SMSC LAN9311 User Manual
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
411
Revision 1.4 (08-19-08)
DATASHEET
14.5.3.40
Switch Engine Interrupt Pending Register (SWE_IPR)
This register contains the Switch Engine interrupt status. The status is double buffered. All interrupts
in this register may be masked via the
in this register may be masked via the
register.
for more information.
Register #:
1881h
Size:
32 bits
BITS
DESCRIPTION
TYPE
DEFAULT
31:15
RESERVED
RO
-
14:11
Drop Reason B
When bit 8 is set, these bits indicate the reason a packet was dropped per
the table below:
When bit 8 is set, these bits indicate the reason a packet was dropped per
the table below:
RC
0h
BIT
VALUES
DESCRIPTION
0000
Admit Only VLAN was set and the packet was untagged or priority tagged.
0001
The destination address was not in the ALR table (unknown or broadcast),
Enable Membership Checking on ingress was set, Admit Non Member was
cleared and the source port was not a member of the incoming VLAN.
Enable Membership Checking on ingress was set, Admit Non Member was
cleared and the source port was not a member of the incoming VLAN.
0010
The destination address was found in the ALR table but the source port was
not in the forwarding state.
not in the forwarding state.
0011
The destination address was found in the ALR table but the destination port
was not in the forwarding state.
was not in the forwarding state.
0100
The destination address was found in the ALR table but Enable Membership
Checking on ingress was set and the destination port was not a member of the
incoming VLAN.
Checking on ingress was set and the destination port was not a member of the
incoming VLAN.
0101
The destination address was found in the ALR table but the Enable
Membership Checking on ingress was set, Admit Non Member was cleared and
the source port was not a member of the incoming VLAN.
Membership Checking on ingress was set, Admit Non Member was cleared and
the source port was not a member of the incoming VLAN.
0110
Drop Unknown was set and the destination address was a unicast but not in
the ALR table.
the ALR table.
0111
Filter Multicast was set and the destination address was a multicast and not in
the ALR table.
the ALR table.
1000
The packet was a broadcast but exceeded the Broadcast Throttling limit.
1001
The destination address was not in the ALR table (unknown or broadcast) and
the source port was not in the forwarding state.
the source port was not in the forwarding state.
1010
The destination address was found in the ALR table but the source and
destination ports were the same.
destination ports were the same.
1011
The destination address was found in the ALR table and the Filter bit was set
for that address.
for that address.
1100
RESERVED
1101
RESERVED
1110
A packet was received with a VLAN ID of FFFh
1111
RESERVED