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Interface enables PCM, PDM audio data connectivity

10 Oct 2014

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Cadence Design Systems, Inc. released a digital audio interface specification that enables bi-directional digital communication with a focus on low complexity and low gate count for mobile design applications.

The SoundWire Controller IP claims to be the industry's first MIPI specification. The specification defines direct interfacing with digital microphones or speakers into mobile SoC designs, with a simpler audio frame format and a straightforward command-based register-programming interface for low-cost audio peripherals.

Soundwire Controller IP

SoundWire master controller IP system-level diagram. Source: Cadence

As shown in the diagram, SoundWire interface is utilised to provide two representative types of

connectivity. The first type carries PCM audio data between a mobile application processor and a stand-alone audio codec or Bluetooth/FM radio controller. The second type carries PDM audio data between the audio codec and MEMS microphone or speaker amplifiers.

The Cadence MIPI SoundWire Master Controller IP uses a modular and layered design approach. Configurable parameters are provided to customise client interface, FIFO width/depth, port count, lane count, clocking scheme for area- and power-optimised solution.

The SoundWire Controller IP is now available for early access partners, with general availability currently scheduled for the fourth quarter of 2014.

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