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System Memory Design Guidelines (DDR-SDRAM) for Memory Down Configuration
R
Figure 70. CMD Signal Routing GMCH to Micro-DIMM and Memory Down BGA 8-Load
The command signals should be routed using a 2 to 1 trace spacing to trace width ratio for signals within
the DDR group, except clocks and strobes. There should be a minimum of 20 mils spacing to non-DDR
related signals. Command signals should be routed on inner layers with minimized external traces.
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Intel
855GM/855GME Chipset Platform Design Guide
147
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