Serial audio interface (SAI)
RM0090
DocID018909 Rev 11
29.2 Main
features
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Two independent audio sub-blocks which can be transmitters or receivers with their
respective FIFO.
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8-word integrated FIFOs for each audio sub-block.
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Synchronous or asynchronous mode between the audio sub-blocks.
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Master or slave configuration independent for both audio sub-blocks.
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Clock generator for each audio block to target independent audio frequency sampling
when both audio sub-blocks are configured in master mode.
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Data size configurable: 8-, 10-, 16-, 20-, 24-, 32-bit.
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Peripheral with large configurability and flexibility allowing to target as example the
following audio protocol: I2S, LSB or MSB-justified, PCM/DSP, TDM, AC’97
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Up to 16 slots available with configurable size and with the possibility to select which
ones are active in the audio frame.
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Number of bits by frame may be configurable.
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Frame synchronization active level configurable (offset, bit length, level).
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First active bit position in the slot is configurable.
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LSB first or MSB first for data transfer.
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Mute mode.
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Stereo/Mono audio frame capability.
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Communication clock strobing edge configurable (SCK).
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Error flags with associated interrupts if enabled respectively.
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Overrun and underrun detection,
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Anticipated frame synchronization signal detection in slave mode,
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Late frame synchronization signal detection in slave mode,
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Codec not ready for the AC’97 mode in reception.
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Interruption sources when enabled:
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Errors,
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FIFO requests.
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DMA interface with 2 dedicated channels to handle access to the dedicated integrated
FIFO of each SAI audio sub-block.
