AN 509: Multiplexing SDIO Devices Using Altera MAX Series

ID 683683
Date 9/22/2014

1. Multiplexing SDIO Devices Using Altera MAX Series

This design example shows the capability of Altera® MAX® II, MAX V and MAX 10 devices to implement a Secure Digital (SD) or Secure Digital Input Output (SDIO) device multiplexer. The SD or SDIO has the capability to multiplex two or more SD/SDIO devices to an SD/SDIO host equipped with a single SD interface. This document also illustrates how the select line of this multiplexer can be controlled through an I2C interface.

The supported Altera devices are an excellent choice to implement SD/SDIO device multiplexers. The supported devices’ low power, high I/O pin count, and ability to tolerate any possible power-on sequence on their core and I/O banks make them an ideal choice in this application.