Wiki - Secure digital input/output interface (SDIO)
Support for accessing SD card through SDIO/SPI interface through Keil platform or a firmware coding model?
Some help with the settings of the SDIO Pins.
SPI wiring SDIO pin with MISO and MOSI - Electrical Engineering Stack Exchange
WL1837MOD: WL1837MOD SDIO interface can be used as SPI mode, which pins need to connect to MCU's SPI pins. - Wi-Fi forum - Wi-Fi - TI E2E support forums
How to Use Data Logger - HELPDESK_WJ (Waijung) - Aimagin Support
STM32F4] SDIO - Use external or internal pull-up resistors? : r/embedded
Regarding SDIO devices connecting to WP7607 module - mangOH Red - mangOH forum
Secure Digital I/O Card Pinout, SDIO Flash Card Memory Module Pin Out
Adafruit Micro SD SPI or SDIO Card Breakout Board - 3V ONLY! : ID 4682 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits