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®
Intel
855GME Chipset and Intel
Hub Interface
The GMCH and 6300ESB ballout assignments have been optimized to simplify the Hub Interface
routing between these devices. It is recommended that the Hub Interface signals be routed directly
from the GMCH to the 6300ESB with all signals referenced to V
keep to a minimum. When a layer change is required, use only two vias per net and keep all data
signals and associated strobe signal on the same layer.
The Hub Interface signals are broken into two groups: data signals (HI) and strobe signals
(HI_STB). For the 8-bit Hub Interface, HI[11:0] are associated with HI_STB/HI_STBS and
HI_STB#/HI_STBF.
Note: These routing guidelines are created using the stack-up described in
Board Stack-up Dimensions" on page
Figure 85.
8-Bit Hub Interface Routing Example
8.1
8-Bit Hub Interface Routing Guidelines.
8.1.1
8-Bit Hub Interface Data Signals
The 8-bit Hub Interface data signal traces (HI[11:0]) should be routed through stripline or
microstrip routing with 5 mil width and 15 mil spacing.
routed 5 mil width and 5 mil spacing for navigation around components, mounting holes or in order
to break out of the GMCH and the 6300ESB package. The signals must be separated no longer than
300 mils from the package.
Table 66.
Hub Interface 1.5 Data Signals Routing Summary
Digital Signal
Requirement
5 mil width, 15 mil
spacing
®
6300ESB ICH Embedded Platform Design Guide
34.
Maximum Trace
Referencing
Length
8 inches
Ground
January 2007
. Layer transition should be
SS
Figure 2, "Recommended
(See Table
66.) These signals may be
Data Signal Length Matching
Each strobe signal must be the same length,
and each data signal must be matched within
± 0.25 inches of the strobe signals.
Hub Interface
8
183
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