88e3015 Marvell Semiconductor, Inc., 88e3015 Datasheet - Page 32

• Manufacturer Part Number: 88e3015
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

2.4 Power Management
The 88E3015/88E3018 devices support advanced power management modes that conserve power.
Three low power modes are supported in the 88E3015/88E3018 devices.
IEEE 22.2.4.1.5 power down compliance allows for the PHY to be placed in a low-power consumption state by
register control.
Energy Detect+
additional capability to wake up a link partner. The 10BASE-T link pulses are sent once every second while listen-
ing for energy on the line.
COMA mode shuts down the PHY into a low power state.
Table 15 displays the low power operating mode selection.
2.4.1 IEEE Power Down Mode
The standard IEEE power down mode is entered by setting Register 0.11 equal to one. In this mode, the PHY
does not respond to any MAC interface signals except the MDC/MDIO. It also does not respond to any activity on
the CAT 5 cable.
In this power down mode, the PHY cannot wake up on its own by detecting activity on the CAT 5 cable. It can only
wake up by clearing the PwrDwn bit to 0.
2.4.2 Energy Detect +
When Register 16.14 is enabled, the Energy Detect +™ mode is enabled. In this mode, the PHY sends out a sin-
gle 10 Mbps NLP (Normal Link Pulse) every one second. If the 88E3015/88E3018 devices are in Energy Detect+
mode, it can wake a connected device. The 88E3015/88E3018 devices also respond to MDC/MDIO.
2.4.3 Normal 10/100 Mbps Operation
Normal 10/100 Mbps operation can be entered by either using a register write during the energy detect mode.
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Doc. No. MV-S103657-00, Rev. C
Page 32
IEEE 802.3 22.2.4.1.5 compliant power down
Energy Detect+
COMA mode
Table 15:
Power Mode
IEEE Power Down
Energy Detect+
COMA
TM
allows the 88E3015/88E3018 devices to wake up when energy is detected on the wire with the
TM
Operating Mode Selection
TM
88E3015/88E3018
Integrated 10/100 Fast Ethernet Transceiver
Document Classification: Proprietary Information
TM
How to Activate Mo de
PwrDwn bit write (Register 0.11)
Register EDet bit write (Register 16.14)
COMAn pin
CONFIDENTIAL
October 26, 2006, Advance
Copyright © 2006 Marvell