CS8920 datasheet(39/66 Pages) CIRRUS

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AN84REV1

CS8920 Technical Reference Manual

3.2.2.2 Recommended Reset

Configuration Block for a PnP Adapter

The Reset Configuration Block for an

adapter installed in a PnP system should

not assign an IO base address or activate

the adapter from the EEPROM. The

exception to this case is when a

BootPROM is installed on the adapter. If

the CS8920 is a boot device it must be

activated from the Reset Configuration

Block of the EEPROM after each reset.

Addr

Word

Description

00h

A10Ah

PnP enabled, 10 bytes follow

01h

2158h

3 words, start with PacketPage 158h (IA)

02h

0100h

03h

0302h

Individual Address of 000102030405h

04h

0504h

05h

CD00h

Checksum of 12 bytes

Table 3.2. Reset Configuration Block

for PnP System

3.2.2.3 PnP with Automatic Wakeup

Feature Enabled

The CS8920 can be configured to assert an

active-high signal on the EEWAKE pin

(pin 3) when a specific bit pattern is

detected by its receiver circuitry.

This pin can be connected to the system

board’s power management circuitry. Refer

to the CS8920 Data Sheet for more

information on the operation of the wakeup

feature.

To enable the wake-up feature of the

CS8920, the CS8920 must be configured to

receive frames across the ISA bus from the

appropriate LAN media after following a

reset. This requires specifying the media

type, enabling the receiver, and setting the

LineCTL register to enable the wake-up

function. Following is an example Reset

Configuration Block that would enable the

CS8920’s wakeup feature.

Addr

Word

Description

00h

A116h

PnP enabled, 22 bytes follow

01h

2158h

3 words, start with PacketPage 158h (IA)

02h

0100h

03h

0302h

Individual Address of 000102030405h

04h

0504h

05h

0112h

1 word to PacketPage 122h (LineCTL)

06h

8240h

Wakeup Enable, Detect media, RxOK

07h

0104h

1 word to PacketPage 104h (RxCTL)

08h

0D00h

Accept Rx Broadcast, IA, and OK

09h

011Ch

1 word to PPage 11Ch (AutoNegCTL)

0Ah

0100h

Enable Auto-negotiate

0Bh

BC00h

Checksum of 24 bytes

Table 3.3. Reset Configuration Block

for PnP System with Automatic Wakeup

Feature

Note: It is not necessary to configure the

adapter for the transmission of frames from

the Reset Configuration Block.

Furthermore, setting the TxOn bit of the

TxCTL register during the reset cycle will

cause the CS8920 to function improperly.

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