Intel Xeon Processor Multiprocessor Platform Design Guide

29
Clock Routing Guidelines
10.R
S
values between 20 Ω – 33 Ω have shown to be effective. The value specified is the recommended value.
11. R
T
values should match the motherboard trace impedance for BCLK.
12.Minimize the trace lengths from the clock driver pin to R
S
, from R
S
to R
T
stub and the length of the R
T
stub.
Figure 5-3. Agent-to-Agent BCLK Skew
Figure 5-4. Dielectric Height to Trace Width Diagram
Tclkskw
BCLK0
Agent 0
BCLK0
Agent 1
BCLK1
Agent 0
BCLK1
Agent 1
S1
W
S2 S2
h