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 

SPECIFICATION

RTL8019AS

BROM size

16K

32K

64K

BA14

high

SA14

SA14

BA15

high

high

SA15

CONFIG3: RTL8019AS Configuration Register 3 (06H; Type=R except Bit[2:1]=R/W)

Bit

Symbol

Description

7

PNP

This bit is negligible in jumper mode. In jumperless mode it, when set, indicates the

RTL8019AS is operating in Plug and Play mode. This bit is set when the PNP pin is

high or the PNP bit in 9346 is set in jumperless mode.

6

FUDUP When this bit is set, RTL8019AS is set to the full-duplex mode which enables

simultaneously transmission and reception on the twisted-pair link to a full-duplex

Ethernet switching hub. This feature not only increases the channel bandwidth from 10

to 20 Mbps but also avoids the performance degrading problem due to the channel

contention characteristics of the Ethernet CSMA/CD protocol.

5-4

LEDS1-0 These two bits select the outputs to LED2-0 pins.

LEDS0

0

1

LED0 Pin

LED_COL

LED_LINK

LEDS1

0

1

LED1 Pin

LED_RX

LED_CRS

LED2 Pin

LED_TX

MCSB

Please refer to section 6.5 for the behavior of LEDs.

The MCSB signal is defined to put the local buffer SRAM into standby mode while

DMA is not in progress and thus save powers.

3

-

Reserved. Must not write a 1 to this bit.

2

SLEEP This bit, when set, puts RTL8019AS into sleep mode.

In sleep mode, all LED signals (P.S. MCSB is not an LED signal) except LEDBNC are

forced high to turn off the LEDs. The RTL8019AS still handles the network

transmission and reception like in normal mode. The LEDBNC is not affected by this

bit.

This bit's power-up initial value is 0 and can be modified by software when

EEM1=EEM0=1.

1

PWRDN This bit , when set, puts RTL8019AS into power down mode.

RTL8019AS supports two kinds of power down modes, which is selected by the

contents of the HLTCLK register:

(1) mode 1: power down with clock running

(2) mode 2: power down with clock halted

In both power down modes, the RTL8019AS's serial network interface and transceiver

are turned off. All network activities are ignored.

All LED signals except LEDBNC are forced high. The LEDBNC is forced low to

disable the DC convertor for coaxial transceiver.

In power down mode2, the RTL8019AS stops its internal clock for minimal power

consumption. Registers except HLTCLK are typically not accessible in this mode.

This bit's initial value comes from 9346 and can be modified if EEM1=EEM0=1 in

9346CR register.

8019AS.doc

21

2001-04-02

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