Datasheet

DocID027107 Rev 6 35/202
STM32F446xC/E Functional overview
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The SPI interface can be configured to operate in TI mode for communications in master
mode and slave mode.
3.25 HDMI (high-definition multimedia interface) consumer
electronics control (CEC)
The devices embeds a HDMI-CEC controller that provides hardware support of consumer
electronics control (CEC) (Appendix supplement 1 to the HDMI standard).
This protocol provides high-level control functions between all audiovisual products in an
environment. It is specified to operate at low speeds with minimum processing and memory
overhead.
3.26 Inter-integrated sound (I
2
S)
Three standard I
2
S interfaces (multiplexed with SPI1, SPI2 and SPI3) are available. They
can be operated in master or slave mode, in simplex communication modes, and can be
configured to operate with a 16-/32-bit resolution as an input or output channel. Audio
sampling frequencies from 8
kHz up to 192 kHz are supported. When either or both of the
I
2
S interfaces is/are configured in master mode, the master clock can be output to the
external DAC/CODEC at 256 times the sampling frequency.
All I2Sx can be served by the DMA controller.
3.27 SPDIF-RX Receiver Interface (SPDIFRX)
The SPDIF-RX peripheral, is designed to receive an S/PDIF flow compliant with IEC-60958
and IEC-61937. These standards support simple stereo streams up to high sample rate,
and compressed multi-channel surround sound, such as those defined by Dolby or DTS (up
to 5.1).
The main features of the SPDIF-RX are the following:
• Up to 4 inputs available
• Automatic symbol rate detection
• Maximum symbol rate: 12.288 MHz
• Stereo stream from 32 to 192 kHz supported
• Supports Audio IEC-60958 and IEC-61937, consumer applications
• Parity bit management
• Communication using DMA for audio samples
• Communication using DMA for control and user channel information
• Interrupt capabilities
The SPDIF-RX receiver provides all the necessary features to detect the symbol rate, and
decode the incoming data stream.
The user can select the wanted SPDIF input, and when a valid signal will be available, the
SPDIF-RX will re-sample the incoming signal, decode the Manchester stream, recognize
frames, sub-frames and blocks elements. It delivers to the CPU decoded data, and
associated status flags.
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