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1.0
General Description
The LXD9781 Demo Board is an eight-port 10/100 Mbps Fast Ethernet Media Access Unit (MAU)
that provides a working platform for evaluation of the LXT9781 Fast Ethernet 10/100 Octal
Transceiver in 10BASE-T and/or 100BASE-TX/FX applications.
All eight network ports provide a combination twisted-pair (TP) for a 10/100BASE-TX connection
or pseudo-ECL (PECL) interface for a 100BASE-FX connection.
The LXD9781 Demo Board allows system designers to test 10 Mbps and 100 Mbps link
performance, auto-negotiation, and register functionality using a standard MII interface prior to
board prototyping. Four FPGAs convert the eight RMII interfaces on the LXT9781 to eight
standard MII interfaces. This simplifies evaluation of the LXT9781, rendering it compatible with
existing MII test equipment.
The LXD9781 requires only a single 3.3V power supply. Refer to the latest LXT9761/81 data sheet
for device functionality and specifications.
1.1
Features
•
Eight independent IEEE 802.3-compliant 10BASE-T or 100BASE-TX ports.
•
Quick setup, ease of use, and clear visibility of application settings for:
— - Complete system demonstration.
— - Individual circuit isolation.
•
JTAG boundary scan.
•
Auto-negotiation protocol compliant with legacy systems that do not support auto-negotiation.
•
Three LED options for major functions:
— - Direct drive LEDs.
— - Serial LED output.
— - Quick Status LED output.
•
Configurable via MDIO port or hardware jumpers.
•
Half- or full-duplex operation at 10 or 100 Mbps.
•
100BASE-FX fiber-optic capability on all ports.
Developer Manual
LXD9781 PQFP Demo Board
5
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