Full-sized SD Card Slot
The Digilent PmodSD allows system boards to read from and write to SD cards. With no limitation on the file system or memory size of the SD card, users will be able to store and access large amounts of data from their system board.
Functional Description
The PmodSD 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.
Interfacing with the Pmod
The PmodSD is designed to communicate with the host board primarily through the SPI protocol. By default, the SD 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 SD goes beyond the scope of this document, but the complexity of the process is nicely abstracted away within the chipKIT SD library.