Nvidia Jetson TX2 NX User Manual

SD Card and SDIO
NVIDIA Jetson TX2 NX DG-10141-001_v1.1 | 52
Figure 9-1. SD Card Connection Example
ESD
DATA2
DATA3
CMD
VDD
CLK
GND
DATA0
DATA1
C_DETECT
COMMON
VDD_3V3_SYS
TPS22917DBVT
Load S witch
VO UTVIN
SDMMC_VDD_E N
GND
0Ω
Jetson
Tegr a
SDMMC3
SDMMC3_ CLK
SDMMC3_ CMD
SDMMC3_ DAT3
SDMMC_CLK
SDMMC_CMD
SDMMC_DAT0
SDMMC_DAT1
SDMMC_DAT2
SDMMC_DAT3
GP IO
GP IO
SDMMC3_ DAT2
SDMMC3_ DAT1
SDMMC3_ DAT0
227
229
#
#
219
221
223
225
0.1uF 10uF
EN
QOD
0.1uF
GND
SDMMC_CD
Se e No te 2
Se e No te 1
Notes:
1. The SD Card supply must be enabled with a GPIO to prevent back-driving the Tegra X2
SDMMC interface during power-on sequencing. The GPIO should have power-on reset (POR)
that will ensure the supply is not enabled by default.
2. Having 0Ω, 0402 resistor is recommended in case of issues with EMI where it can be replaced
with an appropriate device.
3. It is recommended that the SD card supply is current limited in case the supply is shorted to
GND.
Table 9-2. SD Card and SDIO Interface Signal Routing Requirements
Parameter Requirement Units Notes
Max frequency
3.3V Signaling
DS
HS
1.8V Signaling
SDR12
SDR25
SDR50
SDR104
DDR50
25 (12.5)
50 (25)
25 (12.5)
50 (25)
100 (50)
208 (104)
50 (50)
MHz (MB/s)
See Note 1
Topology Point to point
Reference plane
GND
or
PWR
See Note 2
Trace impedance 50 Ω ±15%. 45Ω optional depending
on stack-up
Max via count
PTH
HDI
4
10
Independent of stack-up layers.
Depends on stack-up layers.
Via proximity (Signal to reference)
< 3.8 (24) mm (ps)
Up to four signal vias can share
1
GND
return via

Nvidia Jetson TX2 NX Specifications

General

Brand	Nvidia
Model	Jetson TX2 NX
Category	Computer Hardware
Language	English