AXEL Lite SOM/AXEL Lite Hardware/Peripherals/SDIO

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ID# Issue Date Notes


27/10/2020 New documentation layout

Peripheral SDIO[edit | edit source]

AXEL Lite SOM provides up to three SDIO interfaces; due to PINMUX restrcitions and usa of the NAND controller onboard, a typical usage on AXEL Lite SOM is the following one:

  • SD1 configured in 4-bit mode and used as boot device (with BOOT_SEL)
  • SD2 configured in 4-bit mode
  • SD3 configured in 8-bit mode: a typical connection for this interface is forx interfacing an external eMMC storage device

Description[edit | edit source]

The SDIO interface available on AXEL Lite is based on i.Mx6 SoC.

The SDIO port supports the following standards and features:

  • 1-bit or 4-bit transfer mode specifications for SD and SDIO cards up to UHS-I SDR-104 mode (104 MB/s max)
  • 1-bit, 4-bit, or 8-bit transfer mode specifications for MMC cards up to 52 MHz in both SDR and DDR modes (104 MB/s max)
  • Compatible with SD Memory, miniSD Memory, SDIO, miniSDIO, SD Combo, MMC and MMC RS, embedded MMC and embedded SD cards
  • Up to 200 Mbps data transfer for SD/SDIO cards using 4 parallel data lines
  • Up to 416 Mbps data transfer for MMC cards using 8 parallel data lines
  • Up to 832 Mbps data transfer for MMC/SD cards using 8 parallel data lines in DDR mode
  • Dual internal 32x32-bit FIFOs

Pin mapping[edit | edit source]

The Pin mapping is described in the Pinout table section