Intel PXA27 Series Design Manual page 175

See Figure 15-4
Card controller and an SD/SDIO Card socket.
Figure 15-4. SD and SDIO Protocol Interface Schematic Diagram
Write Protect
to CPLD/GPIO
Card Detect
to CPLD/GPIO
MMDAT<3>/MMCCS<1>
MMDAT<2>/MMCCS<0>
®
Intel PXA27x Processor Family Design Guide
for the detailed schematic diagram of the interface between the MMC/SD/SDIO
Debounce Circuitry
Debounce Circuitry
MMDAT<1>
MMDAT<0>
MMCLK
R7
51K
MMCMD
MultiMediaCard/SD/SDIO Card Controller
R5 R4
100K 100K
3.3V
R2 R3
51K 51K
8
7
6
5
3.3V 3.3V
4
R6 R1
C1
3
51K 10K
0.1 uF
2
1
3.3V
12 11 10
CD COMM WP
SD/SDIO
DAT1
Card Socket
DAT0
VSS2
CLK
VDD
VSS1
CMD
DAT3_CD
9
DAT2
MMC_007_P2
II:15-9