Datasheet

KSZ8041NL/RNL
DS00002245B-page 36  2017 Microchip Technology Inc.
1e:6:0 Reserved — — —
Register 1Fh – PHY Control 2
1f:15 HP_MDIX
0 = Auto MDI/MDI-X mode
1 = HP Auto MDI/MDI-X mode
RW 1
1f:14 MDI/MDI-X Select
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
Transmit on RX+/- (pins 5,4) and
Receive on TX+/- (pins 7, 6)
RW 0
1f:13 Pair Swap Disable
1 = Disable auto MDI/MDI-X
0 = Enable auto MDI/MDI-X
RW 0
1f.12 Energy Detect
1 = Presence of signal on RX+/-
analog wire pair
0 = No signal detected on RX+/-
RO 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
Register 1Fh – PHY Control 2 (Continued)
1f.10 Power Saving
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.
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 Auto-Negotiation Complete
1 = Auto-negotiation process
completed
0 = Auto-negotiation process not
completed
RW 0
1f.6
Enable Pause (Flow Con-
trol)
1 = Flow control capable
0 = No flow control capability
RO 0
1f.5 PHY Isolate
1 = PHY in isolate mode
0 = PHY in normal operation
RO 0
1f.4:2 Operation Mode Indication
[000] = Still in auto-negotiation
[001] = 10 BASE-T half-duplex
[010] = 100 BASE-TX half-duplex
[011] = Reserved
[101] = 10 BASE-T full-duplex
[110] = 100 BASE-TX full-duplex
[111] = Reserved
RO 000
TABLE 4-2: REGISTER DESCRIPTIONS (CONTINUED)
Address Name Description
Mode
(Note 4-1)
Default