CS8900A
Crystal LAN™ Ethernet Controller
(2.0 sq. in.)
20 M H z
X TA L
EEPR OM
I
RJ-45
10B AS E-T
S
A
CS8900A
Figure 1. Complete Ethernet Motherboard Solution
high level of integration allow System Engi-
neers to design a complete Ethernet circuit
that occupies as little as 1.5 square inches of
PCB area (Figure 1). In addition, the
CS8900A’s power-saving features and CMOS
design make it a perfect fit for power-sensitive
portable and desktop PCs. Motherboard de-
sign options include:
Switch DMA options, make it an excellent
choice for high-performance, low-cost ISA
adapter cards (Figure 2). The CS8900A’s wide
range of configuration options and perfor-
mance features allow engineers to design
Ethernet solutions that meet their particular
system requirements. Adapter card design op-
tions include:
•
An EEPROM can be used to store node-
specific information, such as the Ethernet
Individual Address and node configuration.
•
A Boot PROM can be added to support
diskless applications.
•
The 10BASE-T transmitter and receiver
impedance can be adjusted to support 100,
120, or 150 Ohm twisted pair cables.
•
The 20 MHz crystal oscillator may be re-
placed by a 20 MHz clock signal.
•
An external Latchable-Address-bus de-
code circuit can be added to operate the
CS8900A in Upper-Memory space.
1.2.2 Ethernet Adapter Cards
The CS8900A’s highly efficient PacketPage
architecture, with StreamTransfer™ and Auto-
LED
RJ -45
20 MH z
XTAL
E EPR O M
'245
A tta c h m en t
U n it
CS8900A
In te rfa c e
(A U I)
Boot PROM
Figure 2. Full-Featured ISA Adapter Solution
CIRRUS LOGIC PRODUCT DATASHEET
DS271F4
9
CIRRUS [ CIRRUS LOGIC ]
