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248 Software Developer’s Manual
Register Descriptions
100BASE-TX Half
Duplex
100Base-TX
(82541xx and
82547GI/EI)
7
1b = Advertise.
0b = Not advertised.
Values programmed in the Auto-
Negotiation advertisement register
have no effect unless Auto-
Negotiation is restarted (PHY Control
Register) or link goes down.
This bit can be overridden by the PHY
Control Register.
82544GC/EI only:
Bit 5: (ANEG[3:0] = 0010b |
ANEG[3:2] = 11b) and (MODE[3:0] is
not any of xx01b, 1x00b, 001xb,
0111b).
82541xx and 82547GI/EI only
1
:
1b = DTE is 100BASE-TX capable.
0b = DTE is not 100BASE-TX
capable.
R/W
1b
ANEG[3:1]
MODE[3:0]
1b
Retain
100BASE-TX Full
Duplex
8
1b = Advertise.
0b = Not advertised.
Values programmed in the Auto-
Negotiation advertisement register
have no effect unless Auto-
Negotiation is restarted (PHY Control
Register) or link goes down.
This bit can be overridden by the PHY
Control Register.
82544GC/EI only:
Bit 8: (ANEG[3:0] = 0011b |
ANEG[3:2] = 11b) and (MODE[3:0] is
not any of xx01b, 1x00b, 001xb,
0111b).
82541xx and 82547GI/EI only:
1
1b = DTE is 100BASE-TX full duplex
capable.
0b = DTE is not 100BASE-TX full
duplex capable.
R/W
1b
ANEG[3:0]
MODE[3:0]
1b
Retain
100BASE-T4 9 0b = Not capable of 100BASE-T4. RO Always 0b
PAUSE 10
1b = MAC PAUSE implemented.
0b = MAC PAUSE not implemented.
Values programmed in the Auto-
Negotiation advertisement register
have no effect unless Auto-
Negotiation is restarted (PHY Control
Register) or link goes down.
82541xx and 82547GI/EI only:
Advertise to Partner that Pause
operation (as defined in 802.3x) is
desired.
R/W
0b
1b for the
(82541xx
and
82547GI/
EI)
Retain
Table 13-20. Auto-Negotiation Advertisement Register Bit Description
Field Bit(s) Description Mode HW Rst SW Rst