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SDIO Emulation Over SPI Without SPI Mode in SDHC Master

IP.com Disclosure Number: IPCOM000197935D
Publication Date: 2010-Jul-22

Publishing Venue

The IP.com Prior Art Database

Abstract

SDIO (Secure Digital Input & Output) and SPI (Serial Peripheral Interface) are two completely different protocols. To be able to interact with a SDIO Host (Master), a device (Slave) would need to support SDIO mode (1 bit or 4 bit) or SPI mode. This paper provides technique to allow SDIO Host to interface directly with SPI slave thereby allowing it to send and receive packets. This is useful for any device (Slave) that does not support 1bit or 4 bit SDIO and only supports SPI interface.