CS8920 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS8920 Datasheet PDF : 66 Pages
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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.
AN84REV1
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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