RTL8208 Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8208

REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER

Realtek Semiconductor 

RTL8208

5.3 Miscellaneous Pins

Pin Name

RESET#

X1

X2

REFCLK

IBREF

VCTRL

Pin

47

114

115

48

118

116

Type

I,

(Pu)

I

O

I/O

A

O

Description

Reset: This is an active low input. To complete the reset function, this

pin must be asserted low for at least 10ms.

25MHz Crystal X1 or 25MHz Oscillator clock input: When X1 is

pulled low, X2 must be floating. REFCLK will then be the chip clock

input.

25MHz Crystal X2

Reference clock:

If X1 is 25MHz active, REFCLK is a 50MHz output.

If X1 is pulled-low (disabled), REFCLK is the clock input as below:

50MHz 100ppm clock input for RMII mode.

125MHz 100ppm clock input for SMII/SS-SMII mode.

Reference Bias Resistor: This pin must be tied to analog ground through

an external 1.96KΩ resistor when using a 1:1 transformer on Tx/Rx.

Voltage control: This pin controls a PNP transistor to generate the

2.5V power supply for VDD and VDDAL pins.

2003/04/04

7

Rev.1.97

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