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GD82559ER — Networking Silicon
66
Datasheet
9.1.2 Register 1: Status Register Bit Definitions
9 Restart Auto-
Negotiation
This bit restarts the Auto-Negotiation process and is self-
clearing.
1 = Restart Auto-Negotiation process
0RW
SC
8 Duplex Mode This bit controls the duplex mode when Auto-Negotiation
is disabled. If the PHY reports that it is only able to
operate in one duplex mode, the value of this bit shall
correspond to the mode which the PHY can operate.
When the PHY is placed in Loopback mode, the behavior
of the PHY shall not be affected by the status of this bit,
bit 8.
1 = Full Duplex
0 = Half Duplex
0RW
7 Collision Test This bit will force a collision in response to the assertion
of the transmit enable signal.
1 = Force COL
0 = Do not force COL
0RW
6:0 Reserved These bits are reserved and should be set to 0000000b. 0 RW
Bit(s) Name Description Default R/W
15 Reserved This bit is reserved and should be set to 0b. 0 RO
E
14 100BASE-TX Full
Duplex
1 = PHY able to perform full duplex 100BASE-TX 1 RO
13 100 Mbps Half
Duplex
1 = PHY able to perform half duplex 100BASE-TX 1 RO
12 10 Mbps Full
Duplex
1 = PHY able to operate at 10Mbps in full duplex
mode
1RO
11 10 Mbps Half
Duplex
1 = PHY able to operate at 10 Mbps in half duplex
mode
1RO
10:7 Reserved These bits are reserved and should be set to 0000b. 0 RO
6 Management
Frames Preamble
Suppression
0 = PHY will not accept management frames with
preamble suppressed
0RO
5 Auto-Negotiation
Complete
1 = Auto-Negotiation process completed
0 = Auto-Negotiation process has not completed
0RO
4 Remote Fault 0 = No remote fault condition detected 0 RO
3 Auto-Negotiation
Ability
1 = PHY is able to perform Auto-Negotiation 1 RO
2 Link Status 1 = Valid link has been established
0 = Invalid link detected
0RO
LL
1 Jabber Detect 1 = Jabber condition detected
0 = No jabber condition detected
0RO
LH
0 Extended
Capability
1 = Extended register capabilities enabled 1 RO
Bit(s) Name Description Default R/W