Seco COM-Express CCOMe-C79 User Manual page 57

GPIO pin header / microSD Card Slot
GPIO pin header
Pin Signal
1 GPO0
3 GPO1
5 GPO2
7 GPO3
9 GND
JP10 position GPIO/microSD selector
Not inserted GPIO
Inserted microSD
GPO[0:3]: General purpose output signals
GPI[0:3]: General purpose input signals
μSD Card Slot
CN33
Pin Signal
1 SDIO_DAT2
2 SDIO_DAT3
3 SDIO_CMD
4 +3.3V_RUN
5 SDIO_CLK
6 GND
7 SDIO_DAT0
8 SDIO_DAT1
CardDetect SD_CD#
CCOMe-C79
CCOMe-C79 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by E.S. Copyright © 2021 SECO S.p.A.
CN31
Pin Signal
2 +3.3V_ALW
(with 1.5 resettable fuse)
4 GPI0
6 GPI1
8 GPI2
10 GPI3
The
module, push-push type, H=1.68 mm, type JST DM3AT-SF-PEJM5 or equivalent. When this interface
is available, this card slot is accessible with jumper JP10 inserted.
Signals description
SD_CD#: Card Detect Input. This signal is grounded when the card is inserted.
SD_CLK: SD Clock Line (output).
SD_CMD: Command/Response bidirectional line.
SDIO_DAT[0÷3]: 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.
According to the release 3.0 of COM Express specifications, on the same pins are
multiplexed the signals necessary for the implementation of 4-bit SD cards with four
General Purpose Inputs plus four general Purpose Outputs. Effective support of
GPI+GPO signals or SDIO interface depends on the module used. Please refer to the
User Manual of the COM Express module used for a detail about the interface
support.
The selection between SD Card interface and GPI/O interface is made using
jumper JP10, according to the table on the left.
If supported by the COM Express module installed on CCOMe-C79,
the GPIO interface, is available on CN31, which is a dual row, 10 pin,
P2.54mm standard pin header, type ADIMPEX p/n LE008210-R, with the pinout
shown in the table on the left. To redirect the signal coming directly from COM
Express module to GPIO header, jumper
33), soldered on bottom side of the
57