CS8904
Crystal LAN™ Quad Ethernet Transceiver
Each of the CS8904 interface ports support 100,
The Link Status LED indicates that there is an
120, and 150 Ω shielded and unshielded cables, and operational link with the remote network device.
automatic receive reverse-polarity detection and
1.3 Key Features and Benefits
correction.
1.3.1 Low Cost, Low Noise, More Features
1.2 System Applications
•
High-performance on-chip 10BASE-T filters
allow designers to use simple isolation trans-
formers instead of more costly filter/transform-
er packages.
The CS8904 is designed for use in Ethernet switch,
hub, and router systems and in ATM switches with
Ethernet support. Offering the latest features of the
IEEE 802.3 specification (ISO/IEC 8802-3:1996),
the CS8904 can be easily interfaced to custom
digital system ASICs. Inputs to the CS8904 from
the digital system ASIC are: transmit data, transmit
enable, duplex selection, auto-negotiation
selection, and loopback selection (loopback from
digital system ASIC through CS8904 to digital
system ASIC), and mode selection. Mode selection
allows the CS8904 to operate with a variety of
compatible Ethernet controllers.
•
•
•
The CS8904 is designed to be used on a 4-layer
circuit board instead of a more expensive multi-
layer board, saving board manufacturing costs.
The CS8904 has been designed for very low
noise emission. As a result FCC testing and
qualification time is reduced considerably.
Half and full duplex operation make the
CS8904 ideal for use in 10BASE-T Ethernet
switch designs and in ATM switch systems that
require 10BASE-T Ethernet ports.
Outputs of the CS8904 to the digital system ASIC
are: transmit clock, receive clock, receive data, and
five status lines: collision detect, carrier detect,
jabber indication, duplex (half / full), and auto-
negotiation (active / inactive).
•
Auto-Negotiation capability that is fully com-
pliant with the latest IEEE Ethernet specifica-
tion (ISO/IEC 8802-3:1995(u)) provides the
newest Ethernet features to system designers.
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