RM0440 Rev 4 1793/2126
RM0440 Serial audio interface (SAI)
1858
40.2 SAI main features
• Two independent audio subblocks which can be transmitters or receivers with their
respective FIFO.
• 8-word integrated FIFOs for each audio subblock.
• Synchronous or asynchronous mode between the audio subblocks.
• Master or slave configuration independent for both audio subblocks.
• Clock generator for each audio block to target independent audio frequency sampling
when both audio subblocks are configured in master mode.
• Data size configurable: 8-, 10-, 16-, 20-, 24-, 32-bit.
• Audio protocol: I2S, LSB or MSB-justified, PCM/DSP, TDM, AC’97
• PDM interface, supporting up to 4 microphone pairs
• SPDIF output available if required.
• Up to 16 slots available with configurable size.
• Number of bits by frame can be configurable.
• Frame synchronization active level configurable (offset, bit length, level).
• First active bit position in the slot is configurable.
• LSB first or MSB first for data transfer.
• Mute mode.
• Stereo/Mono audio frame capability.
• Communication clock strobing edge configurable (SCK).
• Error flags with associated interrupts if enabled respectively.
– Overrun and underrun detection,
– Anticipated frame synchronization signal detection in slave mode,
– Late frame synchronization signal detection in slave mode,
– Codec not ready for the AC’97 mode in reception.
• Interrupt sources when enabled:
–Errors,
– FIFO requests.
• 2-channel DMA interface.
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