RTL8019AS 데이터 시트보기 (PDF) - Realtek Semiconductor

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RTL8019AS

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

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

5.2. Group 2: Plug and Play (PnP) Registers

Auto-configuration Ports

Three 8-bit I/O ports are defined for the PnP read/write operations. They are called Auto-

configuration ports and are listed below.

Port Name

ADDRESS

WRITE_DATA

READ_DATA

Type

W

W

R

Location

279H (Printer status port)

A79H (Printer status port + 800H)

Relocatable in range 200H to 3FFH

The Plug and Play registers are accessed by first writing the address of the desired register, which

is called "Register Index" in the following paragraph, to the ADDRESS port, followed by a read

of data from the READ_DATA port or a write of data to the WRITE_DATA port. A write to the

ADDRESS port may be followed by any number of WRITE_DATA or READ_DATA accesses to

the same indexed register without the need to write to the ADDRESS port before each access.

The Address port is also the write destination of the initiation key, which will be described later.

Plug and Play Registers

The Plug and Play registers may be divided into card registers and logical device registers.

According to the Plug and Play specification, a PnP card may contain more than one logical

devices. The card registers are unique for each card. However, the logical device registers are

repeated for each logical device on the card. Furthermore, all card registers are card control

registers, while the logical device registers can be divided into logical device control registers and

configuration registers. Although an RTL8019AS card contains only one logical device, the

following paragraph still depicts the Plug and Play registers by the same PnP categorizing method.

p.s. Those registers or bits not mentioned below are all read only with value=0.

8019AS.doc

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2001-04-02

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