ASAHI KASEI
[AK4101A]
BLS
C (or U,V)
C(R191)
C(L0)
C(R0) C(L1)
C(L31) C(R31) C(L32)
LRCK
SDTI
L0
L31
R31
(except I2S)
R190
L191
R191
R191
L0
L30
R30
R30
L31
SDTI
(I2S)
R0
L191
Figure 2. Audio routing mode timing (AKMODE pin = “1”)
n Block Start Timing
Normal mode
In normal mode (TRANS pin = “0”), the block start signal is an output. It goes “H” two bit cycle after the beginning of
channel 2 of frame 0 in each block, and stays “H” for the first 32 frames.
Audio routing mode (transparent mode)
In audio routing mode (transparent mode) (ANS pin = TRANS pin = “1”), the block start becomes an input. Except in
I2S mode, a block start signal sampled any time from the first positive BICK edge of the previous left channel to the
positive BICK edge preceding the transition of an LRCK indicating the left channel will result in the current left channel
being taken as the first sub frame of the current block. See Figure 3 below.
LRCK
(n-1)th channel 1
nth channel 1
(except I2S)
LRCK
(I2S)
(n-1)th channel 1
nth channel 1
BICK
(1)
Figure 3. Block start timing in audio routing mode
A block start signal arriving during “(1)” period will result in the usage of “nth channel 1” as the
first sub-frame of the block.
MS0250-E-00
2003/07
- 13 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
