0
D
D
D
D
D
0
A
C
D
D
D
0 0 h
0 0 h
0 0
D
D
D
N A
N A
N A
D
D
0 0 h
0 0
D
D
N A
N
/
/
/
/
/
e
e
e
e
e
e
e
e
e
e
0 0
0 0
0 0
0 0
0 0
A
a f
a f
a f
a f
a f
a f
a f
a f
a f
a f
h
h
u
u
u
u
u
u
u
u
u
u
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l