DM9008F datasheet(26/68 Pages) ETC

26 / 68 page

DM9008

ISA/Plug & Play Super Ethernet Contoller

Final

Version :DM9008-DS-F02

June 14, 2000

Functional Description

Plug and Play (PnP) Module

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

Type

Location

ADDRESS

279H (Printer status port)

WRITE DATA

A79H (Printer status prot + 800H)

READ DATA

Relocatable in range 203H to 3FFH

The Plug and Play registers are accessed by first writing the

address of the desired register, which is called the "Register

Index". This can be followed by any number of WRITE_DATA

or READ_DATA accesses to the same indexed register

without any 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 two groups:

card registers and logical device registers. According to the

Plug and Play specification, for each additional device

contained in a PnP card, there should be a corresponding copy

of the logical device register. However, because the DM9008

contains only one logical device, the card registers and logical

device registers are unique for each card. Those PnP registers

or bits not defined in the following table are all read with value

= 0.

DM9008F Datasheet(PDF) 26 Page - List of Unclassifed Manufacturers