ESP32 datasheet(32/60 Pages) ESPRESSIF

32 / 60 page

4. Peripherals and Sensors

• Tagged MAC frame (VLAN support)

• Half-duplex (CSMA/CD) and full-duplex operation

• MAC control sublayer (control frames)

• 32-bit CRC generation and removal

• Several address-filtering modes for physical and multicast address (multicast and group addresses)

• 32-bit status code for each transmitted or received frame

• Internal FIFOs to buffer transmit and receive frames. The transmit FIFO and the receive FIFO are both 512

words (32-bit)

• Hardware PTP (Precision Time Protocol) in accordance with IEEE 1588 2008 (PTP V2)

• 25 MHz/50 MHz clock output

4.1.8 SD/SDIO/MMC Host Controller

An SD/SDIO/MMC host controller is available on ESP32, which supports the following features:

• Secure Digital memory (SD mem Version 3.0 and Version 3.01)

• Secure Digital I/O (SDIO Version 3.0)

• Consumer Electronics Advanced Transport Architecture (CE-ATA Version 1.1)

• Multimedia Cards (MMC Version 4.41, eMMC Version 4.5 and Version 4.51)

The controller allows up to 80 MHz of clock output in three different data-bus modes: 1-bit, 4-bit and 8-bit. It

supports two SD/SDIO/MMC4.41 cards in a 4-bit data-bus mode. It also supports one SD card operating at

1.8V.

4.1.9 SDIO/SPI Slave Controller

ESP32 integrates an SD device interface that conforms to the industry-standard SDIO Card Specification Version

2.0, and allows a host controller to access the SoC, using the SDIO bus interface and protocol. ESP32 acts as the

slave on the SDIO bus. The host can access the SDIO-interface registers directly and can access shared memory

via a DMA engine, thus maximizing performance without engaging the processor cores.

The SDIO/SPI slave controller supports the following features:

• SPI, 1-bit SDIO, and 4-bit SDIO transfer modes over the full clock range from 0 to 50 MHz

• Configurable sampling and driving clock edge

• Special registers for direct access by host

• Interrupts to host for initiating data transfer

• Automatic loading of SDIO bus data and automatic discarding of padding data

• Block size of up to 512 bytes

• Interrupt vectors between the host and the slave, allowing both to interrupt each other

• Supports DMA for data transfer

Espressif Systems

ESP32 Datasheet V3.0

ESP32 Datasheet(PDF) 32 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.