KSZ8795CLX
TABLE 4-4:
Address
PORT REGISTERS (CONTINUED)
Name
Description
Mode
Default
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
R/W
0
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.
5
Transmit Sniff
1 = All the packets transmitted on the port will be
marked as “monitored packets” and forwarded to
the designated “Sniffer port.”
R/W
R/W
0
0 = No transmit monitoring.
4 0
Port VLAN Membership Defines the port’s Port VLAN membership.
Bit[4] stands for Port 5,
0x1f
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.
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.
R/W
0
0 = No replace packet’s priority filed with port
default tag priority filed of the port Control 3 Regis-
ter Bits[7:5].
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.
R/W
0
0 = No ingress VLAN filtering.
5
4
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
R/W
0
0
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)
3
2
Back Pressure Enable 1 = Enable port half-duplex back pressure.
0 = Disable port half-duplex back pressure.
R/W
R/W
0
1
Transmit Enable
1 = Enable packet transmission on the port.
0 = Disable packet transmission on the port.
2016 Microchip Technology Inc.
DS00002112A-page 55
MICREL [ MICREL SEMICONDUCTOR ]
