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22 Sept 2016
v1.1
2.18 microSD Card Interface
The Zynq PS SD/SDIO peripheral controls communication with the FMC-V2 carrier’s microSD
Card. The microSD card can be used for non-volatile external memory storage as well as
booting the Zynq-7000 AP SoC. PS peripheral sd0 is connected through Bank 1/501 MIO[40-
46], including Card Detect.
The microSD Card is a 3.3V interface is connected through MIO Bank 1/501 which is set to
1.8V. To interface to the SD card, the carrier card uses a Texas Instrument TXS02612RTWR
voltage level translator IC. This part includes a 6-channel SPDT switch with voltage-level
translation capability.
The TXS02612 has three separate supply rails that operate over the full range of 1.1 V to 3.6 V.
This allows the Zynq MIO and SDIO peripherals to operate at different supply voltages.
The microSD Card is connected through an 8-pin micro SD card connector, J13, Molex
502570-0893. Note that this connector’s supported temperature range is -25° to 85° C. A Class
4 card or better is recommended. Up to 32 GB is supported. If a user intends to use the
microSD card interface at industrial temperatures, an industrial temperature microSD card is
required. Please request more information on this from your local Avnet representative.
Alternatively, the customer can load their image on the eMMC memory on the SOM.
SOM Net
Name:
Carrier Net
Name:
JX3
Pin #
J13 SD
Card
Pin:
PS_MIO41
SD_CMD
34
P3
PS_MIO43
SD_D1
36
P8
PS_MIO42
SD_D0
37
P7
PS_MIO45
SD_D3
38
P2
PS_MIO44
SD_D2
39
P1
PS_MIO46
SD_CD
41
G4
PS_MIO40
SD_CLK
43
P5
Table 18 – microSD Card Pin assignments
Figure 18 – microSD card interface