This paper presents the key features of the upcoming SoundWire hardware interface and protocol. SoundWire is a robust, scalable, low complexity, low power, low latency, two-pin (clock and data) multi-drop bus that allows for the transfer of multiple audio streams and embedded control/commands. SoundWire provides synchronization capabilities and supports both PCM and PDM, multichannel data, isochronous and asynchronous modes. The development of this interface has generated a lot of interest and contributions from providers of audio peripherals (microphones, amplifiers & audio codecs), silicon vendors and OEMs. It will become a ratified standard by MIPI (Mobile Industry Processor Interface consortium) at the end of 2014. The first products should appear in 2015 and enable new usage models or design choices for audio applications.
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