1. Placement, Signal and Trace Routing • Place the 10/100M magnetic as close as possible to the DM9000 (no more than 20mm) and to the RJ-45 connector. • Place the termination resistors 50Ω as close as possible to the 10/100M magnetic and the DM9000 RX± pins and TX±pins. The 50Ω resistors and grounding capacitors of TX± and RX± should be placed near the DM9000 (no more than 10mm)。 • The 25MHz crystal should not be placed near important signal traces, such as RX±receive pair and TX± transmit pair, band gap resistor, magnetic, and board edge. • Traces routed from the DM9000 RX± pair to the 10/100M magnetic and the RJ45 connector should run symmetrically, directly, identically, and closely (no more than 2mm)。 The same rule is applied to traces routed from the DM9000 TX± pair.
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