Gigabit Ethernet
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX DG-10931-001_v0.1 | 38
Figure 8-2. Gigabit Ethernet Magnetics and RJ45 Connections
(J8) T XD3
-
(J7) T XD3+
(J6) T XD1-
(J5) T XD2-
(J4) T XD2+
(J3) T XD1+
(J2) T XD0-
(J1) T XD0+
22nF
each
75Ω
each
J1
J2
J3
J6
J4
J5
J7
J8
M D0 +
M D0 -
M D1 +
M D1 -
M D2 +
M D2 -
M D3 +
M D3 -
M CT
GRN+
GRN–
YE L+
YE L–
VC1
VC2
VC3
VC4
0.1uF
GBE_MDI0_P
GBE_MDI0_N
GBE_MDI1_P
GBE_MDI1_N
GBE_MDI2_P
GBE_MDI2_N
GBE_MDI3_P
GBE_MDI3_N
11 0Ω
11 0Ω
GBE_LED_LINK
GBE_LED_ACT
1000pF
VDD_3V 3_SYS
100pF
0. 05Ω
0. 05Ω
0. 05Ω
0. 05Ω
0. 05Ω
0. 05Ω
Pla ce 0.0 5Ω resistors &
capacitor around
chassis GND shape
PO E_VC1
PO E_VC2
PO E_VC3
PO E_VC4
Table 8-2. Ethernet MDI Interface Signal Routing Requirements
Reference plane GND
Trace impedance
Diff pair / Single Ended
100 / 50
Ω
±15%. Differential impedance target is 100Ω.
90Ω can be used if 100Ω is not achievable
Min trace spacing (pair-pair) 0.763 mm
Max trace length/delay 109 (690) mm (ps)
Max within pair (intra-pair) skew 0.15 (1) mm (ps)
Number of vias minimum Ideally there should be no vias, but if required
for breakout to Ethernet controller or
magnetics, keep very close to either device.
Notes: NVIDIA Orin does not support delay or skewing of clock vs. data. This must be enabled in the PHY.
Table 8-3. Ethernet Signal Connections
GBE_MDI[3:0]_N/P DIFF
I/O
Gigabit Ethernet MDI IF Pairs: Connect to Magnetics -/+ pins
GBE_LED_LINK O
110Ω (minimum) series
resistor
Gigabit Ethernet Link LED: Connect to green LED cathode on RJ45
connector. Anode connected to VDD_3V3_SYS
GBE_LED_ACT O 110Ω (minimum) series
resistor
Gigabit Ethernet Activity LED: Connect to yellow LED cathode on
RJ45 connector. Anode connected to VDD_3V3_SYS
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