Davicom DM9000 Manual
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Contents
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DM9000ISA to Ethernet MAC Controller with Integrated 10/100 PHY36 FinalVersion: DM9000-DS-F02June 26, 20029.11 Power Reduced ModeThe Signal detect circuit is always turned to monitor whetherthere is any signal on the media (cable disconnected). TheDM9000 automatically turns off the power and enters thePower Reduced mode, whether its operation mode is N-way or force mode. When enters the Power Reducedmode, the transmit circuit still sends out fast link pules withminimum power consumption. If a valid signal is detectedfrom the media, which might be N-ways fast link pules,10Base-T normal link pules, or 100Base-TX MLT3 signals,the dev ic e will wak e up and res um e a norm aloperation mode.That can be writing Zero to Reg.16.4 of MII register todisable Power Reduced mode.9.11.1 Power Down ModeThe Reg.0.11 of MII register can be set high to enter thePower Down mode, which disables all transmit, receivefunctions and MII interface functions, except the MDC/MDIOmanagement interface.9.11.2 Reduced Transmit Power ModeThe additional Transmit power reduction can begained by designing with 1.25:1 turns ration magneticon its TX side and using a 8.5KΩ resistor on BGRESand AGND pins, and the TXO+/TXO- pulled highresistors should be changed from 50 Ω to 78 Ω .This configuration could be reduced about 20%transmit power. |
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