LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 64 / 130
Figure 28: Reference Circuit of SGMII Interface with PHY AR8033 Application
In order to enhance the reliability and availability in customers’ applications, please follow the criteria
below in the Ethernet PHY circuit design:
Keep SGMII data and control signals away from other sensitive circuits/signals such as RF circuits,
analog signals, etc., as well as noisy signals such as clock signals, DC-DC signals, etc.
Keep the maximum trace length less than 10-inch and keep skew on the differential pairs less than
20mil.
The differential impedance of SGMII data trace is 100
Ω
±10%, and the reference ground of the area
should be complete.
Make sure the trace spacing between SGMII RX and TX is at least 3 times of the trace width, and the
same to the adjacent signal traces.
SGMII interface is not supported on ThreadX modules.
3.17. Network Status Indication
The network indication pins can be used to drive network status indication LEDs. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe the pin definition and
logic level changes in different network status.
NOTE
