DM9008C View Datasheet(PDF) - Davicom Semiconductor, Inc.
Part Name
Description
MFG CO.
'DM9008C' PDF : 52 Pages View PDF
DM9008C
Ethernet Controller with General Processor Interface
9.9 Power Reduced Mode
The Signal detect circuit is always turned to monitor whether
there is any signal on the media (cable disconnected). The
DM9008C automatically turns off the power and enters the
Power Reduced mode, whether its operation mode is
N-way or force mode. When enters the Power Reduced
mode, the transmit circuit still sends out fast link pules with
minimum power consumption. If a valid signal is detected
from the media, which might be N-ways fast link pules,
10Base-T normal link pulse, or 100Base-TX MLT3 signals,
the device will wake up and resume a normal
operation mode.
That can be writing Zero to PHY Reg. 16.4 to disable Power
Reduced mode.
9.9.1 Power down Mode
The PHY Reg.0.11 can be set high to enter the Power
Down mode, which disables all transmit and receive
functions, except the access of PHY registers.
9.9.2 Reduced Transmit Power Mode
The additional Transmit power reduction can be
gained by designing with 1.25:1 turns ration magnetic
on its TX side and using a 8.5KΩ resistor on BGRES
and AGND pins, and the TXO+/TXO- pulled high
resistors should be changed from 50Ω to 78Ω. This
configuration could be reduced about 20% transmit
power.
Preliminary
39
Version: DM9008C-13-DS-P01
January 15, 2008
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