Datasheet

KSZ8081MNX/RNB
DS00002202C-page 44 2016-2018 Microchip Technology Inc.
Register 1Fh – PHY Control 2
1F.15 HP_MDIX
1 = HP Auto MDI/MDI-X mode
0 = Auto MDI/MDI-X mode
RW 1
1F.14
MDI/MDI-X
Select
When Auto MDI/MDI-X is disabled,
1 = MDI-X mode
Transmit on RXP,RXM (pins 5, 4)
andReceive on TXP,TXM (pins 7, 6)
0 = MDI mode
Transmit on TXP,TXM (pins 7, 6) and
Receive on RXP,RXM (pins 5, 4)
RW 0
1F.13
Pair Swap
Disable
1 = Disable Auto MDI/MDI-X
0 = Enable Auto MDI/MDI-X
RW 0
1F.12 Reserved Reserved RW 0
1F.11 Force Link
1 = Force link pass
0 = Normal link operation
This bit bypasses the control logic
and allows the transmitter to send a
pattern even if there is no link.
RW 0
1F.10 Power Saving
1 = Enable power saving
0 = Disable power saving
RW 0
1F.9 Interrupt Level
1 = Interrupt pin active high
0 = Interrupt pin active low
RW 0
1F.8 Enable Jabber
1 = Enable jabber counter
0 = Disable jabber counter
RW 1
1F.7
RMII Refer-
ence Clock
Select
1 = RMII 50 MHz clock mode; clock
input to XI (Pin 9) is 50 MHz
0 = RMII 25 MHz clock mode; clock
input to XI (Pin 9) is 25
MHz
This bit applies only to
KSZ8081RNB.
RW 0
1F.6 Reserved Reserved RW 0
1F.5:4 LED Mode
[00] =LED1: Speed
LED0: Link/Activity
[01] = LED1: Activity
LED0: Link
[10], [11] = Reserved
RW 00
1F.3
Disable
Transmitter
1 = Disable transmitter
0 = Enable transmitter
RW 0
1F.2
Remote
Loopback
1 = Remote (analog) loopback is
enabled
0 = Normal mode
RW 0
1F.1
Enable SQE
Test
1 = Enable SQE test
0 = Disable SQE test
RW 0
1F.0
Disable Data
Scrambling
1 = Disable scrambler
0 = Enable scrambler
RW 0
TABLE 4-2: REGISTER DESCRIPTION (CONTINUED)
Address Name Description Mode Default