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PmodSD™ Reference Manual
Revised April 16, 2015
This manual applies to the PmodSD rev. B
DOC#: 502-123
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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The PmodSD.
Full-size SD card slot
Supports SPI, 1-bit, 4-bit communication
Features include:
Overview
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.
1 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.
1 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.
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PmodSD™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 2 of 2
Pin
Signal
Description
1
~CS
Chip Select / Data3
2
MOSI
MOSI / Command
3
MISO
MISO / Data0
4
SCK
Serial Clock
5
GND
Power Supply Ground
6
VCC
Power Supply (3.3V)
7
DAT1
Data1
8
DAT2
Data 2
9
CD
Card Detect
10
WP
Write Protect
11
GND
Power Supply Ground
12
VCC
Power Supply (3.3V)
A pinout description table and diagram for the 2x6 pin header on the PmodSD can be found below:
Table 1. Connector J1 pin descriptions.
Any external power applied to the PmodSD must be within the specifications of the inserted SD card. As
determined by the SD 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.
3 Physical Dimensions
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.
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