Filter
Top Products
ZEUS Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue D 39
SDIO
The SD card socket J22 is interfaced directly to PXA270’s MMC/SD/SDIO controller.
The MMC/SD/SDIO controller supports multimedia card, secure digital and secure
digital I/O communications protocols. The MMC controller supports the MMC system, a
low cost data storage and communications system. The MMC controller in the PXA270
processor is based on the standards outlined in the MultiMediaCard System
Specification Version 3.2. The SD controller supports one SD or SDIO card based on
the standards outlined in the SD Memory Card Specification Version 1.01 and SDIO
Card Specification Version 1.0 (Draft 4).
The MMC/SD/SDIO controller features:
• Data transfer rates up to 19.5Mbit/s for MMC, 1-bit SD and SPI mode data
transfers, and up to 9.75Mbit/s for 1-bit SDIO.
• Data transfer rates up to 78Mbit/s for 4-bit SD data transfers, and up to 39Mbit/s for
SDIO.
• Support for all valid MMC and SD/SDIO protocol data transfer modes.
This is a hot swappable 3.3V interface, controlled by the detection of a falling edge on
GPIO53 when an SD card has been inserted, and a rising edge when an SD card is
removed.
SD card write protection is connected to PXA270’s GPIO52, and card detect to
GPIO53.
A variety of SDIO cards are available, such as a Bluetooth and IEEE802.11b (WiFi).
More information can be found here: www.sdcard.org/sdio
.