The Digilent Pmod MicroSD (Revision A) allows system boards to read from and write to microSD cards. With no
limitation on the file system or memory size of the microSD card, users will be able to store and access large amounts of
data from their system board.
Pmod MicroSD Reference Manual
MicroSD card slot
Store and access large amounts of data from your system board
No limitation on file system or memory size of microSD card used
1-bit and 4-bit communication
12-pin Pmod port with SPI interface
The Pmod MicroSD is a great way to store and access information on a device that can then be accessed by outside devices
such as a phone or computer.
The Pmod MicroSD is designed to communicate with the host board primarily through theSPI protocol. By default, the
microSD card itself is defined to boot up in SD mode, but will enter into SPI mode when the Chip Select line is pulled low.
The actual technique of writing to and reading from specific locations on an microSD goes beyond the scope of this
document, but the complexity of the process is nicely abstracted away within the chipKIT SD library and
DigilentPmodSDIP Core.
Features
Functional Description
Interfacing with the Pmod
A pinout description table for the 2×6 pin header on the Pmod MicroSD can be found below:
Any external power applied to the Pmod MicroSD must be within the specifications of the inserted microSD card. As
determined by theSD card association, 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 availablehere. Additional information about the standard SD protocol can be
found from the SD Card Association here in thePhysical Layer Simplified Specification (Version 4.0)
The open sourceArduino IDEsoftware 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 thePmodSDIP 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 foundhere.
If you have any questions or comments about the Pmod MicroSD, feel free to post them under the appropriate section
(“Add-on Boards”) of theDigilent Forum.
Connector J1- Pin Descriptions
Pin Signal Description Pin Signal Description
1 ~CS Chip Select / Data3 7 DAT1 Data 1
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 Gr
6 VCC Power Supply (3.3V) 12 VCC Power Supply (3
Physical Dimensions
Additional Information
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