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120 10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual
Physical Layer Interface
7.2.2 Status Register: Register 1
For maximum accuracy of link status, the Auto-Negatiation Complete bit (bit 5), should be polled
at a continuous interval of at least 300 milliseconds. After the Auto-Negotiation process has
completed, the sticky bit will be set to 1. When the Auto-Negotiation Complete bit equals 1, the
Link Status bit is updated for accuracy. Failure to delay the recommended time or using the Link
Status bit before a valid resolution of the Auto-Negotiation Complete bit can cause inaccurate
results.
8 Full/Half R/W
1= Full duplex
0 = Half duplex
0
7 Collision Test Enable R/W
This bit is valid only when the device in is in
loopback mode. When it is used for transmitting
broadcast frames, it increases the collision count
statistic. After the transmission collision test is
finished, the PHY should be reset to ensure it
returns to normal mode operation. (Using this bit
outside of loopback mode is inappropriate and may
cause unpredictable behavior.)
1 = enable the collision CDT test during loopback
0
6:0 Reserved R/W Written as 0, don't care on read 0
Bit Name R / W Description Default
Bit Name R / W Description Default
15 T4 capable RO
1= T4 capable
0 = Not T4 capable
0
14 TX full duplex capable RO
1= TX full duplex capable
0 = Not TX full duplex capable
1
13 TX half duplex capable RO
1 = TX half duplex capable
0 = Not TX half duplex capable
1
12
10BASE-T full duplex
capable
RO
1 = 10BASE-T full duplex capable
0 = Not 10BASE-T full duplex capable
1
11
10BASE-T half duplex
capable
RO
1 = 10BASE-T half duplex capable
0 = Not 10BASE-T half duplex capable
1
10:6 Reserved RO These bits are reserved and written as 0. 0
5
Auto-negotiation
complete
RO
1 = Auto-negotiation complete
0 = Auto-negotiation not complete
Sticky bit
4 Remote fault detect RO
1 = Remote fault detected
0 = Remote fault not detected
0
3 Auto-negotiation ability RO
1 = Auto-negotiation enabled
0 = Auto-negotiation disabled
1