DM6381F datasheet(14/40 Pages) ETC

14 / 40 page

DM336P

V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set

Final

Version: DM336P-DS-F02

August 15, 2000

5. Plug and Play (PnP) Module

a. Auto-configuration Ports

Three 8-bit I/O ports are defined for the PnP

read/write operations. They are called Auto-

configuration ports as listed below.

Port

Type

Location

ADDRESS

0279H

(Printer status port)

WRITE_

DATA

0A79H

(Printer status port + 0800H)

READ_

DATA

Relocatable in range

0203H to 03FFH

To access the Plug and Play Register, a host should

follow this procedure: Write a target register address

(Register Index), choose a port (WRITE_DATA or

READ_DATA), then enter data. But Plug & Play

to write to the ADDRESS port before each access.

The ADDESS 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 & Play specification, if a PnP

card contains more than one logical device, there are

one more copies of Logical Device Registers in the

PnP card. However, the DM6383A contains only one

logical device, the Card Register and Logical Device

Registers are unique for each card. Those PnP

registers or bits not defined below are all read with

value = 0.

(1) Card Control Registers

Index

Name

Type

Definition

00H

Set RD_DATA port

The location of the READ_DATA port is determined by writing to this

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

01H

Serial Isolation

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

one bit of the card serial ID. This process is described in more detail in the

next section.

02H

Config Control

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 CSN to 0. Note that the hardware will

automatically clear the bits without any need for software to clear them.

03H

Wake [CSN]

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 1) Isolation

state if the write data for this command is zero, or 2) Configuration state if

the write data is not zero.

04H

Resource Data

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

05H

Status

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

Resource Data Register.

06H

Card Select Number

(CSN)

R/W A write to this register sets a card CSN. After a serial identification

process, the CSN value (CSN) is uniquely assigned to each ISA PnP card

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

command.

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