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RTL8211E-VL-CG Datasheet(PDF) 25 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) 25 Page - Realtek Semiconductor Corp.

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RTL8211E/RTL8211EG
Datasheet
Integrated 10/100/1000M Ethernet Transceiver
17
Track ID: JATR-2265-11 Rev. 1.4
7.8. LED and PHY Address Configuration
In order to reduce the pin count on the RTL8211E/RTL8211EG, the LED pins are duplexed with the PHY
address pins. As the PHYAD strap options share the LED output pins, the external combinations required
for strapping and LED usage must be considered in order to avoid contention. Specifically, when the LED
outputs are used to drive LEDs directly, the active state of each output driver is dependent on the logic level
sampled by the corresponding PHYAD input upon power-up/reset. For example, as Figure 7 (left-side)
shows, if a given PHYAD input is resistively pulled high then the corresponding output will be configured
as an active low driver. On the right side, we can see that if a given PHYAD input is resistively pulled low
then the corresponding output will be configured as an active high driver. The PHY address configuration
pins should not be connected to GND or VCC directly, but must be pulled high or low through a resistor
(e.g., 4.7K
Ω). If no LED indications are needed, the components of the LED path (LED+510Ω) can be
removed.
PHY Address[:]=Logical 1
PHY Address[:]=Logical 0
RXDLY=Logical 1
RXDLY=Logical 0
LED Indication=Active low
LED Indication=Active High
Figure 7. LED and PHY Address Configuration
7.9. Green Ethernet (1000/100Mbps Mode Only)
7.9.1.
Cable Length Power Saving
In 1000/100Mbps mode the RTL8211E/RTL8211EG provides dynamic detection of cable length and
dynamic adjustment of power required for the detected cable length. This feature provides intermediate
performance with minimum power consumption.
7.9.2.
Register Setting
Follow the register settings below to disable Green Ethernet (Default is ‘Enabled’)
Write Reg31, Data=0x0003 (page3)
Write Reg25, Data=0x3246
Write Reg31, Data=0x0000 (page0)


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