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By Pablo2048
#86385 SDIO bus is semi-parallel bus, probably not so fast as USB, but we are talking to slow WiFi standard transceiver in ESP8266 SOC so the throughput is not an issue here. SDIO slave was implemented here to allow SDIO host device to upload the firmware to the SOC RAM/Flash so the ESP can behave like NIC on SDIO. Anyway our use as an freely programmable controller is way better :-) ...
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By RichardS
#86392 I think before 8266 was 8285?? and it was meant to be a network adapter in early generation tablets :-) I believe this was the earliest IC made.

RichardS
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By RichardS
#86402 Right 8089! :-)

RichardS