RTL8201 Просмотр технического описания (PDF) - Realtek Semiconductor

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RTL8201

REALTEK SINGLE CHIP SINGLE PORT 10/100MBPS FAST ETHERNET PHYCEIVER

Realtek Semiconductor 

RTL8201(L)

7.5 LED and PHY Address Configuration

In order to reduce the pin count on the RTL8201, the LED pins are duplexed with the PHY address pin. 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,

if a given PHYAD input is pulled low then the corresponding output will be configured as an active high driver.

VDD33

R18

R18

LED0

R19

5.1K D1

150

LED

R20

LED0

D1

5.1K R19

LED

150

R20

VDD33

LED1

D2

5.1K R21

LED

150

R22

LED1

R21

5.1K D2

150

LED

R22

LED2

D3

5.1K

R23

LED

R24

150

LED2

D3

5.1K

R23

LED

R24

150

LED3

D4

5.1K

R25

LED

R26

150

LED3

D4

5.1K

R25

LED

R26

150

LED4

D5

5.1K R27

LED

150

GND

LED4

D5

5.1K R27

LED

150

GND

Above are examples of LED and PHY address configurations. In the left figure, the PHY address is set to (00001b=01h). In

the right figure, the PHY address is set to (00010b=02h). In the above two PHY address designs, all useable LEDs have been

connected. It is not necessary to utilize all LED functions when designing for the RTL8201.

The LEDs are defined in the following table.

LED

LED0

LED1

LED2

LED3

LED4

Description

Link

Full Duplex

Link 10-Activity

Link 100-Activity

Collision

7.6 Serial Network Interface

The RTL8201(L) also supports the traditional 7-wire serial interface to cooperate with legacy MACs or embedded systems. To

setup for this mode of operation, pull the MII/SNIB pin low and by doing so, the RTL8201(L) will ignore the setup of the

ANE and SPEED pins. In this mode, the RTL8201(L) will set the default to work in 10Mbps and Half-duplex mode. But the

RTL8201(L) may also support full duplex mode operation if the DUPLEX pin has been pulled high.

This interface consists of 10Mbps transmit and receive clock generated by PHY, 10Mbps transmit and receive serial data,

transmit enable, collision detect, and carry sense signals.

2002-01-18

20

Rev.1.04

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

http://www.cornelius-consult.de

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