Multiple access single SDIO interface with multiple SDIO units

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. In some configurations, a single multiple SDIO (MSDIO) command may cause two or more SDIO units to return data to a host. 种系统和方法与两个或更多个安全数字输入输出(SDIO)单元中的个安全数字输入输出单元进行通信，在所述个安全数字输入输出单元正在被寻址时只有个SDIO单元响应，该SDIO单元具有SDIO时钟输入端口、SDiO数据总线输出端口和SDIO双向命令端口。每个SDIO单元内具有与每个SDIO单元相关联的地址指示符。除非在SDIO命令中编码的SDIO单元地址与SDIO单元的地址指示符相匹配，否则SDIO单元将不会对SDIO命令进行响应。在些配置中，单个多SDIO(MSDIO)命令可以使得两个或更多个SDIO单元向主机返回数据。