The Cadence software is used to establish the DDRⅡ signal topology structure, simulate the signal crosstalk, inter-symbol interference, overshoot and other parameters related to signal quality. The parameters related to signal timing can be measured from the simulation waveform, so as to calculate the signal timing margin and set constraints for DDRⅡ signals for routing. After routing is completed, the Cadence software is used for post-board simulation to verify the integrity and timing relationship of the DDRⅡ signal. And based on the simulation results, some design rules are summarized.
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