SBC-C61
SBC-C61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: S.B. - Reviewed by N.P. - Copyright © 2021 SECO S.p.A.
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3.3.13
microSD Slot
The NXP i.MX8M Mini family of processors embeds three Ultra Secured Digital Host controllers (uSDHC), able to support SD /
SDXC Cards.
For this reason, on SBC-C61 board there is also a socket, for the use of standard microSD cards, which
can be used as Mass Storage and/or Boot Devices.
The connector is a microSD connector, push-push type, H=1.68 mm, type JST DM3AT-SF-PEJM5 or
equivalent.
SD2_CD_B: Card Detect Input.
SD2_CLK: SD Clock Line (output).
SD2_CMD: Command/Response bidirectional line.
SD2_DATA[0÷3]: SD Card data bus. SD2_DATA0 signal is used for all communication modes. SD2_DATA[1÷3] signals are
required for 4-bit communication mode.
SD2_PWR voltage
is derived from VDD_3V3 power rail. It can be switched on and off via SW (USDHC2_RESET_B signal,
managed using the i.MX8M Mini pad SD2_RESET_B).
3.3.14
JTAG Connector
The i.MX8M Mini processors include a System JTAG Controller (SJC) providing debug and
test control with the maximum security. On SC61 board, the JTAG interface working is
fixed to Debug mode and can be accessed through connector header CN3, type JST p/n
SM07B-SRSS-TB or equivalent, with the pinout shown on the left table.
Mating connector: JST 07SR-3S receptacle with JST SSH-003T-P0.2-H female crimp
terminals.
All these JTAG signals are directly connected to i.MX8 pins with same name. Please refer to i.MX8M Mini processor
’
s
documentation for a description of the signals and their usage.
microSD Card Slot CN56
Pin
Signal
1
SD2_DATA2
2
SD2_DATA3
3
SD2_CMD
4
SD2_PWR
5
SD2_CLK
6
GND
7
SD2_DATA0
8
SD2_DATA1
CardDetect SD2_CD_B
JTAG Connector CN3
Pin
Signal
1
VDD_1V8
2
JTAG_TCK
3
JTAG_TMS
4
JTAG_TDI
5
JTAG_TDO
6
JTAG_TRST_B
7
GND
