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RTL8019AS

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

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

5.2.1. Card Control Registers

Index

Name

00H Set RD_DATA port

01H Serial Isolation

02H Config Control

03H Wake[CSN]

04H Resource Data

05H Status

06H Card Select Number

(CSN)

07H Logical Device

Number

Type

W

R

W

Definition

The location of the READ_DATA port is determined by writing to

this register. Bits[7:0] become ISA I/O read port address bits[9:2].

Address bits[1:0] of the READ_DATA port are always 1.

A read to this register causes a PnP card in the Isolation state to

compare one bit of the card's serial ID. This process will be described

in more details in section 6.

Bit[0] - Reset command

Setting this bit will reset all logical devices and restore configuration

registers to their power-up values.

The CSN is preserved.

Bit[1] - Wait for Key command

Setting this bit makes the PnP card return to the

Wait for Key state. The CSN is preserved.

Bit[2] - PnP Reset CSN command

Setting this bit will reset the card's CSN to 0.

Both the CSN (index 06H) and CSNSAV (index F5H) registers are

reset.

Note that the hardware will automatically clear the bits and there is no

need for software to clear them.

W A write to this register will cause all cards that have a CSN that

matches the write data[7:0] to go from the Sleep state to either the

Isolation state if the write data for this command is zero or the Config

state if the write data is not zero.

R A read from this register reads the next byte of resource data. The

Status register must be polled until bit[0] is set before this register

may be read.

R Bit[0] when set indicates it is okay to read the next data byte from the

Resource Data register.

R/W A write to this register sets a card's CSN. The CSN is a value uniquely

assigned to each ISA PnP card after the serial identification process so

that each card may be individually selected during a Wake[CSN]

command. The CSN value written to this register will also be recorded

to the CSNSAV register located at PnP register index F5H and Group

1 Page3 offset 08H.

R 00H (Only one logical device in RTL8019AS).

8019AS.doc

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2001-04-02

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