MSI DDR4 Boost Technology Info

2

Fiber Weave Effect

If trace routed over a fiberglass horizontally or vertically the signal would become distortion because it is lay on fiber weave and resin(holes). The trace should always be on fiber weave or on resin to make sure signal performance stable.

Fiber weave Effect

Figure 2 Fiber weave effect example of differential pair routing showing one trace routed over a fiberglass bundle for a portion of its length while the other trace is routed over mostly resin.

Cross-Section of PCB indicating effect of PCB Fiber Weave

Etching / Plating impacts on Trace Geometries

Fiberglass Bundle Waves directly under trace

Resin rich dielectric directly under trace

RX should get the same wave from TX

TX TXRX RX

Excellent Poor

MSI DDR4 BOOST Technology

Layout Engineer make sue of Zig-Zag routing procedure to

prevent fiber weave effect to make sure signal quality

stable and reduce radiation interference

Figure 15: 11.31 Degree Zig-Zag

All length dimensions are in mils

All control Trace vertices are located on 5 mil grid points making manual routing easier to manage.

Control Trace

250

50

250

11.31°50

Server Level Routing

Figure 14. Zig-Zag Routing

L

W

L

W

θ=tan (W/L)-1

θ

CPU

Memory

Moat: just like wall to prevent outer noise interference

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