ADSP-214xx SHARC Processor Hardware Reference 23-37
System Design
Circuit Board Layout
This section gives recommendations to physical layouts for high speed
designs.
• Place the oscillator close to the destination.
• Place the series termination close to the clock source.
For trace routing:
• Place a GND plane below the oscillator and buffer.
• Place a solid GND reference plane under the clock traces.
• Do not route the digital signals near or under the clock sources.
Other Recommendations and Suggestions
• Use more than one ground plane on the PCB to reduce crosstalk.
Be sure to use lots of vias between the ground planes. One V
DD
plane for each supply is sufficient. These planes should be in the
center of the PCB.
• To reduce crosstalk, keep critical signals such as clocks, strobes,
and bus requests on a signal layer next to a ground plane away
from, or lay out these signals perpendicular to, other non-critical
signals.
• If possible, position the processors on both sides of the board to
reduce area and distances.
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