Layout Notes - Intel PXA27 Series Design Manual

MultiMediaCard/SD/SDIO Card Controller
15.2 Signals
See Table 15-1
Table 15-1. Multimedia Card/SD/SDIO Card Controller Interface Signal Summary
Signal
MMCLK
MMCMD
MMDAT<0>
MMDAT<1>
MMDAT<2>/
MMCCS<0>
MMDAT<3>/
MMCCS<1>
15.3

Layout Notes

The PXA27x processor MMC/SD/SDIO controller is connected to MMC, SD, and SDIO card
devices, but there are limitations to which device type installs into which socket type. See
Table 15-2
Table 15-2. MMC/SD/SDIO Controller Supported Sockets and Devices
Sockets
SD/SDIO Card socket SD Card device
MMC socket
See Table 15-3
operating modes and communication protocols of the MMC/SD/SDIO controller of the PXA27x
processor.
II:15-2
for the description of MMC/SD/SDIO Card controller signal functions.
Direction
(MMC/SD/SDIO Mode)
Output
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
for information on sockets and devices supported by the MMC/SD/SDIO controller.
SDIO Card device
MMC device
MMC device
for the list of maximum number of memory devices supported for the different
Direction
(SPI Mode)
Output MMC and SD/SDIO bus clock
MMC and SD/SDIO:
Bidirectional line for command and response tokens
Output
SPI:
Output for command and write data
MMC and SD/SDIO:
Bidirectional line for read and write data
Input
SPI:
Input for response token and read data
MMC and SD/SDIO:
Used for SD/SDIO 4-bit data transfers and to signal
SDIO interrupts to the controller
Input
SPI:
Used to signal SDIO interrupts to the controller
SD/SDIO:
4-bit data transfer
Output
SPI:
CS0 chip select
SD/SDIO:
4-bit data transfer
Output
SPI:
CS1 chip select
Devices Supported
®
Intel PXA27x Processor Family Design Guide
Description