Nvidia Jetson TX2 NX - SD Card and SDIO Signal Connections

SD Card and SDIO
NVIDIA Jetson TX2 NX DG-10141-001_v1.1 | 53
Parameter Requirement Units Notes
Trace spacing (Microstrip / Stripline) 4x / 3x dielectric
Trace length (SDR50 / SDR25 / SDR12 / HS / DS)
Min
Max
SDR104 / DDR50
Min
Max
16 (100)
139 (876)
16 (100)
83 (521)
mm (ps)
Max trace length/delay skew in/between
CLK
&
CMD
/
DAT
SDR50 / SDR25 / SDR12 / HS / DS
SDR104 / DDR50
14 (87.5)
2 (12.5)
mm (ps)
See Note 3
Keep CLK, CMD and DATA traces away from other signal traces or unrelated power traces/areas or power supply components
Notes:
1. Actual frequencies may be lower due to clock source/divider limitations.
2. If the reference is Power (PWR), then a 0.01uF decoupling cap for return current is required.
Table 9-3. SD Card and SDIO Signal Connections
Function Signal Name Type Termination Description
SDMMC_CLK O SD Card / SDIO Clock: Connect to CLK pin of device.
SDMMC_CMD I/O SD Card / SDIO Command: Connect to CMD pin of device
SDMMC_D[3:0] I/O SD Card / SDIO Data: Connect to Data pins of device