WG82577LM S LGWS Intel, WG82577LM S LGWS Datasheet - Page 35

• Manufacturer Part Number: WG82577LM S LGWS
• Manufacturer: Intel

Specifications of WG82577LM S LGWS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Power Management and Delivery—82577 GbE PHY
6.3.1.2
6.3.1.3
Figure 7.
Note:
Table 8.
Cable Disconnect State
The 82577 enters a cable disconnect state if it detects a cable disconnect condition on
the Ethernet link. Power is reduced during cable disconnect mode by several means:
An exit from cable disconnect happens when the 82577 detects energy on the MDI link,
and starts the following exit sequence:
Power Down State
The 82577 enters a power-down state when the LAN_DISABLE_N pin is set to zero.
Exiting this mode requires setting the LAN_DISABLE_N pin to a logic one.
Figure 7
Power-Down Sequence
If the LAN_DISABLE_N pin cannot be used, a power-down in-band can be used. When
used, the power savings are lower since all logic cannot be turned off in this mode.
Figure 7 Notes
Note
• The PHY enters energy detect mode.
• The PCIe link enters power down.
• The 82577 signals the MAC that link energy was detected by clearing the Cable
• The PHY waits until the auto-negotiation break link timer expires (T
LAN_DISABLE_N
1
2
3
4
5
6
Disconnect bit in the PCIe or SMBus interface.
then starts to advertise data on the line.
PCIe/SMBus
PHY
MAC sends an in-band power-down message through SMBus or PCIe or LAN_DISABLE_N pin set to
zero.
Once the 82577 detects the power-down message or LAN_DISABLE_N transitions to a logic zero, the
PHY enters a power-down state.
The PCIe link (if enabled) enters electrical idle state.
PCIe/SMBus exits a reset state and performs link initialization.
MAC configures the 82577 through the MDIO interface.
PHY goes through auto-negotiation to acquire link.
shows the power-down sequence.
Active
Power
Down
1
2
Power Down
Description
3
4
Active
c2an
Device
conf.
time) and
5
Start
AN
6
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