Product specifications

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Preliminary Revision 0.5, November 19, 1999 60 Motherboard Design Guidelines
Technologies, Inc.
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The layout guidelines for USB are listed below.
• Each pair of USB data signals is required to be parallel to each other with the same trace length.
• Each pair of USB data signals is required to be parallel to a respective ground plane.
A routing example of two pairs of USB data buses is shown in figure 2-53 below.
VT82C686A
(South Bridge)
USBP0+
USBP0-
USBP1-
USBP1+
USB0
Connector
USB1
Connector
Recommended
Not recommended
Figure 2-53. USB Differential Signal Routing Example