Secure digital input/output interface system

摘要

An interface system includes a secure digital (SD) driver module to communicate with an SD card over a bus, a secure digital input/output (SDIO) driver module to communicate with an SDIO card over the bus, and an input/output port. A method of operating a host in the interface system includes coupling the bus to the SD card while a first mode is enabled, coupling the bus to the SDIO card while a second mode is enabled, and enabling the first mode in response to a request for access to the SD card. The method includes, while the first mode is enabled, (i) listening for a notification signal arriving from the SDIO card via the input/output port, indicating that an interrupt is pending at the SDIO card, and (ii) in response to the notification signal, enabling the second mode to allow the SDIO card to transmit the interrupt to the host.

主权项

1. An interface system, comprising:
a secure digital (SD) driver module configured to communicate with an SD card over a bus; a secure digital input/output (SDIO) driver module configured to communicate with an SDIO card over the bus; a multiplexer configured to operate in one of a first mode or a second mode, wherein (i) while the multiplexer is operating in the first mode, the multiplexer couples the bus to the SD card, and (ii) while the multiplexer is operating in the second mode, the multiplexer couples the bus to the SDIO card; an input/output port configured to communicate with the SDIO card independently of the multiplexer; and a bus control module configured to enable operation of the multiplexer in either the first mode or the second mode, wherein the bus control module is further configured to
enable the operation of the multiplexer the first mode in response to a request for access to the bus by the SD driver module, andwhile the multiplexer is operating in the first mode, (i) listen for a notification signal arriving from the SDIO card via the input/output port, wherein the notification signal indicates that at least one interrupt is pending at the SDIO card, and (ii) in response to arrival of the notification signal, enable the operation of the multiplexer in the second mode to allow the SDIO card to transmit the at least one interrupt to the SDIO driver module via the multiplexer.