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DP83867IR: Link Status in BMSR and PHYSTS

Part Number: DP83867IR

Hello,

My customer have some questions about Link Status bits in BMSR and PHYSTS in DP83867IR.

[Background]

They use DP83867IR in their system.

Their link was established with 1000BASE-T.

In this case, it will be in the following state.

  * LED port (1000BT link established) = 1

  * AUTO-NEGOTIATION COMPLETE in BMSR = 1

  * LINK STATUS in BMSR = 0

  * LINK_STATUS in PHYSIS = 0 -> 1 (It takes many time to change,)

They confirmed that when link was established with 100BASE-TX, LINK STATUS in BMSR became 1.

[Q1]

Is this behavior appropriate ?

[Q2]

Why does LINK STATUS in BMSR not become 1 in the case of 1000BASE-T ?

[Q3]

Why does it take many time for LINK_STATUS in PHYSIS to become 1 in the case of 1000BASE-T ?

Can LINK_STATUS in PHYSIS change at the same time as link established ?

Best Regards,

Hiroshi Katsunaga