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DM9000BEP Datasheet(PDF) 56 Page - Davicom Semiconductor, Inc. |
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DM9000BEP Datasheet(HTML) 56 Page - Davicom Semiconductor, Inc. |
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56 / 63 page  DM9000B Ethernet Controller with General Processor Interface Final 56 Version: DM9000B-13-DS-F03 March 5, 2012 11. Application Notes 11.1 Network Interface Signal Routing Place the transformer as close as possible to the RJ-45 connector. Place all the 50Ω resistors as close as possible to the DM9000B RXI± and TXO± pins. Traces routed from RXI± and TXO± to the transformer should run in close pairs directly to the transformer. The designer should be careful not to cross the transmit and receive pairs. As always, vias should be avoided as much as possible. The network interface should be void of any signals other than the TXO± and RXI± pairs between the RJ-45 to the transformer and the transformer to the DM9000B.. There should be no power or ground planes in the area under the network side of the transformer to include the area under the RJ-45 connector. (Refer to Figure 11-4 and 11-5) Keep chassis ground away from all active signals. The RJ-45 connector and any unused pins should be tied to chassis ground through a resistor divider network and a 2KV bypass capacitor. The Band Gap resistor should be placed as physically close as pins 1 and 48 as possible (refer to Figure 11-1 and 11-2). The designer should not run any high-speed signal near the Band Gap resistor placement. 11.2 10Base-T/100Base-TX Auto MDIX Application Figure 11-1 Auto MDIX Application |
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