I2S Specifications

One I2S port is provided by the J7 board-to-board connector interface.

See also: Audio Interface in the Expansion Board Design Guide, and I2S Interface in the Expansion Board Hardware Datasheet.

I2S Available Formats

The I2S formats listed below have not been verified and are subject to change.

Notes:
All Bits/Sample in the following tables are 16,24. Right justified is not supported.

Priority 1

Mode Frame-rate Number of slots Frame to data offset Frame polarity Frame width Frame rate inaccuracy Notes
I2S master 192K,96K, 48K, 16K, 8K 2 1 0-left,
1-right
50/50 0% Standard I2S protocol. 50% duty
PCM slave -SFS 192K,96K, 48K, 44.1K, 16K, 8K 192kHz: 2
96 kHz: 4
All else: 1 to 6
0 High      
PCM slave - LFS 192K, 96K, 48K, 44.1K, 16K,8K 192 kHz: 2 96 kHz: 4 All else: 1 to 6 0 High   0%  
PCM master -SFS 192K, 96K, 48K, 16K, 8K 192 kHz: 2
All else: 1 to 4
0 High 1 bit clock wide 0% Rising edge frame sensitive. Design supports more frame- to-data offset options.
PCM master - LFS 192K, 96K, 48K, 16K, 8K 92 kHz: 2
All else: 1 to 4
0 High 1-bit to n-bit clocks 0% Design supports width > 1 slot.

Priority 2

Mode Frame-rate Number of slots Frame to data offset Frame polarity Frame width Frame rate inaccuracy Notes
Left justified master 192K,96K, 48K 2 0 0-left,
1-right
50/50 0% Design supports flipping polarity on the frame signal.

Priority 3

Mode Frame-rate Number of slots Frame to data offset Frame polarity Frame width Frame rate inaccuracy Notes
I2S slave 192K,96K, 48K,44.1K 2 0 0-left,
1-right
50/50 0%  
Left justified slave 192K,96K, 48K 2 0 0-left,
1-right
50/50 0%  

Digital microphone ports

The Intel® Joule™ module supports microphones that use the PDM digital microphone standard and attached to the module through the AVS_M interface. Two microphones can share one data line by using time domain multiplexing to the two slots.

PDM microphones are enabled and disabled by the clock signal. Absence of clock signal will switch microphone to sleep mode, which can be utilized in system power management.

Additionally the microphones can be power-gated to cut the power consumption to zero when microphones are not used.

 

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