Intel PXA250 and PXA210 manual How to Wire, MultiMediaCard MMC, 2. SDCard Socket Signals

MultiMediaCard (MMC)

5.1.2How to Wire

Notice in the example schematic (Figure 5-1, “Applications Processor MMC and SDCard Signal Connections” on page 5-3) an SDCard socket is used. The signals on the socket are defined in Table 5-2.

Table 5-2. SDCard Socket Signals

Signal Name	Pin #
DAT3	1
CMD	2
VSS1	3
VDD	4
CLK	5
VSS2	6
DAT0	7
DAT1	8
DAT2	9

As stated previously, the PXA250 MMC controller can be connected to either an MMC device or an SDCard device, but you are limited to which device installs in which socket. Refer to Table 5-3for information on sockets and device supported by the MMC controller.

Table 5-3. MMC Controller Supported Sockets and Devices

Sockets	Devices Supported
SDCard socket	SDCard device
	MMC device
MMC socket	MMC device

Figure 5-1is a schematic that supports both MMC and SDCard devices. In the schematic, the signals SA_MMCLK, SA_MMCMD, and SA_DAT correspond to the applications processor signals MMCLK, MMCMD, and MMDAT, respectively. These three signals are also directly connected to the socket.

5-2 PXA250 and PXA210 Applications Processors Design Guide