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RTL8211E-VL-CG Datasheet(PDF) 37 Page - Realtek Semiconductor Corp.

Part No. RTL8211E-VL-CG
Description  INTEGRATED 10/100/1000M ETHERNET TRANSCEIVER
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Maker  REALTEK [Realtek Semiconductor Corp.]
Homepage  https://www.realtek.com/en/
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RTL8211E-VL-CG Datasheet(HTML) 37 Page - Realtek Semiconductor Corp.

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RTL8211E/RTL8211EG
Datasheet
Integrated 10/100/1000M Ethernet Transceiver
29
Track ID: JATR-2265-11 Rev. 1.4
7.15. Power
The RTL8211E/RTL8211EG implements a voltage regulator to generate operating power. The system
vendor needs to supply a 3.3V, 1A steady power source. The RTL8211E/RTL8211EG converts the 3.3V
steady power source to 1.05V via a switching regulator.
Another possible implementation is to use an external regulator to generate 1.0V. Be sure that the regulator
meets the required current rate (0.95V~1.09V).
The RTL8211E/RTL8211EG implements an option for the RGMII/GMII power pins. The standard I/O
voltage of the RGMII/GMII interface is 3.3V, with support for 2.5V to lower EMI. The 2.5V power source
for RGMII is from an external regulator.
7.16. PHY Reset (Hardware Reset)
The RTL8211E/EG has a PHYRSTB pin to reset the chip. For a complete PHY reset, this pin must be
asserted low for at least 10ms (Tgap in Figure 10) for the internal regulator. Then wait for a further 30ms
before accessing the PHY register. All registers will return to default values after a hardware reset. Refer to
the RTL8211xx-xx_Power_Sequence_App_Note for more detailed information.
Tgap
(10ms)
1.0V
PHYRSTB
Wait 30ms before accessing
the PHY register
Figure 10. PHY Reset Timing


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