Usb 2.0 Termination; Usb 2.0 Trace Length Pair Matching; Usb 2.0 Trace Length Guidelines; Plane Splits, Voids, And Cut-Outs (Anti-Etch) - Intel 852GM Design Manual

I/O Subsystem

Figure 82. USBRBIAS Connection

Table 69. USBRBIAS/USBRBIAS# Routing Summary

USBRBIAS/ USBRBIAS#
Routing Requirements
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
Back Panel
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.
166
ICH4-M
USBRBIAS
USBRBIAS#
Maximum Trace
5 on 5
Signal Signal Matching
Referencing
Ground
22.6 Ω +/- 1%
Signal Length Matching
Length
500 mils
Motherboard
Trace Length
150 mils 17 inches
®
Intel 852GM Chipset Platform Design Guide
Signal Referencing
N/A N/A
Card Trace Maximum Total
Length
N/A
R
Length
17 inches