SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Revision 1.4 (08-19-08)

370

SMSC LAN9311/LAN9311i

 

This register is used in conjunction with the 

 and contains the last 32 bits of ALR data to be manually written via the Make

Entry command in the 

.

Register #:

1802h

Size:

32 bits

31:25

RO

-

24

Valid
When set, this bit makes the entry valid. It can be cleared to invalidate a 
previous entry that contained the specified MAC address.

R/W

0b

23

Age/Override
This bit is used by the aging and forwarding processes.

If the Static bit of this register is cleared, this bit should be set so that the 
entry will age in the normal amount of time.

If the Static bit is set, this bit is used as a port state override bit. When set, 
packets received with a destination address that matches the MAC address 
in the SWE_ALR_WR_DAT_1 and SWE_ALR_WR_DAT_0 registers will be 
forwarded regardless of the port state of the ingress or egress port(s). This 
is typically used to allow the reception of BPDU packets in the non-
forwarding state.

R/W

0b

22

Static
When this bit is set, this entry will not be removed by the aging process 
and/or be changed by the learning process. When this bit is cleared, this 
entry will be automatically removed after 5 to 10 minutes of inactivity. 
Inactivity is defined as no packets being received with a source address that 
matches this MAC address. 

This bit is normally set when adding manual entries. It must be 
cleared when removing an entry (clearing the Valid bit).

R/W

0b

21

Filter
When set, packets with a destination address that matches this MAC 
address will be filtered.

R/W

0b

20:19

Priority
These bits specify the priority that is used for packets with a destination 
address that matches this MAC address. This priority is only used if the 
Static bit of this register is set, and the DA Highest Priority (bit 5) in the 

 is set.

R/W

00b