Platform Clock Routing Guidelines
48
Design Guide
4.1.5
CLK14 Clock Group
The driver in the CLK14 clock group is the clock synthesizer 14.318 MHz clock output buffer, and
the receiver is the 14.318 MHz clock input buffer at the ICH3-S, SIO and LPC.
Figure 4-13. Topology for CLK14
Table 4-8. CLK14 Routing Guidelines
Parameter
Routing Guidelines
Clock Group
CLK14
Topology
Point-to-Point
Reference Plane
Ground referenced (contiguous over entire length)
Characteristic Trace Impedance (Z
0
)
50
Ω
± 10%
Trace Width
5 mils
Trace Spacing
10 mils
Trace Length – L1
0.00” – 0.50”
Trace Length – L2
3.00” – 9.0”
Resistor
R1 = 22
Ω
± 5%
Skew Requirements
None
R1
L1
L2
Intel
®
ICH3-S
SIO, and LPC
Clock
Driver
Содержание Xeon
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