Datasheet
KSZ9031RNX
DS00002117F-page 34 2016-2017 Microchip Technology Inc.
0.10 Isolate 1 = Electrical isolation of PHY from RGMII
0 = Normal operation
RW 0
0.9 Restart Auto-
Negotiation
1 = Restart auto-negotiation process
0 = Normal operation
This bit is self-cleared after a ‘1’ is written to it.
RW/SC 0
0.8 Duplex Mode 1 = Full-duplex
0 = Half-duplex
RW 1
0.7 Reserved Reserved RW 0
0.6 Speed Select
(MSB)
[0.6, 0.13]
[1,1] = Reserved
[1,0] = 1000 Mbps
[0,1] = 100 Mbps
[0,0] = 10 Mbps
This bit is ignored if auto-negotiation is enabled
(Reg. 0.12 = 1).
RW Set by MODE[3:0]
strapping pins.
See the Strap-In
Options -
KSZ9031RNX
section for details.
0.5:0 Reserved Reserved RO 00_0000
Register 1h - Basic Status
1.15 100BASE-T4 1 = T4 capable
0 = Not T4 capable
RO 0
1.14 100BASE-TX
Full-Duplex
1 = Capable of 100 Mbps full-duplex
0 = Not capable of 100 Mbps full-duplex
RO 1
1.13 100BASE-TX
Half-Duplex
1 = Capable of 100 Mbps half-duplex
0 = Not capable of 100 Mbps half-duplex
RO 1
1.12 10BASE-T
Full-Duplex
1 = Capable of 10 Mbps full-duplex
0 = Not capable of 10 Mbps full-duplex
RO 1
1.11 10BASE-T
Half-Duplex
1 = Capable of 10 Mbps half-duplex
0 = Not capable of 10 Mbps half-duplex
RO 1
1.10:9 Reserved Reserved RO 00
1.8 Extended
Status
1 = Extended status info in Reg. 15h.
0 = No extended status info in Reg. 15h.
RO 1
1.7 Reserved Reserved RO 0
1.6 No Preamble 1 = Preamble suppression
0 = Normal preamble
RO 1
1.5 Auto-Negoti-
ation Com-
plete
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
RO 0
1.4 Remote Fault 1 = Remote fault
0 = No remote fault
RO/LH 0
1.3 Auto-Negoti-
ation Ability
1 = Can perform auto-negotiation
0 = Cannot perform auto-negotiation
RO 1
1.2 Link Status 1 = Link is up
0 = Link is down
RO/LL 0
1.1 Jabber
Detect
1 = Jabber detected
0 = Jabber not detected (default is low)
RO/LH 0
1.0 Extended
Capability
1 = Supports extended capability registers RO 1
Register 2h - PHY Identifier 1
TABLE 4-3: IEEE-DEFINED REGISTER DESCRIPTIONS (CONTINUED)
Address Name Description
Mode
Note 4-1
Default