KSZ8041NL/RNL
TABLE 4-2:
Address
1e:6:0
REGISTER DESCRIPTIONS (CONTINUED)
Name Description
Mode
(Note 4-1)
Default
Reserved
—
—
—
Register 1Fh – PHY Control 2
0 = Auto MDI/MDI-X mode
1 = HP Auto MDI/MDI-X mode
1f:15
HP_MDIX
RW
1
0
When Auto MDI/MDI-X is
disabled,
0 = MDI mode
Transmit on TX+/- (pins 7, 6) and
Receive on RX+/- (pins 5, 4)
1 = MDI-X mode
1f:14
MDI/MDI-X Select
RW
Transmit on RX+/- (pins 5,4) and
Receive on TX+/- (pins 7, 6)
1 = Disable auto MDI/MDI-X
0 = Enable auto MDI/MDI-X
1f:13
1f.12
Pair Swap Disable
Energy Detect
RW
RO
0
0
1 = Presence of signal on RX+/-
analog wire pair
0 = No signal detected on RX+/-
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.
1f.11
Force Link
RW
0
Register 1Fh – PHY Control 2 (Continued)
1 = Enable power saving
0 = Disable power saving
If power saving mode is enabled
and the cable is disconnected,
the RXC clock output (in MII
mode) is disabled. RXC clock is
enabled after the cable is con-
nected and a link is established.
1f.10
Power Saving
RW
0
1 = Interrupt pin active high
0 = Interrupt pin active low
1f.9
1f.8
Interrupt Level
Enable Jabber
RW
RW
0
1
1 = Enable jabber counter
0 = Disable jabber counter
1 = Auto-negotiation process
completed
0 = Auto-negotiation process not
completed
1f.7
Auto-Negotiation Complete
RW
0
Enable Pause (Flow Con-
trol)
1 = Flow control capable
0 = No flow control capability
1f.6
1f.5
RO
RO
0
0
1 = PHY in isolate mode
0 = PHY in normal operation
PHY Isolate
[000] = Still in auto-negotiation
[001] = 10 BASE-T half-duplex
[010] = 100 BASE-TX half-duplex
[011] = Reserved
1f.4:2
Operation Mode Indication
RO
000
[101] = 10 BASE-T full-duplex
[110] = 100 BASE-TX full-duplex
[111] = Reserved
DS00002245B-page 36
2017 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
