RTL8019AS Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8019AS

Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)

Realtek Semiconductor 

4.4. Medium Interface Pins

No.

Name

64

AUI

54,53

56,55

49,48

CD+,CD-

RX+,RX-

TX+,TX-

59,58

45,46

50

51

TPIN+,

TPIN-

TPOUT+,

TPOUT-

X1

X2

4.5. LED Output Pins

No.

60

Name

LEDBNC

61

62,63

LED0

LED1,LED2

SPECIFICATION

RTL8019AS

Type

I

I

I

O

I

O

I

O

Description

This input is used to detect the usage of an external MAU on

the AUI interface. The input should be driven low for

embedded BNC and high for external MAU. When the input

is high, RTL8019AS sets the AUI bit (bit5) in CONFIG0 and

drives LEDBNC low to disable the BNC. If this pin is not

used, it should be connected to GND such that RTL8019AS

acts like RTL8019. Please refer to section 5.1.2.2. CONFIG0

for more details.

This AUI collision input pair carries the differential collision

input signal from the MAU.

This AUI receive input pair carries the differential receive

input signal from the MAU.

This AUI transmit output pair contains differential line

drivers which send Manchester encoded data to the MAU.

These outputs are source followers and require 270 ohm pull-

down resistors to GND.

This TP input pair receives the 10 Mbits/s differential

Manchester encoded data from the twisted-pair wire.

This pair carries the differential TP transmit output. The

output Manchester encoded signals have been pre-distorted

to prevent overcharge on the twisted-pair media and thus

reduce jitter.

20Mhz crystal or external oscillator input.

Crystal feedback output. This output is used in crystal

connection only. It must be left open when X1 is driven with

an external oscillator.

Type

O

O

O

Description

This pin goes high when RTL8019AS's medium type is set to

10Base2 mode or auto-detect mode with link test failure.

Otherwise, this pin is low. This pin can be used to control the

power of the DC convertor for CX MAU and connected to

an LED to indicate the used medium type.

When LEDS0 bit (in CONFIG3 register of RTL8019AS

Page3) is 0, this pin acts as LED_COL. When LEDS0=1, it

acts as LED_LINK.

When LEDS1 bit (in CONFIG3 register of RTL8019AS

Page3) is 0, these 2 pins act as LED_RX & LED_TX

respectively. When LEDS1=1, these pins act as LED_CRS

& MCSB. Please refer to section 6.5 for details of the

lightening behavior of all LEDs.

8019AS.doc

8

2001-04-02

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