[ASAHI KASEI]
[AK4541]
Slot
0
1
2
3
4
5
6
7
8
9
10
11
12
SYNC
Codec ID1:Codec ID0=0:0 or 0:1
TAG Command Command PCM(dac) PCM(dac)
SDATA
OUT
All
0
All
0
All
0
All
0
All
0
All
0
All
0
All
0
Address
Codec ID1:Codec ID0=1:0
TAG Command Command
Data
Left
Right
All
0
All
0
All
0
All
0
PCM(dac) PCM(dac)
Left
All
0
All
0
All
0
All
0
Address Data
Right
Codec ID1:Codec ID0=1:1
TAG
TAG
Command Command
All
0
All
0
All
0
PCM(dac)
Left
All
0
All
0
PCM(dac)
Right
All
0
All
0
All
0
Address
Data
SDATA
IN
Status
Address
Status
Data
PCM(adc) PCM(adc)
Left Right
All
0
All
0
All
0
All
0
All
0
All
0
All
0
All
0
Tag Phase
Data Phase
48kHz
AC-link protocol identifies 13slots of data per frame. The frequency of sync is fixed to 48kHz. Only Slot 0, which is
the Tag phase, is 16bits, all other slots are 20bits in length. These slots are explained in later sections.
AC-link Audio Output Frame (SDATA_OUT)
a)Slot 0
Primary codec (Codec ID1 : Codec ID0 = 0 : 0)
SYNC
BIT_CLK
Valid
Frame
Slot7 Slot8 Slot9 Slot10
Slot12
Bit3
Slot11
Bit7 Bit6 Bit5 Bit4
0
Slot1 Slot2 Slot3 Slot4 Slot5 Slot6
SDATA_OUT
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Bit2
0
Bit1
0
Bit0
0
0 0
1/0 1/0 1/0 1/0 1/0 0
Slot 0
0 0
0 0
Slot 1
1 BIT_CLK delay
Secondary codec (Codec ID1 : Codec ID0 ≠ 0 : 0)
SYNC
BIT_CLK
Valid
Frame
Slot7 Slot8 Slot9 Slot10
Slot12
Bit3
Slot11
Bit4
Slot1 Slot2 Slot3 Slot4 Slot5 Slot6
SDATA_OUT
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10
Bit8
Bit7 Bit6
Bit2
0
Bit1
Bit0
Bit9
Bit5
0
0 0
1/0 1/0
1/0 0
0 1/0 1/0 0
Slot 0
1/0 1/0 1/0 1/0
Slot 1
1 BIT_CLK delay
The AK4541 checks bit15 (valid frame bit). Note that when the valid frame bit is 1, at least one bit14-6 (slot 1-
9) or bit1-0 must be valid, bit5-2 will be 0and should be ignored.
If bit15 is 0, the AK4541 ignores all following information in the frame.
The AK4541 then checks the validity of each bit in the TAG phase (slot 0).
If each bit is 0, the AK4541 ignores the slot indicated by 0. On the other hand, if each bit is 1, the slot is valid.
All bits in slot10-12(bit5-3) are 0 and bit2 is also 0.
The AK4541 monitors bit1 and 0, which are codec ID configuration bits used in multiple codec implementations.
These bits are used to identify which codec the frame data is issued to.
- 12 -
<M0047-E-01>
1999/01
AKM [ ASAHI KASEI MICROSYSTEMS ]
