Digilent 410-123P User Manual

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Revision: December 18, 2009
Note: This document applies to REV B of the board.

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Overview

The PmodSD Secure Digital memory card
module provides a convenient SD card slot for
use with Digilent system and microcontroller
boards.

Features include:

• a 2x6 pin header

• an SD card slot

Functional Description

The PmodSD connects to all communication
and power signals from a standard SD card
and brings them out to the 2x6 pin header on
the board.

The pinout placement on the PmodSD is
designed to readily communicate with a
Digilent system board via SPI. The SPI
interface standard uses four signal lines: SS
(slave select), MOSI (master out slave in),
MISO (master in slave out), and SCK (serial
clock).

SD cards can also be driven in a native mode
that also uses the DAT1 and DAT2 signals as
well as the DAT0, DAT3, CMD, and CLK
signals.

The WP signal can be set by a switch on the
SD card to prevent the host from writing or
erasing data on the card. The CD signal can
be used by the host to indicate that a card is in
the SD slot and is detectable.

For more information on the necessary
commands to communicate with an SD card,
see the card’s data sheet.

215 E Main Suite D | Pullman, WA 99163

[phone] Voice and Fax

1 SS CS/DAT3

2 MOSI DI/CMD

3 MISO DO/DAT0

4 SCK CLK

5 GND VSSI

6 VCC VDD

SD card slot

7 DAT1 DAT1

8 DAT2 DAT2

9 CD CD

10 WP WP
11 GND VSSI

12 VCC VDD

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