Datasheet

2016-2018 Microchip Technology Inc. DS00002202C-page 43
KSZ8081MNX/RNB
Register 1Dh – LinkMD Control/Status
1D.15
Cable Diag-
nostic Test
Enable
1 = Enable cable diagnostic test.
After test has completed, this bit is
self-cleared.
0 = Indicates cable diagnostic test (if
enabled) has completed and the sta
-
tus information is valid for read.
RW/SC 0
1D.14:13
Cable Diag-
nostic Test
Result
[00] = Normal condition
[01] = Open condition has been
detected in cable
[10] = Short condition has been
detected in cable
[11] = Cable diagnostic test has
failed
RO 00
1D.12
Short Cable
Indicator
1 = Short cable (<10 meter) has
been detected by LinkMD
RO 0
1D.11:9 Reserved Reserved RW 000
1D.8:0
Cable Fault
Counter
Distance to fault RO 0_0000_0000
Register 1Eh – PHY Control 1
1E.15:1
0
Reserved Reserved RO
0000_00
1E.9
Enable
Pause (Flow
Control)
1 = Flow control capable
0 = No flow control capability
RO
0
1E.8 Link Status
1 = Link is up
0 = Link is down
RO
0
1E.7
Polarity
Status
1 = Polarity is reversed
0 = Polarity is not reversed
RO
1E.6 Reserved Reserved RO
0
1E.5
MDI/MDI-X
State
1 = MDI-X
0 = MDI
RO
1E.4
Energy
Detect
1 = Signal present on receive
differential pair
0 = No signal detected on receive
differential pair
RO
0
1E.3 PHY Isolate
1 = PHY in isolate mode
0 = PHY in normal operation
RO
0
1E.2:0
Operation
Mode
Indication
[000] = Still in auto-negotiation
[001] = 10BASE-T half-duplex
[010] = 100BASE-TX half-duplex
[011] = Reserved
[100] = Reserved
[101] = 10BASE-T full-duplex
[110] = 100BASE-TX full-duplex
[111] = Reserved
RO
000
TABLE 4-2: REGISTER DESCRIPTION (CONTINUED)
Address Name Description Mode Default