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MultiMediaCard/SD/SDIO Card Controller
15.4
Modes of Operation Overview
The MMC/SD/SDIO Card controller has two modes of operation:
•
MMC/SD/SDIO mode
This mode supports the MMC, SD, and SDIO Card communication protocols for data
transfers; only one of the protocols is active at a time.
•
SPI mode
This mode provides the capability to communicate with MMC, SD Card, and SDIO Card
devices.
15.4.1
MMC/SD/SDIO Mode Using MMC Protocol
This subsection provides guidelines for interfacing MMC/SD/SDIO card controller of the PXA27x
processor to MMC devices using the MMC communications protocol.
MMC Protocol Signals
15.4.1.1
See
Table 15-4
with the MMC protocol for interfacing to MMC devices.
Table 15-4.
Multimedia Card Protocol Interface Signals
Signal
Name
MMCLK
MMCMD
MMDAT<0> Bidirectional
II:15-4
for description of the MMC signals of the MMC/SD/SDIO Card Controller used
Direction
(MMC Protocol)
Output
MMC bus clock
Bidirectional
Bidirectional signal for MMC command and response tokens
Bidirectional signal for MMC read and write data
Description
®
Intel
PXA27x Processor Family Design Guide
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