ORCA SOM/ORCA Hardware/Peripherals/Audio

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Issue Date Notes
2021/02/03 First release

Peripheral Audio[edit | edit source]

The Audio interface available on ORCA SoM is based on iMX8MPlus SoC which provides the following audio subsystems:

  • Synchronous Audio Interface (SAI)
    • 6x I2S/SAI
  • Sony/Philips Digital Interface (SPDIF)
  • PDM microphone interface
  • eARC

Description[edit | edit source]

The I2S module provides a synchronous audio interface (SAI) that supports full-duplex serial interfaces with frame synchronization such as I2S, AC97, TDM, and codec/DSP interfaces. It supports the following standards and features:

  • Transmitter and receiver with independent bit clock and frame sync supporting 8 data lines
  • Receiver with independent bit clock and frame sync supporting 8 data lines
  • Each data line can support a maximum Frame size of 32 words
  • Asynchronous 128 x 32-bit FIFO for each transmit and receive data line
  • Supports packing of 8-bit and 16-bit data into each 32-bit FIFO word
  • Supports combining multiple data line FIFOs into single data line FIFO
  • Independent 32-bit timestamp counters and bit counters for monitoring transmit and receive progress

The Sony/Philips Digital Interface (SPDIF) audio block is a stereo transceiver that allows the processor to receive and transmit digital audio.

The PDM Microphone Interface (MICFIL) includes the following features:

  • Decimation filters:
    • Fixed filtering characteristics for audio application.
    • 24-bit signed filter output.
    • Maximum dynamic range: 120dB.
    • Internal clock divider for a programmable PDM clock generation.
    • Full or partial set of channels operation with individual enable control.
    • Programmable decimation rate.
    • Programmable DC remover.
    • Range adjustement capability.
    • FIFOs with interrupt and DMA capability.
    • Each FIFO with 32 entries length.
  • Hardware Voice Activity Detector (HWVAD).
    • Interrupt capability.
    • Zero-Crossing Detection (ZCD) option.

The enhanced audio return channel (eARC) provides an advanced audio stream through the HDMI interface.

The asyncronous sample rate converter (ASRC) is a digital module that converts audio from a source sample rate to a destination sample rate.

The primary features for the ASRC are as follows:

  • 4 Contexts - groups of channels with an independent time base
  • Fully independent and concurrent context control
  • Simultaneous processing of up to 32 audio channels
  • Programmable filter charachteristics for each context
  • 32, 24, 20, and 16-bit fixed point audio sample support
  • 32-bit floating point audio sample support
  • 8kHz to 384 kHz sample rate
  • 1/16 to 8x sample rate conversion ratio
  • Software control of fine conversion ratio

Pin mapping[edit | edit source]

The Pin mapping is described in the Pinout table section