CS8904
Crystal LAN™ Quad Ethernet Transceiver
1.0 INTRODUCTION
1.1 General Description
The CS8904 is a true single-chip quad Ethernet
interface solution, incorporating all analog and
digital circuitry needed for a complete Ethernet
front end circuit. It includes high-performance on-
chip filtering, eliminating the need for external
filters. In addition, the CS8904 supports the latest
IEEE Ethernet features including full duplex and
Auto-Negotiation.
The CS8904 incorporates four independent
Manchester encoder/decoders (ENDEC), clock
recovery circuits, 10BASE-T transceivers, and link
status LED circuits. The 10BASE-T transceivers
include drivers, receivers, and high-performance
on-chip analog filters, allowing direct connections
to low-cost isolation transformers. The CS8904’s
superior EMI characteristics are a result of the
high-quality receive and transmit filters which
eliminate the need for external filter packs and help
to make FCC Part 15, Class B compliance easier to
achieve. Each of the four transceivers support half
and full duplex operation and include IEEE-
compliant Auto-Negotiation capability.
20 MHz
XTAL
CS8904
RJ-45
10BASE-T
LINKLED
S
W
I
T
C
H
I
N
G
B
U
S
RJ-45
10BASE-T
SYSTEM
ASIC
LINKLED
RJ-45
10BASE-T
LINKLED
RJ-45
10BASE-T
LINKLED
Figure 1. Ethernet Switching Hub Application of CS8904
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
DS191PP2
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