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UG155 March 24, 2008
Chapter 9: Configuration and Status
R
Register 4: Auto-Negotiation Advertisement
Table 9-5: PHY Identifier (Registers 2 and 3)
Bit(s) Name Description Attributes Default Value
2.15:0 Organizationally Unique
Identifier
Always return 0s returns 0s 0000000000000000
3.15:10 Organizationally Unique
Identifier
Always return 0s returns 0s 000000
3.9:4 Manufacturer’s model
number
Always return 0s returns 0s 000000
3.3:0 Revision Number Always return 0s returns 0s 0000
MDIO Register 4: Auto-Negotiation Advertisement
Table 9-6: Auto-Negotiation Advertisement Register (Register 4)
Bit(s) Name Description Attributes
Default
Value
4.15 Next Page 1 = Next Page functionality is advertised
0 = Next Page functionality is not
advertised
read/write 0
4.14 Reserved Always returns ‘0,’ writes ignored returns 0 0
4.13:12 Remote
Fault
00 = No Error
01 = Offline
10 = Link Failure
11 = Auto-Negotiation Error
read/write
self clearing to 00
after auto-
negotiation
00
4.11:9 Reserved Always return 0s, writes ignored returns 0 0
4.8:7 Pause 00 = No PAUSE
01 = Symmetric PAUSE
10 = Asymmetric PAUSE towards link
partner
11 = Both Symmetric PAUSE and
Asymmetric PAUSE towards link partner
read/write 11
NEXT PAGE
RESERVED
RESERVED
REMOTE FAULT
HALF DUPLEX
15 14 13 12 11 7 6 5 0
Reg 4
RESERVED
9
8
PAUSE
4
FULL DUPLEX
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