Table 10-3. Sd Card And Sdio Signal Connections - Nvidia Jetson Xavier NX Design Manual

Parameter
HDI
Via proximity (Signal to reference)
Trace spacing – Microstrip / Stripline
Trace length
SDR50 / SDR25 / SDR12 / HS / DS
Min
Max
SDR104 / DDR50
Min
Max
Max trace length/delay skew in/between CLK
and CMD/DAT
SDR50 / SDR25 / SDR12 / HS / DS
SDR104 / DDR50
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 PWR, 0.01uF decoupling cap required for return current.

Table 10-3. SD Card and SDIO Signal Connections

Function Signal Name
SDMMC_CLK
SDMMC_CMD
SDMMC_D[3:0]
GPIO
NVIDIA Jetson Xavier NX
Requirement
10
< 3.8 (24)
4x / 3x
16 (100)
139 (876)
16 (100)
83 (521)
14 (87.5)
2 (12.5)
Type Termination Description
O SD Card / SDIO Clock: Connect to CLK pin of device.
I/O SD Card / SDIO Command: Connect to CMD pin of device
I/O SD Card / SDIO Data: Connect to Data pins of device
I SD Card Detect (Optional): Connect available GPIO on module to
CD pin of SD Card socket.
Units Notes
mm (ps) Up to four signal vias can share 1 GND
return via
dielectric
mm (ps)
See Note 3
mm (ps)
DG-09693-001_v1.7 | 63
SD Card and SDIO