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Hardware Integration Guide
Figure 21.
PCM_FS Timing Diagram (128 kHz Clock)
Figure 22.
PCM Codec to AR Device Timing Diagram (Auxiliary PCM)
Figure 23.
AR Device to PCM Codec Timing Diagram (Auxiliary PCM)
6.15.2.2.
I2S
The AirPrime AR7558 I2S interface can be used to transfer serial digital audio to/from an external
stereo DAC/ADC. The I2S interface is a 4-wire interface: serial clock (I2S_SCLK), word select
(I2S_WS), serial uplink data (I2S_DIN), and serial downlink data (I2S_DOUT).
The AirPrime AR7558 I2S interface can be configured as a master or slave and either transmitter or
receiver.
A high-level timing diagram of the I2S signals is presented below.
4116922
Rev 1.1
Baseband Specification
January 21, 2015
45
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