AN983B Datasheet, PDF (90/91 Pages) List of Unclassifed Manufacturers – PCI/miniPCI-to-Ethernet LAN Controller

AN983B PCI/miPCI Fast Ethernet Controller with integrated PHY
6). Keep the distance between the Tx and Rx differential pairs large, even separate ground
planes underneath Tx and Rx signal pairs.
7). Away from clock and power trace.
8). If possible, with GND plane around.
9). If Tx rout trace must cross, you can swap the trace between chip and transformer, and
transformer to RJ45, too.
10).The high frequency signal trace width 10~12mil.
11).PCI clk signal trace length must equal 2.5inch and other PCI bus signal trace length should
less then 1.5 inch
Digital signal should away from analog signal and power trace. If can’t
be avoided, better be cross over by 90 degree with analog/Vcc routing at
other plane.
Vcc trace should short and prefer route in the format of the plane a
special for GND.
Connect Pin 8 and pin 14 together first then use signal via to Gnd.
Bad
Good
12.3 VCC AND GND
Vcc power:
1). Avoid unnecessary Vcc trace to IC’s and devices keep these trace as short and wide.
2). Power trace width > 40 mils (if power trace route to the other side .It must use several via
to connect each other).
3). Power source use bulk capacitors (22~47uf) to reduce noise.
Rev. 1.8
ADMtek Inc.
www.admtek.com.tw