2.7 eSDHC interface
The LX2160A processor supports two enhanced secured digital host controllers
(eSDHC): eSDHC1 and eSDHC2.
The LX2160ARDB eSDHC1 interface provides a secure digital (SD) connector (J42) for
connecting an SD card to the board. Because the LX2160A processor supports dynamic
EVDD (selectable 1.8 V / 3.3 V), SDHC1_VSEL automatically changes the input/output
voltage to follow the SD card. I2C2 must be programmed in the RCW to serve as the card
detect (CD_B) and write protect (WP) pins for eSDHC1 interface. This happens
automatically when the SD card slot is selected as the boot device.
The figure below shows the eSDHC1 connections in the LX2160ARDB.
VCC = 3V3
LX2160A
OVDD=1V8
SDHC1_CMD
SDHC1_CLK
SDHC1_DS
SDHC1_VSEL
SDHC1_DAT0
SDHC1_DAT1
SDHC1_DAT2
SDHC1_DAT3
SDHC1_DAT4
SDHC1_DAT5
SDHC1_DAT6
SDHC1_DAT7
SDHC/SDXC
CARD SLOT
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
CMD
CLK
CD_B
WP
SDHC
xy GB
SDHC
xy GB
LX2160A
CD_B (I2C2_SCL)
WP (I2C2_SDA)
EVDD=1V8 / 3V3
EVDD
CPLD &
VOLTAGE
SWITCH
3V3
OVDD = 1V8
0=3.3V
1=1.8V
PS_EVDD_VSEL
Figure 2-14. eSDHC1 architecture
The LX2160ARDB eSDHC2 interface is connected to an eMMC device on the board. It
supports either an FBGA169 device or an FBGA153 device. By default, an FBGA169
eMMC device is supported. The table below shows the devices supported by the
eSDHC2 interface.
Chapter 2 LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 0, 09/2018
NXP Semiconductors 37
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