AN983 ETC [List of Unclassifed Manufacturers], AN983 Datasheet - Page 90

• Manufacturer Part Number: AN983
• Description: PCI/miniPCI-to-Ethernet LAN Controller
• Manufacturer: ETC [List of Unclassifed Manufacturers]

12.3 VCC AND GND
Rev. 1.8
6). Keep the distance between the Tx and Rx differential pairs large, even separate ground
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
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
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
3). Power source use bulk capacitors (22~47uf) to reduce noise.
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.
Vcc power:
planes underneath Tx and Rx signal pairs.
transformer to RJ45, too.
less then 1.5 inch
to connect each other).
AN983B
Bad
www.admtek.com.tw
ADMtek Inc.
PCI/miPCI Fast Ethernet Controller with integrated PHY
Good
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