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RTL8019AS

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

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

6. Functional Descriptions

6.1. RTL8019AS Configuration Modes

The RTL8019AS supports 3 configuration modes: jumper, RT jumperless, and PnP.

JP Pin PnP Pin

H

H

L

L

H

L

L

L

L

9346 Content

PNP ACTIVEB

x

x

x

a (a=0or1)

1

a (a=0or1)

0

x

P.S. "x" denotes don't care.

Mode

Jumper

PnP

PnP

RT jmpless

CONFIG0

JP

PNPJP

1

1

0

0

1

0

0

0

0

CONFIG3

PNP

ACTIVEB

0

0

1

a

1

a

0

0

The RTL8019AS's resource configuration informations such as I/O base address, BROM memory

base address, and interrupt request line, etc., are stored in the CONFIG3-0 registers in Group1

Page3 as well as the PnP logical device configuration registers. Their power-up default values may

come from the states of jumper pins in jumper mode or the contents of 9346 in PnP and RT

jumperless mode. Their values can be modified by software via the logical device configuration

registers in all 3 modes. The update values will be recorded to the CONFIG3-0 registers, too. This

new configuration is only valid temporarily and will be lost after an auto-load command, an active

RSTDRV, or PC power off . Permanent changes of configuration must be done by changing the

jumper states or the contents of 9346. Note that the BROM size can not be modified temporarily.

The Plug and Play logic can work in all the three configuration modes except that an RT defined

initiation key, named RT initiation key, should be used instead of the PnP initiation key. In other

words, the RT initiation key is supported in all configuration modes while the PnP initiation key is

only supported in the PnP mode. By using the RT initiation key, the software can put RTL8019AS

to the PnP Config state and access the logical device configuration registers even in the jumper

and RT jumperless modes.

Power up default ACTIVE state

In RTL8019, the ACTIVEB bit in 93C46 decides the power-up adapter status even in RT jumpless

mode. In the standard application when BROM is not enabled, the adapter should be power up

inactive in PnP mode and active in RT jumperless mode. However RTL8019's PnP jumper only

decides the jumperless mode. The adapter's "ACTIVE" status is not changed properly at the same

time when the user changes the PnP jumper state. This causes an application inconsistence when

PnP jumper is to be used.

In RTL8019AS, we change RTL8019's original specification into:

The ACTIVEB bit in 9346 is ignored when RTL8019AS is in jumper or RT jumperless mode.

The adapter's power-up status is always "ACTIVE" in RT jumperless mode. However, the

active status still can be changed via the PnP Activate register.

8019AS.doc

27

2001-04-02

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