Intel 82559 用户手册
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10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual
Physical Layer Interface
7.3
Intel 82555 Specific Registers
Note: The Intel MAC/PHY silicon devices (82558, 82559, 82550, and 82551) use the 82555 as the base
for their integrated PHY units. Therefore, the information contained in this section and the
following subsections apply to the all 8255x Fast Ethernet controllers except the 82557.
following subsections apply to the all 8255x Fast Ethernet controllers except the 82557.
7.3.1
Status and Control Register: Register 16
Bit
Name
R / W
Description
Default
15
Flow Control
RW
1 = Flow control enabled.
0 = Flow control disabled.
NOTE: This bit should always equal 0 for the
0 = Flow control disabled.
NOTE: This bit should always equal 0 for the
82559.
0
14
T4 Enable
RW
This bit enable T4 when auto-negotiation is
disabled.
1 = Enable T4 technology
0 = Disable T4 technology
disabled.
1 = Enable T4 technology
0 = Disable T4 technology
0
13
CRS Disconnect Control
RW
This bit controls the RX100 CRS disconnect
function in repeater mode.
NOTE: This bit should always equal 0 for the
function in repeater mode.
NOTE: This bit should always equal 0 for the
82559.
0 = DTE
1 = Rptr
1 = Rptr
12
Reserved
This bit is reserved.
0
11
RCV De-Serializer In-
Sync Indication
Sync Indication
RO
This bit is used as the 100BASE-TX RCV De-
Serializer In Sync Indication
Serializer In Sync Indication
0
10
100 Power Down
RO
This bit provides 100BASE-T Power Down
Indication.
1 = Power down
0 = Normal operation
Indication.
1 = Power down
0 = Normal operation
0
9
10 Power Down
RO
This bit provides 10BASE-T Power Down
Indication.
1 = Power down
0 = Normal operation
Indication.
1 = Power down
0 = Normal operation
0
8
Polarity
RO
This bit indicates 10BASE-T polarity.
1 = Reverse polarity
0 = Normal polarity
1 = Reverse polarity
0 = Normal polarity
0
7:3
Reserved
These bits are reserved.
0
2
T4
RO
This bit is a result of the auto-negotiation process.
1 = 100BASE-T4.
0 = No 100BASE-T4
1 = 100BASE-T4.
0 = No 100BASE-T4
0
1
Speed
RO
This bit is a result of the auto-negotiation process.
1 = 100 Mbps
0 = 10 Mbps
1 = 100 Mbps
0 = 10 Mbps
0
0
Duplex
RO
This bit is a result of the auto-negotiation process.
1 = Full duplex
0 = Half duplex
1 = Full duplex
0 = Half duplex
0