Intel VC820 Design Guide - Page 46
RSL Signal Layer Alternation, B, Bottom Layer
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Layout/Routing Guidelines Figure 2-21. Section B1, Bottom Layer 2.6.2.5 NOTES: 1. Refer to Figure 2-17. Ground flood removed from picture for clarity RSL Signal Layer Alternation RSL signals must alternate layers as they are routed through the channel. If a signal is routed on the primary layer from the MCH to the first RIMM socket, it must be routed on the secondary layer from the first RIMM to the second RIMM as shown in Figure 2-22 (signal B). If a signal is routed on the secondary layer from the MCH to the first RIMM socket, it must be routed on the primary layer from the first RIMM to the second RIMM as shown in Figure 2-22 (signal A). Signals to the termination resistors can be routed on either layer from the last RIMM. 2-20 Intel®820 Chipset Design Guide