When designing the e-MMC interface, consider the following recommendations:
Match signal lengths to within 50 mils. Affected PIOs in the example above are
PA0 to PA9.
Place the clock line (PA0) at least 3 times the trace width away from other
signals for noise immunity.
Place data signals at least 2 times the trace width away from any other data
trace.
Place data signals at least 1 trace width away from any copper plan.
Figure 4-24. e-MMC Layout Example
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