Datasheet

Micrel, Inc.
KSZ8081MNX/KSZ8081RNB
August
19, 2015 47
Revision 1.4
Register Description (Continued)
Address Name Description Mode
(10)
Default
Register 16h – Operation Mode Strap Override
16.8 Reserved Reserved RW 0
16.7
MII B-to-B
Override
1 = Override strap-in for MII back-to-back mode
(also set Bit 0 of this register to ‘1’)
This bit applies only to KSZ8081MNX.
RW 0
16.6
RMII B-to-B
Override
1 = Override strap-in for RMII Back-to-Back
mode (also set Bit 1 of this register to ‘1’)
This bit applies only to KSZ8081RNB.
RW 0
16.5
NAND Tree
Override
1 = Override strap-in for NAND tree mode RW 0
16.4:2 Reserved Reserved RW 0_00
16.1 RMII Override
1 = Override strap-in for RMII mode
This bit applies only to KSZ8081RNB.
RW 0
16.0 MII Override
1 = Override strap-in for MII mode
This bit applies only to KSZ8081MNX.
RW 1
Register 17h – Operation Mode Strap Status
17.15:13
PHYAD[2:0]
Strap-In Status
[000] = Strap to PHY Address 0
[001] = Strap to PHY Address 1
[010] = Strap to PHY Address 2
[011] = Strap to PHY Address 3
[100] = Strap to PHY Address 4
[101] = Strap to PHY Address 5
[110] = Strap to PHY Address 6
[111] = Strap to PHY Address 7
RO
17.12:10 Reserved Reserved RO
17.9
B-CAST_OFF
Strap-In Status
1 = Strap to B-CAST_OFF
If bit is ‘1’, PHY Address 0 is non-broadcast.
RO
17.8 Reserved Reserved RO
17.7
MII B-to-B
Strap-In Status
1 = Strap to MII back-to-back mode
This bit applies only to KSZ8081MNX.
RO
17.6
RMII B-to-B
Strap-In Status
1 = Strap to RMII Back-to-Back mode
This bit applies only to KSZ8081RNB.
RO
17.5
NAND Tree
Strap-In Status
1 = Strap to NAND tree mode RO
17.4:2 Reserved Reserved RO
17.1
RMII Strap-In
Status
1 = Strap to RMII mode
This bit applies only to KSZ8081RNB.
RO
17.0
MII Strap-In
Status
1 = Strap to MII mode
This bit applies only to KSZ8081MNX.
RO