MCB2300: RMII CLOCK ON PINCORRECT
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National Semiconductor DP93949 product specialists have analyzed that the 25MHz clock out pin should not be used for RMII Ethernet clock reference on LPC23xx pin P1.15.
The 25MHz_OUT signal is a delayed version of the X1/REF_CLK input. While this clock may be used for other purposes it should not be used as the timing reference for RMII control and data signals.
Connect the 50MHz signal on X1 directly to the RMII Ethernet clock reference on LPC23xx pin P1.15.
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Last Reviewed: Tuesday, October 23, 2007
of your data.