ZCU104 Board User Guide 37
UG1267 (v1.1) October 9, 2018 www.xilinx.com
Chapter 3: Board Component Descriptions
SD1 (MIO 45-51)
A PS-side interface to an SD card connector is provided for booting and file system storage.
This interface is used for the SD boot mode and supports SD3.0 access post boot.
SD Card Interface
[Figure 2-1, callout 6]
The ZCU104 board includes a secure digital input/output (SDIO) interface to provide access
to general purpose non-volatile SDIO memory cards and peripherals. See the SanDisk
Corporation [Ref 13] or SD Association [Ref 14] websites for more information on the SD
I/O card specification. The ZCU104 SD card interface supports the SD1_LS configuration
boot mode documented in the Zynq UltraScale+ MPSoC Technical Reference Manual
(UG1085) [Ref 2].
The SDIO signals are connected to XCZU7EV MPSoC PS bank 501, which has its V
CCMIO
set to
1.8V. Each of the six MIOxx_SDIO_* nets has a series 30Ω resistor at the source. A
MAX13035E voltage level-translator (U145) is present between the XCZU7EV MPSoC and
the SD card connector (J100).
X-Ref Target - Figure 3-4
Figure 3-4: ULPI U116 Transceiver Circuit
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