ONDA Plus SOM/ONDA Plus Hardware/Peripherals/SDIO
| HOME | SOMs | SBCs | ToloMEO Embedded Assistant |  GET A QUOTE
|
 ONLINE HELPDESK
|
| Roadmap | IoT Services | ML/AI services | Embedded Design Services |
| History | |||
|---|---|---|---|
| Issue Date | Notes | ||
| 2026/08/18 | First documentation release | ||
Contents
Peripheral SDIO[edit | edit source]
The two SD/SDIO controller controllers are compatible with the standard SD Host Controller Specification Version 3.0. The controllers communicate with SDIO devices and SD memory cards with data transfers in 1-bit and 4-bit modes.
The SDIO Card Interface supports the maximum data rate in Standard mode (19 MHz), High-speed mode (50 MHz), SDR12 (25 MHz), SDR25 (50 MHz), SDR50 (100 MHz), SDR104 (200 MHz), DDR50 mode (50 MHz).
The following table describes the external ONDA Plus interface signals for the SD card interface (MIO bank 501, pins PS_MIO[46:51] and optional PS_MIO[43], PS_MIO[45]):
| Pin name | Conn. pin | Function | Notes |
|---|---|---|---|
| PS_MIO45_501 | J1.C44 | SD/SDIO/MMC CD | Card detect (optional) pin |
| PS_MIO46_501 | J1.C46 | SD/SDIO/MMC data 0 | - |
| PS_MIO47_501 | J1.C47 | SD/SDIO/MMC data 1 | - |
| PS_MIO48_501 | J1.C48 | SD/SDIO/MMC data 2 | - |
| PS_MIO49_501 | J1.C49 | SD/SDIO/MMC data 3 | - |
| PS_MIO50_501 | J1.C51 | SD/SDIO/MMC command | - |
| PS_MIO51_501 | J1.C52 | SD/SDIO/MMC clock | - |
These signals are referenced to VCC_B501 (see dedicated section in the hardware manual).
