Smart Module Series
SG368Z_Series_Hardware_Design 79 / 113
RGMII_TX and RGMII_RX are all high-speed signal traces. In PCB design, control the characteristic
impedance of these traces as 50 Ω, shield them and do not cross them with other traces. It is
recommended to route these traces on the inner layer of PCB and keep their lengths the same.
Additionally, RGMII_RX_CLK, RGMII_TX_CLK, RGMII_MCLK and RGMII_REFCLKOUT need separate
ground shielding.
Layout guidelines:
⚫ Control the differential impedance to 50 Ω ±10 % and shield them.
⚫ The trace length difference among RGMII_TX0, RGMII_TX1, RGMII_TX2, RGMII_TX3,
RGMII_TX_CTL and RGMII_TX_CLK should not exceed 3 mm.
⚫ The trace length difference among RGMII_RX0, RGMII_RX1, RGMII_RX2, RGMII_RX3,
RGMII_RX_CTL and RGMII_RX_CLK should not exceed 3 mm.
⚫ The total trace length of each RGMII signal should not exceed 125 mm.
⚫ Clearance between RGMII signal traces should be greater than or equal to 2 times the trace width
and the clearance between RGMII signal traces and other signal traces should be greater than or
equal to 3 times the trace width.
Table 33: RGMII Interface Trace Length Inside the Module (Unit: mm)
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