CS8904
Advanced Product Databook
FEATURES
■ Single-Chip Quad IEEE 802.3-compliant Ethernet
Interface
Crystal LAN™ Quad
Ethernet Transceiver
■ 3 V and 5 V Operation
■ Full and Half Duplex Operation
■ Auto-Negotiation with Manual Override Capability
■ Four 10BASE-T Ports with Integrated Active Ana-
DESCRIPTION
log Filters
■ Automatic Polarity Detection and Correction
The CS8904 combines four 10BASE-T Ethernet EN-
DECs and transceivers into a single low-cost device.
Complete on-chip 10BASE-T Transceivers and filters
eliminate external components, saving valuable board
space and reducing cost. The CS8904 offers maximum
design flexibility by providing individual control and sta-
tus lines for each of the four interface ports.
■ Integrated Manchester Encoder/Decoders
(ENDEC)
■ Link Status LED Driver for Each Port
■ Per Port Control - Manual Duplex select (Half or
Full), Auto-Negotiation select, Loopback select
■ Per Port Status - Collision detect, Carrier detect,
Jabber indication, Link status, Duplex status,
Auto-Negotiation status
The CS8904 supports full-duplex operation, allowing si-
multaneous transmission and reception on all ports.
Auto-negotiation allows the automatic selection of ei-
ther half or full duplex operation on a per-port basis.
ORDERING INFORMATION
The CS8904 is ideally suited for cost-sensitive Ethernet
switch designs. With the CS8904, engineers can design
a four-port Ethernet Transceiver circuit that occupies
less than 1.0 square inch (6.5 sq. cm) of space, exclu-
sive of transformers and RJ-45 connectors.
CS8904-CM5 0 to 70 °C
CS8904-CM3 0 to 70 °C
CDK8904-5
100-pin MQFP, 5.0 V
100-pin MQFP, 3.3 V
Developer’s Kit, 5.0 V
CS8904 Quad Ethernet Transceiver
LINK LED
STATUS (5)
TxDATA
10BASE-T RX Filters & Receiver
Encoder/Decoder & PLL
RJ-45 10BASE-T
RxDATA
10BASE-T TX Filters &Transmitter
RxCLK
CONTROL(4)
LINK LED
STATUS (5)
TxDATA
10BASE-T RX Filters & Receiver
Encoder/Decoder & PLL
RJ-45 10BASE-T
RxDATA
10BASE-T TX Filters &Transmitter
RxCLK
CONTROL(4)
LINK LED
STATUS (5)
TxDATA
10BASE-T RX Filters & Receiver
Encoder/Decoder & PLL
RxDATA
RJ-45 10BASE-T
RxCLK
CONTROL(4)
10BASE-T TX Filters &Transmitter
LINK LED
STATUS (5)
TxDATA
10BASE-T RX Filters & Receiver
Encoder/Decoder & PLL
RxDATA
RJ-45 10BASE-T
RxCLK
CONTROL(4)
10BASE-T TX Filters &Transmitter
TxCLK
Clock
RESET
RES
VDD(11) GND(13) MODE(3)
20 MHz XTAL
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
Copyright Cirrus Logic, Inc. 1998
(All Rights Reserved)
FEB ‘98
DS191PP2