CQ7-A30
CQ7-A30 - Rev. First Edition: 1.0 - Last Edition: 2.0 - Author: S.B. - Reviewed by G.G. Copyright © 2016 SECO S.r.l.
42
3.3.10
SD card slot
Since Qseven
®
standard contemplates signals for Secure Digital Input/Output and MultiMedia
Cards, on CQ7-A30 carrier board there is also a socket, for the use of standard SD or MMC
cards, to be used as Mass Storage Device and/or Boot Device (if the Qseven
®
used with this
carrier board implements this functionality).
Please refer to the User Manual of the used Qseven
®
module for information
about Card types supported by the chipset.
The connector used is a combo SD/MMC slot, push-push type, H=3.2 mm.,
type PROCONN SDSN13-A0-0005 or equivalent. Pinout here reported is
related only to signal routing on specific connector, internally the pin-out is the
same of any standard SD or MMC 4.0 card.
For ESD protection, on all signal lines are placed clamping diodes for voltage
transient suppression.
Signals related to SDIO/MMC cards are the following:
SDIO_CD#: Card Detect Input.
SDIO_CLK: SD Clock Line (output).
SDIO_CMD: Command/Response bidirectional line.
SDIO_DAT[0÷7]: SD Card data bus. SDIO_DAT0 signal is used for all communication modes. SDIO_DAT[1÷3] signals are required for 4-bit communication mode.
SDIO_DAT[5÷7] signals are also required for 8-bit communication mode.
SDIO_WP: SD Write Protect Input. This signal denotes the state of the write-protect tab on SD cards.
A red LED (D28) is placed near the SD Card Slot.
It will blink to signal activity (i.e. data transfers) on the SDIO interface.
SD Card Slot - CN36
Pin Signal
Pin Signal
1
SDIO_DAT2
9
SDIO_CLK#
2
SDIO_DAT3
10
SDIO_DAT6
3
SDIO_DAT4
11
GND
4
SDIO_CMD
12
SDIO_DAT7
5
SDIO_DAT5
13
SDIO_DAT0
6
SDIO_CD#
14
SDIO_DAT1
7
GND
15
SDIO_WP
8
+3.3V_S
16
GND
