Mmc/Sd/Sdio Mode Using Sd Or Sdio Protocols; 15.4.2.1 Sd And Sdio Protocol Signals - Intel PXA27 Series Design Manual

15.4.2

MMC/SD/SDIO Mode Using SD or SDIO Protocols

This subsection provides guidelines for interfacing the MMC/SD/SDIO card controller of the
PXA27x processor to SD card or SDIO card devices using the SD or SDIO communication
protocols respectively.

15.4.2.1 SD and SDIO Protocol Signals

See Table 15-6
SD or SDIO protocols for interfacing to an SD Card or SDIO Card respectively.
Table 15-6. SD Card and SDIO Card Protocol Interface Signals
Signal Name
MMCLK
MMCMD
MMDAT<0>
MMDAT<1>
MMDAT<2>/MMCCS<0>
MMDAT<3>/MMCCS<1>
®
Intel PXA27x Processor Family Design Guide
for description of the controller signals of the MMC/SD/SDIO Card used with the
Direction
(SD/SDIO
Protocol)
Output
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
MultiMediaCard/SD/SDIO Card Controller
Description
SD/SDIO bus clock
Bidirectional signal for SD/SDIO command and response
tokens
Bidirectional signal for SD/SDIO read and write data
Bidirectional signal for SD/SDIO 4-bit data transfers and to
signal SDIO interrupts to the controller
Bidirectional signal for SD/SDIO 4-bit data transfers only
Bidirectional signal for SD/SDIO 4-bit data transfers only
II:15-7