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100 Intel

Atom™ processor CE4100 Ref# 420826

Platform Design Guide

Intel Confidential

Figure 8-9. GBE Interface Clock Signal Design Example

Intel® Atom™ processor CE4100

RGMII PHY

(RTL8211b)

25MHz

GBE_REFCLK

1000/100/10

125/25/2.5MHz

125MHz

RGMII: Strapping must be set to use

external clock mode

GBE_TXCLK

RGMII

Intel® Atom™ processor CE4100

RMII PHY

(RTL8201n)

25MHz

GBE_REFCLK

50MHz

Not Used

GBE_TXCLK

RMII

RMII: Strapping is set as internal clock

mode

Note: The Intel

Atom™ processor CE4100 can provide a 50-MHz clock source to RMII PHY

by GBE_TXCLK signal. However, for RGMII PHY support, the Intel

Atom™ processor

CE4100 must obtain an external 125-MHz clock source via GBE_REFCLK

Figure 8-10. GBE TX Interface (except GBE_TXCLK)

Figure 8-11. GBE_TXCLK

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