Rainbow Electronics W90N745CDG - Manual (Page 237)

W90N745CD/W90N745CDG
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The 16 bits I²S and MSB-justified format are support, the timing diagram is shown as Figure 6.9.2
L R C L K
B C K
D A T A
L e f t R ig h t
1 2 3
M S B B 2
1 2
L S B M S B
I 2 S b u s
L R C L K
B C K
D A T A
L e f t R ig h t
1 2 3
B 2 B 3
1 2
M S B B 2
M S B – J u s t if ie d f o r m a t
M S B L S B
Figure 6.9.2 The format of I²S
The sampling rate, bit shift clock frequency could be set by the control register ACTL_I²SCON.
6.9.2 AC97 Interface
The AC97 interface, called AC-link is supported. For input and output direction, each frame contains a
Tag slot and 12 data slots. However, in the 12 data slots, only 4 slots are used in W90N745, other 8
slots are not supported, and the control data and audio data are transferred in the 4 valid slots. Each
slot contains 20 bits data.
The interface signals are shown as Figure 6.9.3
Figure 6.9.3 The interface signal of AC-link
Audio
Controller
Audio
Codec
SYNC
BCLK
DIN
DOUT
RESETB