AM79C930 datasheet(68/161 Pages) AMD

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P R E L I M I N A R Y

Am79C930

ISA Plug and Play Register Set — The Am79C930 de-

vice fully supports the ISA Plug and Play specification,

revision 1.0a.

The Am79C930 device supports the Plug and Play

Auto-configuration

scheme.

The

Plug

and

Play

ADDRESS Auto-configuration Port, WRITE_DATA

Auto-configuration Port, and READ_DATA Auto-con-

figuration Port are all supported and are mapped into

ISA I/O space as follows:

Am79C930 Device ISA Plug And Play Mode Supported Auto-Configuration Ports

Port Name

ISA (IEEE P996) I/O Address

Access

ADDRESS

0279h

Write only

WRITE_DATA

0A79h

Write only

READ_DATA

0203h – 03FFh (relocatable)

Read only

The location of the READ_DATA Auto-configuration

port is only fixed within the range 0203h–03FFh. The

exact location is determined by a write to the appropriate

Plug

and

Play

Auto-configuration

port

(Set

READ_DATA Auto-configuration port).

The WRITE_DATA port and the READ_DATA port are

not active until the Initiation Key has been sent to the

Am79C930 device through the ADDRESS port. This be-

havior conforms to the requirements of the Plug and

Play specification.

The Am79C930 device implements the four Plug and

Play configuration states: “Wait for Key,” “Sleep,”

Isolation,” and “Config.”

All Plug and Play ports are 8 bits in width.

To fully support the Plug and Play mechanism, the fol-

lowing additional register locations are defined within

the Am79C930 device. Except for the Resource Data

BIU and are accessed indirectly, through setting the

Plug and Play Port Address in the Plug and Play

ADDRESS port (location I/O 0279h) and then by ac-

cessing

either

the

WRITE_DATA

port

the

READ_DATA port. The 80188 embedded core does not

have access to the registers in the following table.

AM79C930 Datasheet(PDF) 68 Page - Advanced Micro Devices

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