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4
External signals and pin multiplexing
The following table lists the I/O multiplexing (IOMUX) of the ConnectCore 8X System-on-module. Most of the castellated pads are associated with
(connected to) an LGA pad; this relationship is highlighted in the "Associated LGA Pad name" column.
The microprocessor used on this module, like all CMOS devices, can be driven into a latch-up condition if any I/O pin is driven outside of its
associated power rail. Care must be taken to:
n
Never drive an I/O pin beyond its positive rail or below ground.
n
Never drive an I/O pin from an external power source during the power-on or reset sequences.
n
Never hot-swap the module or interrupt its ground connection to external circuitry.
Latch-up is a condition that can cause excessive current draw and result in excessive heating of the microprocessor or its power supplies. This
excessive heating can permanently damage the microprocessor and/or its supporting components.
Castellated pad signals and multiplexing
Castellated
pad #
Associated
LGA Pad
name
ConnectCore 8X
signal name
i.MX 8X pin name*
Multiplexing
Power group
Comments
1
E4
USDHC1_RESET_B
USDHC1_RESET_B
ALT0:
USDHC1_RESET_B
ALT1:
NAND_RE_N
ALT2:
SPI2_SCK
ALT3:
ALT4:
GPIO4_IO19
VDD_USDHC1
2
E3
USDHC1_VSELECT
USDHC1_VSELECT
ALT0:
USDHC1_VSELECT
ALT1:
NAND_RE_P
ALT2:
SPI2_SDO
ALT3:
NAND_RE_B
ALT4:
GPIO4_IO20
VDD_USDHC1
