CS8900A
Crystal LAN™ ISA Ethernet Controller
(2.0 sq. in.)
20 MHz
XTAL
EEPROM
I
S
A
CS8900A
RJ-45
10BASE-T
Figure 1. Complete Ethernet Motherboard Solution
tive portable and desktop PCs. Motherboard design gineers to design Ethernet solutions that meet their
options include:
particular system requirements. Adapter card de-
sign options include:
•
An EEPROM can be used to store node-specif-
ic information, such as the Ethernet Individual
Address and node configuration.
•
A Boot PROM can be added to support diskless
applications.
•
The 20 MHz crystal oscillator may be replaced
by a 20 MHz clock signal.
•
The 10BASE-T transmitter and receiver im-
pedance can be adjusted to support 100, 120, or
150 Ohm twisted pair cables.
1.2.2 Ethernet Adapter Cards
•
•
An external Latchable-Address-bus decode cir-
cuit can be added to operate the CS8900A in
Upper-Memory space.
The CS8900A’s highly efficient PacketPage archi-
tecture, with StreamTransfer™ and Auto-Switch
DMA options, make it an excellent choice for high-
performance, low-cost ISA adapter cards
(Figure 2). The CS8900A’s wide range of configu-
ration options and performance features allow en-
On-chip LED ports can be used for either op-
tional LEDs, or as programmable outputs.
LED
RJ-45
20 MHz
XTAL
EEPROM
’245
Attachment
Unit
CS8900A
Interface
(AUI)
Boot PROM
Figure 2. Full-Featured ISA Adapter Solution
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