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PXA250 and PXA210 Applications Processors Design Guide 5-5
MultiMediaCard (MMC)
Warning: Connecting VSS2 to something other than the power supply ground violates The MultiMediaCard
System Specification, Version 2.1. Because the MMC specification does not state that VSS1 and
VSS2 must be connected internal to the MMC device, the design in Figure 5-1 may not work with
all MMC devices. Use caution when using the card detection method shown in Figure 5-1.
5.1.3 Simplified Schematic
Figure 5-2 shows another SDCard socket. In this case, all applications processor signals are
connected to the socket. This socket does not have a common signal for the write protect and card
detect and are connected to the two tabs shown on the left side of the diagram. Inserting a card into
the socket may cause the write protect signal and will cause the card detect signal to change states
and must be interpreted by the CPLD software.
Figure 5-2. Applications Processor MMC to SDCard Simplified Signal Connection
A8699-01
12 13
DAT1
MMDAT
MMCLK
MMCMD
MMCCS0
SD_CD
SD_WP
8
DAT0
WP
+3.3V
CD
VSS2
CLK
VDD
VSS1
CMD
CD/DAT3
DAT2
5638 SDMC_NORMAL_SPRG_EJCT
Kyoc 10 5638 009 353 833
GND
ESD
11
Rx
10K Ω
5% 0.1W
Rx
10K Ω
5% 0.1W
Rx
10K Ω
5% 0.1W
Rx
10K Ω
5% 0.1W
10
9
1
7
6
5
4
3
2
Jx