Sd Card Interface - Xilinx ZC702 User Manual

SD Card Interface

[Figure 1-2, callout 5]
The ZC702 board includes a secure digital input/output (SDIO) interface to provide
user-logic access to general purpose nonvolatile SDIO memory cards and peripherals.
Information for the SD I/O card specification can be found at the SanDisk Corporation
[Ref 16] or SD Association
The SDIO signals are connected to XC7Z020 SoC PS bank 501 which has its VCCMIO set to
1.8V. A TXB02612 SDIO port expander with voltage-level translation (U61) is used between
the XC7Z020 SoC and the SD card connector (J64).
Figure 1-8 shows the connections of the SD card interface on the ZC702 board.
X-Ref Target - Figure 1-8
22 SDIO_CD_DAT3
22 SDIO_CMD
22 SDIO_CLK
22 SDIO_DAT0
22 SDIO_DAT1
22 SDIO_DAT2
8 SDIO_SDDET
8 SDIO_SDWP
ZC702 Board User Guide
UG850 (v1.7) March 27, 2019
[Ref 17] websites.
VCCMIO_PS
1 R381 1 R380 1 R321
4.7K 4.7K 4.7K
1/10Ω 1/10Ω 1/10Ω
2 2 2
5% 5% 5%
Figure 1-8: SD Card Interface
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VCC3V3
C27
1
0.1μF
2 25V
X5R
GND
67840-8001
1
CD_DAT3
2
CMD
3
VSS1
4
VDD
5
CLK
6
VSS2
7
DAT0
8
DAT1
IOGND2
9
DAT2
IOGND1
GNDTAB4
10
DETECT
GNDTAB3
11
PROTECT
GNDTAB2
12
DETECT_PROTECT
GNDTAB1
J64
GND
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Feature Descriptions
18
17
16
15
14
13
GND
UG850_c1_08_032719
26