
Copyright
Cirrus Logic, Inc. 1997
(All Rights Reserved)
CS8920A
Advanced Product Databook
&U\VWDO/$1
TM
ISA
Plug-and-Play Ethernet
Controller
FEATURES
I
Single-Chip IEEE 802.3 Ethernet Controller with
Direct ISA-Bus Interface
I
Implements Industry-Standard Plug and Play
I
Full Duplex Operation
I
Auto-Negotiation of Full and Half duplex Modes
I
Recognizes Received Magic Packet Frames and
Requests the Processor to Power Up
I
Supported by Complete Family of Device Drivers
I
Efficient PacketPage Architecture Operates in
I/O and Memory Space, and as DMA Slave
I
On-Chip RAM Buffers Transmit & Receive Frames
I
10BASE-T Port with Internal Analog Filters
I
AUI Port for 10BASE2, 10BASE5 and 10BASE-F
I
Programmable Receive Features:
— StreamTransfer
for Reduced CPU Overhead
— Auto-Switch Between DMA and On-Chip Memory
— Early Interrupts for Frame Pre-Processing
I
Four LED Drivers for Link Status, Full Duplex, and
LAN Activity
I
Small 144-pin TQFP package, and minimal exter-
nal components (transformer, crystal and
optional EEPROM)
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
architecture automatically adapts to changing net-
work traffic patterns and available system
resources. The result is increased system efficien-
cy and minimized CPU overhead.
unique
PacketPage
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.
ORDERING INFORMATION
Contact Cirrus to check on the availability of CS8920A
for use in ISA form-factor adapter-card applications.
CS8920A-CQ
0 to 70é C
CDK8920A
144-pin TQFP
Developer's Kit
EEPROM
RJ-45
10BASE-T
Attachment
Unit
Interface
(AUI)
20 MHz
XTAL
CS8920 ISA Ethernet Controller
I
S
A
ISA
Bus
Logic
&
Plug
and
Play
EEPROM
Control
RAM
Memory
Manager
802.3
MAC
Engine
and Auto
Negotiation
LED
Control
Clock
Power
Manager
10BASE-T
RX Filters &
Receiver
AUI
Receiver
AUI
Transmitter
AUI
Collision
10BASE-T
TX Filters &
Transmitter
Encoder/
Decoder
&
PLL
SEP ‘97
DS238PP2
Crystal LAN is a trademark of Cirrus Logic, Inc.
Magic Packet is a trademark of Advanced Micro Devices, Inc.