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30 Design Guide
Intel
®
31244 PCI-X to Serial ATA Controller
Routing Guidelines
For a symmetric trace Z11 = Z22, the differential impedance may be calculated from this equation:
Z
differential
= 2(Z11-Z12)
For two traces to be symmetric, they must have the same width, thickness and height above the ground
plane.
1
With the traces terminated with the appropriate differential, impedance ringing is minimized.
1. “Terminating Differential Signals on PCBs”, Steve Kaufer and Kelee Crisafulli, Printed Circuit Design, March 1999