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RTL8019AS

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

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

6.2.2. Isolation Protocol

A simple algorithm is used to isolate each Plug and Play card. This algorithm uses the signals on the ISA

bus and requires lock-step operation between the Plug and Play hardware and the isolation software.

State

Isolation

Read from serial isolation register

Get one bit from serial identifier

Drive "55H"

on SD[7:0]

yes

ID bit="1H"

no

Leave SD [7:0]

in high-impedance

no

SD[1:0]="01"

yes

Wait for next read from serial isolation register

Drive

"AAH" on

SD[7:0]

Leave SD [7:0]

in high impedance

After I/O read completes

fetch next ID bit from

serial identifier

no

SD[1:0]="10"

yes ID=0

other card ID=1

no

Read all 72 bits

from serial

identifier

yes

State

Sleep

One card

isolated

Figure 1. Plug and Play ISA Card Isolation Algorithm

8019AS.doc

30

2001-04-02

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