AK4543 Datasheet, PDF (20/31 Pages) Asahi Kasei Microsystems – AC’97 Rev 2.1 Multimedia Audio CODEC

[ASAHI KASEI]
[AK4543]
n Powerdown Control/Status Register (Index 26h )
BitsD0 to D3 are read only status bits. Any write to these bits will not affect the operation of the AK4543. These
bits are used as status bits to subsections of the AC ’97 codec. A “1” indicates the subsection of the AK4543 is
“ready” or that is capable of performing in normal operation.
Bit
REF D3
ANL D2
DAC D1
ADC D0
Function
Vref up to nominal state
0=NOT ready, 1=ready,
Analog mixers, etc ready
0=NOT ready, 1=ready
DAC section ready to accept data
0=NOT ready, 1=ready
ADC section ready to transmit data
0=NOT ready, 1=ready
The power down modes are as follows.
Bit
PR0
D8
PR1
D9
PR2 D10
PR3 D11
PR4 D12
PR5
D13
PR6
D14
PR7
D15
Function
PCM in ADC’s & Input Mux Powerdown
PCM out DACs Powerdown
Analog Mixer Powerdown (Vref still on)
Analog Mixer Powerdown (Vref off)
Digital Interface (AC-link) Powerdown
Internal Clk disable
True Line Level Out Powerdown
EAPD(External Amplifier Powerdown)
When PR3 is set to “1”, the ADC, DAC, Mixer, True Line Level Out, and VREF are powered down even if any PRx
bit are “0”. When PR3 bit is reset to “0”, the AK4543 resumes the previous state by referencing previous PRx bit. In
this case, the AK4543 outputs corresponding slot-x valid bits in the slot 0 as “0” until the AK4543 results in normal
operation(Codec Ready) .
EAPD(External Amplifier Power Down) bit controls an external audio amplifier. EAPD=”0” places a “0”(L) on the
output pin, enabling an external audio amplifier, EAPD= ”1”(H) shuts it down. Powered up default is
EAPD=”0”(external audio amplifier enabled).
n Extended Audio ID(Index 28h)
The Extended Audio ID(28h) is a read only register. 2bits D15&D14 can be read for codec identification. D15 ,14
are automatically set with the codec ID1#(46pin) and ID0#(45pin). ID1# and ID0# can be strapped and adopt
inverted polarity and default to 00= Primary(via internal pull up) when left floating. Depended on codec ID
configuration, the AK4543 is assigned to Primary codec or Secondary codec. Note that codec ID configuration has to
be fixed before Powering up of the device.
ID1#(pin 46)
Physical
Logic
Connection
Value
NC
0
NC
0
GND
1
GND
1
ID0#(pin45)
Physical
Logic
Connection
Value
NC
0
GND
1
NC
0
GND
1
Configuration
(Codec ID)
Primary ID00
Secondary ID01
Secondary ID10
Secondary ID11
The AMAP (bit D9 of this read only register) will always be set to “1” indicating that DAC input slot will follow to
AC’97 recommendation as shown in next table.(CODEC ID is configured via ID1#m ID0# pins)
The audio DAC mapping can be changed based on the codec ID configuration.
Codec ID
00
01
10
11
AC-link Frame Data used for DACs
PCM Left DAC uses PCM Right DAC
data from Slot#
uses data from Slot#
3
4
3
4
7
8
6
9
Comments
Expected use
Original Definition(Master)
Original Definition(Docking)
Left/Right surround channels
Center/LFE channels
<M0046-E-01>
- 20 -
1999/01