9883 datasheet(32/56 Pages) INTEL

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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

4.0

Application Information

4.1

General Design Guidelines

Following generally accepted design practices is essential to minimize noise levels on power and

ground planes. Up to 50mV of noise is considered acceptable. 50mV to 80mV of noise is

considered marginal. High-frequency switching noise can be reduced, and its effects can be

eliminated, by following these simple guidelines throughout the design:

• Fill in unused areas of the signal planes with solid copper. Attach them with vias to a VCC or

ground plane that is not located adjacent to the signal layer.

• Use ample bulk and decoupling capacitors throughout the design (a .01

µF value is

recommended for decoupling caps).

• Provide ample power and ground planes.

• Provide termination on all high-speed switching signals and clock lines.

• Provide impedance matching on long traces to prevent reflections.

• Route high-speed signals next to a continuous, unbroken ground plane.

• Filter and shield DC-DC converters, oscillators, etc.

• Do not route any digital signals between the LXT98x3 and the RJ-45 connectors at the edge of

the board.

• Do not extend any circuit power and ground plane past the center of the magnetics or to the

edge of the board. Use this area for chassis ground, or leave it void.

Figure 9. LXT9883 MII Operation

MIIn_TXD<3:0>

MIIn_TXEN

MIIn_TXER

MIIn_TXCLK

MIIn_RXCLK

MIIn_RXD<3:0>

MIIn_RXDV

MIIn_RXER

MIIn_CRS

MIIn_COL

LXT9883

10/100

MAC

Port 1

Port 2

Port 3

Port 4

Ports 1, 2

TP Ports

MII Ports

Port 6

Port 7

Port 8

Port 5

The two LXT9883 MII ports act

as the PHY side of the MII. An

external MAC sends TX Data to

the LXT9883 to be repeated to

the network. The LXT9883

repeats network data to the MAC

via the RX Data lines.

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