Guide

I/O Subsystem
R
166 Intel
®
852GM Chipset Platform Design Guide
Figure 82. USBRBIAS Connection
ICH4-M
USBRBIAS
USBRBIAS#
22.6
Ω
+/- 1%
Table 69. USBRBIAS/USBRBIAS# Routing Summary
USBRBIAS/ USBRBIAS#
Routing Requirements
Maximum Trace
Length
Signal Length Matching Signal Referencing
5 on 5 500 mils N/A N/A
10.4.1.4. USB 2.0 Termination
A common-mode choke should be used to terminate the USB 2.0 bus. Place the common-mode choke as
close as possible to the connector pins. See Section 10.4.4 for details.
10.4.1.5. USB 2.0 Trace Length Pair Matching
USB 2.0 signal pair traces should be trace length matched. Max trace length mismatch between USB 2.0
signal pair should be no greater that 150 mils.
10.4.1.6. USB 2.0 Trace Length Guidelines
Table 70. USB 2.0 Trace Length Preliminary Guidelines (with Common Mode Choke)
Configuration Signal
Referencing
Signal Matching Motherboard
Trace Length
Card Trace
Length
Maximum Total
Length
Back Panel Ground 150 mils 17 inches N/A 17 inches
NOTES:
1. These lengths are based upon simulation results and may be updated in the future.
2. All lengths are based upon using a common-mode choke (see Section
10.4.4.1 for details on common-mode
choke).
10.4.2. Plane Splits, Voids, and Cut-Outs (Anti-Etch)
The following guidelines apply to the use of plane splits voids and cutouts.