CS8920A
Advanced Product Databook
FEATURES
s
Single-Chip IEEE 802.3 Ethernet Controller with
Direct ISA-Bus Interface
s
Implements Industry-Standard Plug and Play
s
Full Duplex Operation
s
Auto-Negotiation of Full and Half duplex Modes
s
Recognizes Received Magic Packet™ Frames and
Requests the Processor to Power Up
s
Supported by Complete Family of Device Drivers
s
Efficient PacketPage™ Architecture Operates in
I/O and Memory Space, and as DMA Slave
s
On-Chip RAM Buffers Transmit & Receive Frames
s
10BASE-T Port with Internal Analog Filters
s
AUI Port for 10BASE2, 10BASE5 and 10BASE-F
s
Programmable Receive Features:
— StreamTransfer
™
for Reduced CPU Overhead
— Auto-Switch Between DMA and On-Chip Memory
— Early Interrupts for Frame Pre-Processing
&U\VWDO /$1
TM
ISA
Plug-and-Play Ethernet
Controller
DESCRIPTION
The CS8920A is a low-cost Ethernet LAN Control-
ler optimized for Industry Standard Architecture
(ISA) Personal Computers. Its highly-integrated
design eliminates the need for costly external com-
ponents required by other Ethernet controllers.
In addition to high integration, the CS8920A offers
a broad range of performance features and config-
uration
options.
Its
unique
PacketPage
architecture automatically adapts to changing net-
work traffic patterns and available system
resources. The result is increased system efficien-
cy and minimized CPU overhead.
The CS8920A is available in a thin 144-pin TQFP
package ideally suited for small form-factor, cost-
sensitive Ethernet applications, such as desktop
and portable motherboards. With the CS8920A,
system engineers can design a complete Plug-
and-Play Ethernet circuit that occupies less than
2.0 square inches (14 sq. cm) of board space.
Crystal LAN is a trademark of Cirrus Logic, Inc.
Magic Packet is a trademark of Advanced Micro Devices, Inc.
20 MHz
XTAL
CS8920 ISA Ethernet Controller
LED
Control
RAM
Clock
s
Four LED Drivers for Link Status, Full Duplex, and
LAN Activity
s
Small 144-pin TQFP package, and minimal exter-
nal components (transformer, crystal and
optional EEPROM)
ORDERING INFORMATION
Contact Cirrus to check on the availability of CS8920A
for use in ISA form-factor adapter-card applications.
144-pin TQFP
CS8920A-CQ0 to 70É C
CDK8920A
Developer's Kit
EEPROM
EEPROM
Control
ISA
Bus
Logic
&
Plug
and
Play
Memory
Manager
10BASE-T
RX Filters &
Receiver
10BASE-T
TX Filters &
Transmitter
AUI
Transmitter
AUI
Collision
RJ-45
10BASE-T
I
S
A
Encoder/
Decoder
&
PLL
802.3
MAC
Engine
and Auto
Negotiation
Power
Manager
AUI
Receiver
Attachment
Unit
Interface
(AUI)
SEP ‘97
Copyright
©
Cirrus Logic, Inc. 1997
(All Rights Reserved)
DS238PP2
CIRRUS [ CIRRUS LOGIC ]
