Datasheet
2016 Microchip Technology Inc. DS00002246A-page 55
KSZ8895MQX/RQX/FQX/MLX
0
Two Queues
Split Enable
This bit 0 in the Register16/32/48/64/80 should be
in combination with Register177/193/209/225/241
bit 1 for Port 1-5 will select the split of 1/2/4
queues:
For Port 1, [Register 177 bit 1, Register 16 bit 0] =
[11], Reserved
[10], the port output queue is split into four priority
queues or if map 802.1p to priority 0-3 mode.
[01], the port output queue is split into two priority
queues or if map 802.1p to priority 0-3 mode.
[00], single output queue on the port. There is no
priority differentiation even though packets are
classified into high or low priority.
R/W 0
Register 17 (0x11): Port 1 Control 1
Register 33 (0x21): Port 2 Control 1
Register 49 (0x31): Port 3 Control 1
Register 65 (0x41): Port 4 Control 1
Register 81 (0x51): Port 5 Control 1
7 Sniffer Port
1, port is designated as sniffer port and will transmit
packets that are monitored.
0, port is a normal port.
R/W 0
6 Receive Sniff
1, all the packets received on the port will be
marked as “monitored packets” and forwarded to
the designated “sniffer port.”
0, no receive monitoring.
R/W 0
5
Transmit
Sniff
1, all the packets transmitted on the port will be
marked as “monitored packets” and forwarded to
the designated “sniffer port.”
0, no transmit monitoring.
R/W 0
4 - 0
Port VLAN
Membership
Define the port’s Port VLAN membership. Bit 4
stands for Port 5, bit 3 for Port 4...bit 0 for Port 1.
The port can only communicate within the member-
ship. A ‘1’ includes a port in the membership, a ‘0’
excludes a port from membership.
R/W 0x1f
Register 18 (0x12): Port 1 Control 2
Register 34 (0x22): Port 2 Control 2
Register 50 (0x32): Port 3 Control 2
Register 66 (0x42): Port 4 Control 2
Register 82 (0x52): Port 5 Control 2
7
User Priority
Ceiling
1, If packet’s “user priority field” is greater than the
“user priority field” in the port default tag register,
replace the packet’s “user priority field” with the
“user priority field” in the port default tag Register
control 3.
0, no replacement of packet’s priority filed with port
default tag priority filed of the Register Port Control
3 bit [7:5].
R/W 0
6
Ingress
VLAN
Filtering.
1, the switch will discard packets whose VID port
membership in VLAN table bit [11:7] does not
include the ingress port.
0, no ingress VLAN filtering.
R/W 0
5
Discard Non-
PVID packets
1, the switch will discard packets whose VID does
not match ingress port default VID.
0, no packets will be discarded.
R/W 0
TABLE 4-3: PORT REGISTERS (CONTINUED)
Address Name Description Mode Default