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DM560P

V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set

Davicom Semiconductor, Inc. 

DM560P

V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set

Plug and Play (PnP) Module

Auto-configuration Ports

Three 8-bit I/O ports are defined for Plug and Play

read/write operations. They are called Auto-

configuration ports as listed below.

The Plug and Play Register could be directly accessed

without the need 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.

Port Type

Location

ADDRESS W 0279H

(Printer status port)

WRITE_ W 0A79H

DATA

(Printer status port + 0800H)

READ_ R Relocatable in range

DATA

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.

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 DM6583A 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.

Card Control Registers

Index

00H

01H

02H

03H

Name

Set RD_DATA port

Serial Isolation

Config Control

Wake [CSN]

Type

Definition

W 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.

R 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.

W 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.

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 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 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.

05H

Status

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

Resource Data Register.

06H Card Select Number R/W A write to this register sets a card CSN. After a serial identification process,

(CSN)

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.

16

Preliminary

Version: DM560P-DS-P07

August 11, 2000

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