RTL8201 datasheet(6/29 Pages) ETC

Part #	RTL8201

Description	REALTEK SINGLE CHIP SINGLE PORT 10/100M FAST ETHERNET PHYCEIVER RTL8201BL

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RTL8201BL

2002-03-29

Rev.1.2

6

5.3 Clock Interface

Symbol

Type

Pin No.

Description

X2

O

47

25MHz Crystal Output: This pin provides the 25MHz crystal output. It

must be left open when X1 is driven with an external 25MHz oscillator.

X1

I

46

25MHz Crystal Input: This pin provides the 25MHz crystal input. If a

25MHz oscillator is used, connect X1 to the oscillator’s output. Refer to

section 8.3 to obtain clock source specifications.

5.4 100Mbps Network Interface

Symbol

Type

Pin No.

Description

TPTX+

TPTX-

O

34

33

Transmit Output: Differential pair shared by 100Base-TX, 100Base-FX and

10Base-T modes. When configured as 100Base-TX, output is an MLT-3

encoded waveform. When configured as 100Base-FX, the output is

pseudo-ECL level.

RTSET

I

28

Transmit Bias Resistor Connection: This pin should be pulled to GND by

a 5.9KΩ (1%) resistor to define driving current for transmit DAC. The

resistance value may be changed, depending on experimental results of the

RTL8201BL.

TPRX+

TPRX-

I

31

30

Receive Input: Differential pair shared by 100Base-TX, 100Base-FX, and

10Base-T modes.

5.5 Device Configuration Interface

Symbol

Type

Pin No.

Description

ISOLATE

I

43

Set high to isolate the RTL8201BL from the MAC. This will also isolate the

MDC/MDIO management interface. In this mode, the power consumption is

minimum. This pin can be directly connected to GND or VCC.

RPTR

I

40

Set high to put the RTL8201BL into repeater mode. This pin can be directly

connected to GND or VCC.

SPEED

LI

39

This pin is latched to input during a power on or reset condition. Set high to

put the RTL8201BL into 100Mbps operation. This pin can be directly connected

to GND or VCC.

DUPLEX

LI

38

This pin is latched to input during a power on or reset condition. Set high to

enable full duplex. This pin can be directly connected to GND or VCC.

ANE

LI

37

This pin is latched to input during a power on or reset condition. Set high to

enable Auto-negotiation mode, set low to force mode. This pin can be directly

connected to GND or VCC.

LDPS

I

41

Set high to put the RTL8201BL into LDPS mode. This pin can be directly

connected to GND or VCC. Refer to Section 7.7 for more information.

MII/SNIB/

RTT3(test)

LI/O

44

This pin is latched to input during a power on or reset condition. Pull high to

set the RTL8201BL into MII mode operation. Set low for SNI mode. This pin

can be directly connected to GND or VCC. In test mode, this pin is an output pin and

redefined as RTT3

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