Secure Digital Input/Output [SDIO] is a flash based removable memory card. The card format may also be used for other device functions in addition to data storage. Secure Digital IO uses a 9-Pin connector [1 row of 9 pins]. SDIO is based on the Secure Digital SD card. SDIO is compatible with the SD memory card, and fits in the same socket.
The Secure Digital I/O card dimensions are: 24mm wide x 32mm long x 2.1mm thick.
There are two types of SDIO cards; a full-speed version, and a slow-speed version. The full-speed version will operate with a 1-bit and 4-bit SD transfer mode, both with a clock ranging from 0Hz to 25MHz. The 4-bit version operating at 25MHz has a transfer rate of 100Mbps. The slow-speed version will use the 1-bit mode and may have the 4-bit mode, but only operates at a transfer rate of between 0Hz and 400kHz. The slow-speed version is not intended for memory functions. The SDIO card support the SPI bus interface. The SDIO mechanical form factor is shown above; however a few gaps "lock notches" are not shown. The SDIO card may exceed 24mm in width after 37mm in length, and the width may be thicker then 2.1mm after 37mm in length
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| 1 | CD/DAT[3] | Data Line 3 | N/C | Not Used | CS | Card Select |
| 2 | CMD | Command Line | CMD | Command Line | DI | Data Input |
| 3 | VSS1 | Ground | VSS1 | Ground | VSS1 | Ground |
| 4 | VDD | Supply Voltage | VDD | Supply Voltage | VDD | Supply Voltage |
| 5 | CLK | Clock | CLK | Clock | SCLK | Clock |
| 6 | Vss2 | Ground | Vss2 | Ground | Vss2 | Ground |
| 7 | DAT[0] | Data Line 0 | DATA | Data Line | DO | Data Output |
| 8 | DAT[1] | Data Line 1 / Interrupt | IRQ | Interrupt | IRQ | Interrupt |
| 9 | DAT[2] | Data Line 2 /Read Wait | RW | Read Wait | NC | Not Used |
The graphic below provides a comparison of the different removable memory card standards. Many of the different Memory Card standards have descriptions listed on this web site. The different standards based on card size are provided. Refer to the Personal Computer Buses page for more information for different memory types, as listed here.
Refer to this page for a list of different Flash Memory Stick Formats.
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The graphic to the right shows: The MicroSD form factors picture is used under GNU License |
 Comparison of SD Memory Card sizes SD Card, miniSD Card, microSD Card |
{Back to Secure Digital IO Card Index}
Engineering Design Key words: SD, Secure Digital, SDIO, DataFlash card, MultiMedia Card, MMC Card, Form Factor, SPI, pinout, Pin out Personal Computer Memory Card International Association, PC Card, Interconnect, Electrical layer, Interface Standard Data Bus, Standard, Specification, Spec, Interface, Removable, IC, Physical Interface, Description, Manufacturer, Personal Computer, PC, Pin-out, Connector Pins
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