SDIO standard is specifically meant for devices like camera that have an SD card. Still in many of the applications I found that the SDIO is also used to interface with WiFi chips. Why is that so? Can someone help me to understand this?

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    \$\begingroup\$ Would you care to justify your initial statement?. My first response is 'No it wasn't. Although related, SD-Card & SDIO are not the same thing.' \$\endgroup\$ – brhans Sep 4 '16 at 13:46
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    \$\begingroup\$ What else would you use SDIO with? Because you certainly wouldn't use it for SD cards... \$\endgroup\$ – Ignacio Vazquez-Abrams Sep 4 '16 at 14:49
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    \$\begingroup\$ I suspect this started more with early PDAs that needed to support sd cards, and extending the protocol as a miniature module socket, perhaps in a second channel and then on-board made sense. Today you see SDIO wifi in a lot of low cost tablets, that are somewhat the heirs to the role of those PDAs. \$\endgroup\$ – Chris Stratton Sep 4 '16 at 16:16

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