LXT970A NIC Demo Board
with DEC 21143 Controller
JANUARY 1999
User Guide
General Description
Features
Revision 1.4
The LXT970A NIC Demo Board provides a complete
working platform for evaluation of the LXT970A Fast
Ethernet Transceiver interfacing with the DEC 21143 LAN
Controller in a 10BASE-T and/or 100BASE-TX
environment.
The NIC Demo Board can be configured to operate in 10/
100Mbps (4B) Nibble Mode or (5B) Symbol Mode. This
document describes typical Demo Board setup procedures
for a 100BASE-TX environment. The NIC Demo board is
designed to plug directly into a PC and includes the driver
software required for the controller interface. LXT970A
NIC Demo Board is operated with a single 5V power
supply.
A complete Bill of Materials and schematics are included
for reference.
Before using the NIC Demo Board, review the latest
LXT970A Fast Ethernet Transceiver data sheet for the
most current information.
• Quick setup and ease of use for complete system
demonstration
• LXT970A Fast Ethernet Transceiver
• DEC 21143-PB LAN Controller
• Netware Driver software included
• Configurable for:
10Mbps / 100Mbps operation
(4B)Nibble Mode / (5B)Symbol Mode operation
• Single RJ45 connection
• LED indicators for major functions
• Standard half duplex or full duplex operation at 10 or
100Mbps
JP9
J2
T R A N S F O R M E R
LXT970A
E N B L
C O L
L N K
T X
R X
D P X
D E C
21143-PB
U3
M F 1
M F 2
M F 3
M F 4
M F 0
C F G 0
F D E
C F G 1
T R S T
M D D I S
u
U7
U1
D1
D2
D3
D4
D5
D6
U5
U6
Y1
U8
T 1
U2
JP7
JP8
J10
u
U4
JP2
JP4
JP3
JP5
JP6
u
u
u
u
u
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