Single SDIO Interface with Multiple SDIO Units

摘要

A system and method communicates with one of two or more secure digital input output (SDIO) units that only one SDIO unit responds when it is being addressed. The SDIO unit has an SDIO clock input port, an SDIO data bus output port, and an SDIO bidirectional command port. Each SDIO unit has an address indicator within it associated with each SDIO unit. An SDIO unit will not respond to an SDIO command unless an SDIO unit address encoded in the SDIO command matches its address indicator.

主权项

1. A secure digital input/output (SDIO) system comprising:
a host; an SDIO interface connected to the host; a first SDIO unit connected to the SDIO interface, wherein the first SDIO unit is configured with a first SDIO address; a second SDIO unit connected to the SDIO interface, wherein the second SDIO unit is configured with a second SDIO address; wherein the first SDIO unit and the second SDIO unit are configured to receive from the host an SDIO command with an associated command address, wherein the command address indicates whether the first SDIO unit or the second SDIO unit is to respond to the SDIO command, and wherein the first SDIO unit and the second SDIO unit are configured to determine if the first SDIO unit or the second SDIO unit is to respond to the SDIO command based, at least in part, on one or more of the group of: the command address, the first SDIO address, and the second SDIO address.