AK4544A Datasheet, PDF (23/35 Pages) Asahi Kasei Microsystems – AC97 MULTIMEDIA AUDIO CODEC WITH SRC

[ASAHI KASEI]
[AK4544A]
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# pin(46pin) and ID0# pin(45pin). ID1# pin and ID0# pin can be strapped and
adopt inverted polarity and these logic values are stored to D15 and D14 called as ID1 bit and ID0 bit. Default ID
(ID1,ID0)=(0,0) when both ID1# pin and ID0# pin are open state. Depended on codec ID configuration, the AK4544A
is assigned to Primary codec or Secondary codec. Note that codec ID configuration has to be fixed before Powering up
of the device.
Physical Connection
Pin46(ID1#) Pin45(ID0#)
NC
NC
NC
GND
GND
NC
GND
GND
Logic Value
ID1
ID0
0
0
0
1
1
0
1
1
Configuration
Primary
Secondary ID01
Secondary ID10
Secondary ID11
The AMAP bit D9 of this read only register for the AK4544A will always be set to “1” indicating that the
default(following cold or warm reset) codec slot DAC mapping(configured via hardwiring, strap pin(s), or other
methods) conform to below table.
The audio DAC mapping can be changed based on the codec ID configuration.
Codec ID AC-link Frame Data used for DACs
Comments
PCM Left DAC uses PCM Right DAC uses
data from Slot No. data from Slot No.
00
3
4
Original Definition(Master)
01
3
4
Original Definition(Docking)
10
7
8
Left/Right surround channels
11
6
9
Center/LFE channels
Since AK4544A supports variable sample rates, field of D0: VRA is set to 1, indicates Variable Rate PCM Audio is
supported.
n Extended Audio Status and Control Register (Index 2Ah)
Bits D0 to D3, and D11 to D14 are read/write controls, while D6 to D9 are read only data to controller.
Bit
Function
VRA=1
(D0)
Enables Variable Rate Audio mode in conjunction with Audio Sample Rate
Control Registers and tag-bit/SLOTREQ signaling
Because CDAC,LDAC,SDAC, and MICADC are not supported, default value at cold register reset for D11-D14 is set
to “0”.
Internal SRC related circuits are controlled by this VRA bit(2Ah), not by VRA in Extended Audio ID register(28h).
<MS0026-E-00>
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2000/04