SDIO interface specification

From: Graeme (graeme_at_microcommander.com)
Date: 06/10/04 

Date: 10 Jun 2004 12:09:01 -0700

Hello all,

Has anyone had any experience with, or has any technical documentation
on the SDIO card interface? Specifically, I am interested in the
timing of the SD 4-bit bus interface.

I have been searching online and found that SanDisk and the SD Card
Association have good higher level information on the interface, but
they fall short when it comes to the timing diagrams.

I would think that one of the many SDIO manufacturers would have
documents on the timing of signals to the device. However, I have
also been unable to find anything more specific than a brocheur for
these parts.

Has anyone had better luck finding the timing specs for SDIO? Does
anyone have any better suggestions for me? Does one have to be a
member of the SD Card association to implement an interface for SD?

Many thanks,

Graeme Rouse

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