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Sd-card / module gpio, 5 sd-card / module gpio – Kontron COMe Eval Carrier T10 User Manual

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COM Express® Eval Type 10

/ Connectors and Features



23

5.5 SD-Card / Module GPIO

The SD-Card standard is a standard for removable memory storages designed and licensed by the SD Card Association
(http://sdcard.org). The card form factor, electrical interface and protocol are all part of the SD Card specification.
COM Express® Type 1 and Type 10 pin-out based modules may provide a SDIO interface shared with GPIO signals.
Therefore on COM Express® Eval Type 10 a SD-Card connector is available. Please check the documentation of your
module if SDIO is supported and how to enable.

Close configuration jumper J59 (default) to enable SD-Card Slot J43 or open J59 to enable GPIO pin-header J48.

SD-Card J43 PIN Description

SD-Card J43 PIN

Description

1

DAT3/CD - Data Line 3/Card Detection

8

DAT1 - Data Line 1

2

CMD - Command/Response

9

DAT2 - Data Line 2

3

VSS 1 - Supply Voltage - GND

10

Card Detect

4

VDD - Supply Voltage - 3.3V

11

Write Protect

5

CLK - Clock

12

COM (GND)

6

VSS2 - Supply Voltage - GND

13

Shield Ground 0

7

DAT0 - Data Line 0

14

Shield Ground 1

GPIO J48 PIN

Description

GPIO J48 Pin

Description

1

VCC 3.3V

2

GPO0 / SD_CLK

3

GPI0 / SD_DATA0

4

GPO1 / SD_CMD

5

GPI1 / SD_DATA1

6

GPO2 / SD_WP

7

GPI2 / SD_DATA2

8

GPO3 / SD_CD#

9

GPI3 / SD_DATA3

10

GND

Note1: A SD-Card is detected if Card Detect is at low level. The write protection is active (read only) if SD_WP is at

high level.

Note2: The switching circuitry which selects GPIO or SDIO interface may influence the signal quality of SDIO which

results in detection or boot issues with some fast SD/SDHC cards. Therefore it's recommended to reduce
SDIO interface speed to 24MHz in module's BIOS if supported