Additional Guidelines; Critical Signals Routing Summary; Frequency Sensitivity - Intel Quark SoC X1000 Design Manual

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16.3

Additional Guidelines

All critical signals must stay away from potential glitch or noise sources on the
platform. It is recommended to keep all critical signal traces a minimum of 15 mils
away from any clock or high speed differential signals with > 4V/ns edge rate, to avoid
glitches from crosstalk.
Table 54.

Critical Signals Routing Summary

Parameter
Spacing
Experiment data shows that certain signals have shown high sensitivity to specific
frequencies. Routing those signals near to the frequency source will increase the
glitches due crosstalk. The relationship of each signals with the frequency it is sensitive
to, is listed in
sensitive frequency and the harmonics of its sensitive frequency. If this cannot be
avoided, it should be kept a minimal of 15 mils from the respective signal trace.
Table 55.

Frequency Sensitivity

PWR_BTN
WAKE_B
®
Intel
Quark™ SoC X1000
PDG
106
®
Intel
Quark™ SoC X1000—Critical Low Speed Signals Design Guidelines
Stackup
Units
(MS/SL/DSL)
MS
mils
Table
55. Designer should try to avoid routing a signal next to the
Signal Name
Routing
Recommendation
15mils
Frequency to Avoid
25 MHz
12.5 MHz
§ §
Order Number: 330258-002US
June 2014

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