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參數(shù)資料
| 型號： | CDK8920A |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER |
| 中文描述： | 水晶藍(lán)的ISA即插即用，即插即用以太網(wǎng)控制器 |
| 文件頁數(shù)： | 5/144頁 |
| 文件大小： | 1229K |
| 代理商： | CDK8920A |
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The AUI port provides a direct interface to
10BASE-2, 10BASE-5 and 10BASE-FL net-
works, and is capable of driving a full 50-meter
AUI cable.
1.2
System Applications
The CS8920A is designed to work well in either
motherboard or adapter applications.
Motherboard LANs
The CS8920A requires the minimum number of
external components needed for an Ethernet
node, allowing a complete Ethernet circuit that
occupies as little as 2.0 square inches of PCB
area (Figure 1.1). In addition, the CS8920A’s
power-saving features make it a perfect fit for
power-sensitive portable and desktop PCs. Moth-
erboard design options include:
The EEPROM, used to store node-specific
information, such as the Ethernet Individual
Address, can be eliminated by storing infor-
mation in the system CMOS.
The 20 MHz crystal oscillator may be re-
placed by a 20 MHz clock signal.
Note: while operation of the CS8920A is possi-
ble without the use of an attached EEPROM,
special design considerations are required. Fur-
thermore, some of the CS8920A functions, such
as Plug and Play capabilities and wakeup frame
recognition are not possible without an attached
EEPROM. Please contact Crystal’s CS8920A
technical support for more information on the
use of the CS8920A without an attached
EEPROM.
Plug-and-Play Ethernet Adapter Cards
The CS8920A’s highly efficient StreamTrans-
fer
TM
and Auto-Switch DMA options, make it
an excellent choice for high-performance, low-
cost, ISA adapter cards (Fig. 1.2). The
CS8920A’s wide range of configuration options,
listed below, allow engineers to design Ethernet
solutions that meets their particular system re-
quirements.
A Boot PROM can be added to support disk-
less applications.
The 10BASE-T transmitter and receiver im-
pedance can be adjusted to support 100, 120,
or
150
twisted pair cables.
On-chip LED ports can be used for either
optional LEDs, or as programmable outputs.
1.3
Key Features and Benefits
Very Low Cost
The CS8920A is designed to provide the lowest-
cost Ethernet solutions available for ISA desktop
motherboards, portable motherboards, and
adapter cards. Cost-saving features include:
Integrated RAM eliminates the need for ex-
pensive external memory chips.
RJ-45
10BASE-T
CS8920A
I
S
A
EEPROM2XTAL
(2.0 sq. in.)
Figure 1.1. Complete Ethernet Motherboard Solution
CS8920A
DS238PP1
5
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