RTL8201CL-VD datasheet(25/39 Pages) REALTEK

Part #	RTL8201CL-VD

Description	SINGLE-CHIP/SINGLE-PORT 10/100M FAST ETHERNET PHYCEIVER

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Manufacturer	REALTEK [Realtek Semiconductor Corp.]

Direct Link	https://www.realtek.com/en/

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RTL8201CL

Datasheet

Single-Chip/Port 10/100 Fast Ethernet PHYceiver

19

Track ID: JATR-1076-21 Rev. 1.24

7.5. LED and PHY Address Configuration

In order to reduce the pin count on the RTL8201CL, the LED pins are duplexed with the PHY address

pins. Because 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 5 (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 (ex 5.1KΩ). If no LED indications are needed, the components of the LED path

(LED+510Ω) can be removed.

PAD[0:4]/

LED[0:4]

PAD[0:4]/

LED[0:4]

VCC

LED

510 ohm

5.1K ohm

LED

5.1K ohm

510 ohm

PHY Address[:] = Logical 1

PHY Address[:] = Logical 0

LED Indication = Active low

LED Indication = Active High

Figure 5. LED and PHY Address Configuration

Table 27. LED Definitions

LED

LED Definitions

LED0

Link

LED1

Full Duplex

LED2

[CL LED Mode]10-Activity

LED3

[CL LED Mode]Fiber/100-Activity

LED4

Collision

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RTL8201CL-VD Datasheet(PDF) 25 Page - Realtek Semiconductor Corp.

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