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22.8.2018 Pmod MicroSD Reference Manual [Reference.Digilentinc]

https://reference.digilentinc.com/reference/pmod/pmodmicrosd/reference-manual 6/7

2 MOSI () MOSI () / Command 8 DAT2 Data 2

3 MISO () MISO () / Data0 9 CD Card Detect

4 SCK Serial Clock 10 NC () Not Connected

5 GND () Power Supply Ground 11 GND () Power Supply Ground

6 VCC () Power Supply (3.3V) 12 VCC () Power Supply (3.3V)

Any external power applied to the Pmod MicroSD must be within the specifications of the inserted microSD card. As determined by the

SD card association (https://www.sdcard.org/developers/overview/capacity/), this voltage range must be within 2.7 to 3.6 volts. The 3.3

operating voltage on Digilent system boards nicely complies with this standard.

The pins on the pin header are spaced 100 mil apart. The PCB is 1.8 inches long on the sides parallel to the pins on the pin header and

1.8 inches long on the sides perpendicular to the pin header.

The schematics of the Pmod MicroSD are available here (https://reference.digilentinc.com/reference/pmod/pmodmicrosd/schematic).

Additional information about the standard SD protocol can be found from the SD Card Association here in the Physical Layer

Simplified Specification (Version 4.0) (https://www.sdcard.org/downloads/pls/)

The open source Arduino IDE (https://www.arduino.cc/en/Main/Software) software comes pre-loaded with an SD library that can be

used to interface the Pmod MicroSD with microcontroller boards.

Digilent's library of Vivado IPs contains the PmodSD () IP core, which can be used to interface the Pmod MicroSD with a baremetal

Zynq or Microblaze processor. A tutorial for how to do this can be found here (https://reference.digilentinc.com/learn/programmable-

logic/tutorials/pmod-ips/start).

If you have any questions or comments about the Pmod MicroSD, feel free to post them under the appropriate section (“Add-on

Boards”) of the Digilent Forum (https://forum.digilentinc.com/).

rm (https://reference.digilentinc.com/tag/rm?do=showtag&tag=rm), doc (https://reference.digilentinc.com/tag/doc?do=showtag&tag=doc),

pmodmicrosd (https://reference.digilentinc.com/tag/pmodmicrosd?do=showtag&tag=pmodmicrosd)

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