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Parameter
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 &
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 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
SDMMC_CLK
SDMMC_CMD
SDMMC_D[3:0]
NVIDIA Jetson TX2 NX
Requirement
4x / 3x
16 (100)
139 (876)
16 (100)
83 (521)
14 (87.5)
2 (12.5)
Type
Termination
O
I/O
I/O
Units
Notes
dielectric
mm (ps)
See Note 3
mm (ps)
Description
SD Card / SDIO Clock: Connect to CLK pin of device.
SD Card / SDIO Command: Connect to CMD pin of device
SD Card / SDIO Data: Connect to Data pins of device
SD Card and SDIO
DG-10141-001_v1.1 | 53
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