MIPI* SoundWire* Interface

The SoundWire interface is an optional feature offering connection to the SoundWire devices, which include audio codecs and modem codecs. The SoundWire interface is the latest audio interface targeting (but not limited to) the phone and tablet market and the main advantage is the connection simplicity with a two wires multi-drop topology + PCM/PDM streaming capabilities. Currently SoundWire devices are non-standard across different vendors (similar to I²S / PCM audio codecs), hence it is very likely to require customized audio codec SW per vendor. These devices will be enumerated based on vendor / device ID of the SoundWire device reporting. SoundWire interface capabilities are listed as follows:

• 4 independent SoundWire Interfaces with multi-drop connections to audio peripherals
• Single audio playback at 8 ch x 96 kHz x 24 bits
• Up to 2 concurrent audio playback at 2 ch x 192 kHz x 24 bit each
• Single audio capture at 8 ch x 96 kHz x 24 bits
• Up to 4 concurrent audio capture of 2 ch x 96 kHz x 24 bit each
• Up to 4 x SoundWire interfaces frame rate synchronized on global periodic events
• Up to 6 x PCM bidirectional streams per SoundWire interface
  • Direction is programmable as either input or output stream
• 4 x PDM input streams per SoundWire interface
• Up to 2 channels per PCM streams
• Up to 1 channel per PDM streams
• Ability to map each stereo PCM streams to a sub-set of a multi-channel PCM stream DMA data transferred over Audio Link Hub
• Ability to map each mono PDM input stream to a sub-set of a multi-channel PDM stream DMA data transferred to digital mic port (decimation input)
• Supports 1.8 V I/O voltages