STM32G474CB datasheet(44/236 Pages) STMICROELECTRONICS

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Functional overview

STM32G474xB STM32G474xC STM32G474xE

44/236

DS12288 Rev 4

3.32

Serial audio interfaces (SAI)

The device embeds 1 SAI. The SAI bus interface handles communications between the

microcontroller and the serial audio protocol.

SAI peripheral supports:

•

Two independent audio sub-blocks which can be transmitters or receivers with their

respective FIFO.

•

8-word integrated FIFOs for each audio sub-block.

•

Synchronous or asynchronous mode between the audio sub-blocks.

•

Master or slave configuration independent for both audio sub-blocks.

•

Clock generator for each audio block to target independent audio frequency sampling

when both audio sub-blocks are configured in master mode.

•

Data size configurable: 8-, 10-, 16-, 20-, 24-, 32-bit.

•

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 and SPDIF

out.

•

Up to 16 slots available with configurable size and with the possibility to select which

ones are active in the audio frame.

•

Number of bits by frame may 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.

•

Interruption sources when enabled:

–

Errors.

–

FIFO requests.

•

DMA interface with 2 dedicated channels to handle access to the dedicated integrated

FIFO of each SAI audio sub-block.

Table 10. SAI implementation for the features implementation

SAI features

Support(1)

I2S, LSB or MSB-justified, PCM/DSP, TDM, AC’97

Mute mode

Stereo/Mono audio frame capability

16 slots

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