CS8904
Advanced Product Databook
FEATURES
s
Single-Chip Quad IEEE 802.3-compliant Ethernet
Interface
s
3 V and 5 V Operation
s
Full and Half Duplex Operation
s
Auto-Negotiation with Manual Override Capability
s
Four 10BASE-T Ports with Integrated Active Ana-
log Filters
s
Automatic Polarity Detection and Correction
s
Integrated Manchester Encoder/Decoders
(ENDEC)
s
Link Status LED Driver for Each Port
s
Per Port Control - Manual Duplex select (Half or
Full), Auto-Negotiation select, Loopback select
s
Per Port Status - Collision detect, Carrier detect,
Jabber indication, Link status, Duplex status,
Auto-Negotiation status
ORDERING INFORMATION
CS8904-CM5 0 to 70 °C
CS8904-CM3 0 to 70 °C
CDK8904-5
Crystal LAN™ Quad
Ethernet Transceiver
DESCRIPTION
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.
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.
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.
100-pin MQFP, 5.0 V
100-pin MQFP, 3.3 V
Developer’s Kit, 5.0 V
CS8904 Quad Ethernet Transceiver
STATUS (5)
TxDATA
RxDATA
RxCLK
CONTROL(4)
STATUS (5)
TxDATA
RxDATA
RxCLK
CONTROL(4)
STATUS (5)
TxDATA
RxDATA
RxCLK
CONTROL(4)
STATUS (5)
TxDATA
RxDATA
RxCLK
CONTROL(4)
TxCLK
10BASE-T RX Filters & Receiver
Encoder/Decoder & PLL
10BASE-T TX Filters &Transmitter
LINK LED
RJ-45 10BASE-T
LINK LED
Encoder/Decoder & PLL
10BASE-T RX Filters & Receiver
10BASE-T TX Filters &Transmitter
RJ-45 10BASE-T
LINK LED
Encoder/Decoder & PLL
10BASE-T RX Filters & Receiver
10BASE-T TX Filters &Transmitter
RJ-45 10BASE-T
LINK LED
Encoder/Decoder & PLL
10BASE-T RX Filters & Receiver
10BASE-T TX Filters &Transmitter
RJ-45 10BASE-T
Clock
VDD(11) GND(13)
MODE(3)
RESET
RES
20 MHz XTAL
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
FEB ‘98
Copyright
©
Cirrus Logic, Inc. 1998
(All Rights Reserved)
DS191PP2
CIRRUS [ CIRRUS LOGIC ]
