Datasheet
KSZ8795CLX
DS00002112B-page 56 2016-2017 Microchip Technology Inc.
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 trans-
mit 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 Defines the port’s Port VLAN membership.
Bit[4] stands for Port 5,
Bit[3] stands for Port 4,
Bit[2] stands for Port 3,
Bit[1] stands for Port 2,
Bit[0] stands 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 in the 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 regis-
ter, replace the packet’s “user priority field” with the
“user priority field” in the port default tag Register
Control 3.
0 = No replace packet’s priority filed with port
default tag priority filed of the port Control 3 Regis-
ter Bits[7:5].
R/W 0
6 Ingress VLAN Filtering. 1 = The switch will discard packets whose VID port
membership in VLAN table Bits[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
4 Force Flow Control 1 = Enables Rx and Tx flow control on the port,
regardless of the AN result.
0 = Flow control is enabled based on the AN result
(Default)
R/W 0
3 Back Pressure Enable 1 = Enable port half-duplex back pressure.
0 = Disable port half-duplex back pressure.
R/W 0
2 Transmit Enable 1 = Enable packet transmission on the port.
0 = Disable packet transmission on the port.
R/W 1
TABLE 4-4: PORT REGISTERS (CONTINUED)
Address Name Description Mode Default