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9
Hub Interface
The GMCH ball assignment and ICH2 ball assignment have been optimized to simplify hub
interface routing. It is recommended that the hub interface signals be routed directly from the
GMCH to the ICH2 on the top signal layer. Refer to Figure 54.
The hub interface is divided into two signal groups: data signals and strobe signals.
• Data Signals:
HL[10:0]
• Strobe Signals:
HL_STB
HL_STB#
HL_STB/HL_STB# is a differential strobe pair.
No pull-ups or pull-downs are required on the hub interface. HL11 on the ICH2 should be brought
out to a test point for NAND Tree testing. Each signal should be routed such that it meets the
guidelines documented for its signal group.
Figure 54. Hub Interface Signal Routing Example
NAND tree
®
Intel
815EG Chipset Platform Design Guide
test point
HL11
ICH2
HL_STB
HL_STB#
HL[10:0]
GCLK
CLK66
Clocks
Hub Interface
GMCH
hub_link_sig_routing
97
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