Datasheet

DocID030538 Rev 3 43/226
STM32H743xI Functional overview
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3.37 Management Data Input/Output (MDIO) slaves
The devices embed an MDIO slave interface it includes the following features:
• 32
MDIO Registers addresses, each of which is managed using separate input and
output data registers:
– 32 x 16-bit firmware read/write, MDIO read-only output data registers
– 32 x 16-bit firmware read-only, MDIO write-only input data registers
• Configurable slave (port) address
• Independently maskable interrupts/events:
– MDIO Register write
– MDIO Register read
– MDIO protocol error
• Able to operate in and wake up from STOP mode
3.38 SD/SDIO/MMC card host interfaces (SDMMC)
Two SDMMC host interfaces are available. They support MultiMediaCard System
Specification Version 4.51 in three different databus modes: 1 bit (default), 4 bits and 8 bits.
Both interfaces support the SD
memory card specifications version 4.1. and the SDIO card
specification version 4.0. in two different databus modes: 1 bit (default) and 4 bits.
Each SDMMC host interface supports only one SD/SDIO/MMC card at any one time and a
stack o
f MMC Version 4.51 or previous.
The SDMMC host interface embeds a dedica
ted DMA controller allowing high-speed
transfers between the interface and the SRAM.
3.39 Controller area network (FDCAN1, FDCAN2)
The controller area network (CAN) subsystem consists of two CAN modules, a shared
message RAM memory and a clock calibration unit.
Both CAN modules (FDCAN1 and FDCAN2) are comp
liant with ISO 11898-1 (CAN protocol
specification version 2.0 part A, B) and CAN FD protocol specification version 1.0.
FDCAN1 supports time triggered CA
N (TTCAN) specified in ISO 11898-4, including event
synchronized time-triggered communication, global system time, and clock drift
compensation. The FDCAN1 contains additional registers, specific to the time triggered
feature. The CAN FD option can be used together with event-triggered and time-triggered
CAN communication.
A 10 Kbytes message RAM memory implements filters,
receive FIFOs, receive buffers,
transmit event FIFOs, transmit buffers (and triggers for TTCAN). This message RAM is
shared between the two FDCAN1 and FDCAN2 modules.
The common clock calibration unit is optional. It
can be used to generate a calibrated clock
for both FDCAN1 and FDCAN2 from the HSI internal RC oscillator and the PLL, by
evaluating CAN messages received by the FDCAN1.
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