Intel VC820 Design Guide - Page 69
Hub Interface, Hub Interface Signal Routing Example
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Layout/Routing Guidelines 2.8 Hub Interface The MCH and ICH ball assignments have been optimized to simplify hub interface routing. It is recommended that the hub interface signals be routed directly from the MCH to the ICH on the top signal layer (they do not need to be run through vias) (refer to Figure 2-4). The hub interface is broken into two signal groups: data signals and strobe signals. These groups are: • Data Signals - HL[10:0] • Strobe Signals - HL_STB - HL_STB# Note: HL_STB/HL_STB# is a differential strobe pair. There are no pull-ups or pull-downs required on the hub interface. Each signal must be routed such that it meets the guidelines documented for the signal group to which it belongs. Figure 2-33. Hub Interface Signal Routing Example 1.8V O 10 KΩ HL11 ICH HL_STB HL_STB# HL[10:0] CLK66 GCLK MCH Clocks Intel®820 Chipset Design Guide 2-43