SDIO interface specification

Graeme · 2004-06-10T19:09:01+00:00

Hello all, Has anyone had any experience with, or has any technical documentationon the SDIO card interface? Specifically, I am interested in thetiming of the SD 4-bit bus interface.I have been searching online and found that SanDisk and the SD CardAssociation have good higher level information on the interface, butthey fall short when it comes to the timing diagrams.I would think that one of the many SDIO manufacturers would havedocuments on the timing of signals to the device. However, I havealso been unable to find anything more specific than a brocheur forthese parts.Has anyone had better luck finding the timing specs for SDIO? Doesanyone have any better suggestions for me? Does one have to be amember of the SD Card association to implement an interface for SD?Many thanks, Graeme Rouse