Intel 82559 用户手册

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In the D0 state, the device maintains an active link. The 82558 B-step (refer to 

) and later devices also maintain an active link in the D3 state if PME 

is enabled and the device has power. This implies:

•

10BASE-T Mode: The device expects a normal clock input on the X1 and X2 pins. It expects 

to receive normal reception on the Receive Differential Positive and Receive Differential 
Negative signals (RDP/RDN pair). The device will not transmit on the Transmit Differential 

Positive and Transmit Differential Negative signals (TDP/TDN pair).

•

100BASE-TX Mode: The device expects a normal clock input on the X1 and X2 pins and to 
receive normal reception on the RDP/RDN pair. It transmits a continuous idle stream on the 

TDP/TDN pair, as required by the 100BASE-TX standard. The 82558 does not transmit 

frames on the link.

•

Auto-Negotiation: If the link fails while the device is in the D1 state, it performs the normal 

auto-negotiation protocol in order to re-establish the link. For the 82558 B-step, if the link fails 

in the D3 state and PME is enabled and the device has power, the device will attempt to use the 
normal auto-negotiation protocol in order to re-establish the link. If the link fails on the 82559 

in the D3 state and PME is enabled and the device has power, the 82559 will go into a deep 

power down state, rather than trying to re-establish the link with the auto-negotiation protocol.

During the D3 power state, the 82558 A-step does not maintain an active link. The 82558 B-step 
and later generation devices do not maintain a link in D3 if PME is disabled or if the device does 

not have power.