Specifications

Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Port Registers (Continued)
Register 19 (0x13): Port 1 Control 3
Register 35 (0x23): Port 2 Control 3
Register 51 (0x33): Port 3 Control 3
Register 67 (0x43): Port 4 Control 3
Register 83 (0x53): Port 5 Control 3
Address Name Description Mode Default
7−0
Default Tag [15:8]
Port’s default tag, containing:
7-5: user priority bits
4: CFI bit
3-0 : VID[11:8]
R/W 0x00
Register 20 (0x14): Port 1 Control 4
Register 36 (0x24): Port 2 Control 4
Register 52 (0x34): Port 3 Control 4
Register 68 (0x44): Port 4 Control 4
Register 84 (0x54): Port 5 Control 4
Address Name Description Mode Default
7−0
Default Tag [7:0]
Default port 1’s tag, containing:
7-0: VID[7:0]
R/W 0x01
Note:
Registers 19 and 20 (and those corresponding to other ports) serve two purposes: (1) Associated with the ingress untagged packets, and used for
egress tagging; (2) Default VID for the ingress untagged or null-VID-tagged packets, and used for address look up.
Register 87 (0x57): RMII Management Control Register
Address Name Description Mode Default
7−4
Reserved N/A Do not change. RO 0000
3
Port 5 SW5-RMII 50MHz
clock output disable
(used for KSZ8895RQ
only)
Disable the output of port 5 SW5-RMII 50 MHz output
clock on RXC pin when 50MHz clock is not being used
by the device and the 50MHz clock from external
oscillator or opposite device in RMII mode
1 = Disable clock output when RXC pin is not used in
RMII mode
0 = Enable clock output in RMII mode
Note:MQ/FMQ is reserved with read only for this bit.
R/W 0
2
P5-RMII 50MHz clock
output disable
(used for KSZ8895RQ
only)
Disable the output of port 5 P5-RMII 50 MHz output
clock on RXC pin when 50MHz clock is not being used
by the device and the 50MHz clock from external
oscillator or opposite device in RMII mode
1 = Disable clock output when RXC pin is not used in
RMII mode
0 = Enable clock output in RMII mode
Note:MQ/FMQ is reserved with read only for this bit.
R/W 0
1−0
Reserved N/A Do not change. RO 00
March 12, 2014
68
Revision 1.7