Intel 82559 用户手册

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The 32-bit ID register provides a mechanism for software to determine which PHY is present. The 
contents of these registers differ depending on the PHY. There are three values encoded in registers 

2 and 3 that uniquely identify the PHY device:

•

The OUI of the PHY manufacture.

•

The model number of the PHY.

•

The revision number of the PHY.

The OUI is a 24-bit manufacturer identification number. Only the least significant 22 bits of the 

OUI are stored in the registers. The two most significant bits, bits 23:22, are fixed at 0. Bits 21:6 of 
the OUI are stored in register 2 while the remaining bits of the OUI, bits 5:0, are stored in bits 

15:10 of register 3. (The Intel manufacturer OUI number is “00AA00h.”)

The model number is a 6-bit value assigned by the manufacturer identifying the PHY model. It is 

stored in bits 9:4 of register 3. (The Intel PHY model number is “010101.”)

The revision number is a 4-bit value assigned by the manufacturer identifying the PHY revision 
number. The Intel devices use revision numbers “0000” through “0100.” The Intel 82558 has a 

revision ID number of 0000b, and the 82559, 0100b.

The map below shows how the these three numbers (OUI, model and revision numbers) are 

mapped into the MDI registers.

The PHY identification register values are as follows:

2

Link Status (LINKFLT)

RO

1 = Valid link
0 = Invalid link

Sticky bit

1

Jabber Detect (JABFLT) 

RO

1 = Jabber condition detected
0 = No jabber condition detected
NOTE: This bit is only valid in 10 Mbps mode.

Sticky bit

0

Extended Capabilities

RO

1= Extended register capabilities
0 = Basic register set capabilities only

1

Intel

00AA00h

00b

00 0000 1010 1010 00b

00 0000b

Intel 82555

00AA00h

00b

00 0000 1010 1010 00b

00 0000b

010101b

0000b

Register 2

02A8h

02A8h

02A8h

Register 3

0154h

0151h

0150h