High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.5.3.40 Switch Engine Interrupt Pending Register (SWE_IPR)
Register #:
1881h
Size:
32 bits
This register contains the Switch Engine interrupt status. The status is double buffered. All interrupts
in this register may be masked via the Switch Engine Interrupt Mask Register (SWE_IMR) register.
Refer to Chapter 5, "System Interrupts," on page 49 for more information.
BITS
DESCRIPTION
TYPE
DEFAULT
31:15
14:11
RESERVED
RO
RC
-
Drop Reason B
0h
When bit 8 is set, these bits indicate the reason a packet was dropped per
the table below:
BIT
VALUES
DESCRIPTION
0000
0001
Admit Only VLAN was set and the packet was untagged or priority tagged.
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.
0010
0011
0100
The destination address was found in the ALR table but the source port was
not in the forwarding state.
The destination address was found in the ALR table but the destination port
was not in the forwarding state.
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.
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.
0110
0111
Drop Unknown was set and the destination address was a unicast but not in
the ALR table.
Filter Multicast was set and the destination address was a multicast and not in
the ALR table.
1000
1001
The packet was a broadcast but exceeded the Broadcast Throttling limit.
The destination address was not in the ALR table (unknown or broadcast) and
the source port was not in the forwarding state.
1010
1011
The destination address was found in the ALR table but the source and
destination ports were the same.
The destination address was found in the ALR table and the Filter bit was set
for that address.
1100
1101
1110
1111
RESERVED
RESERVED
A packet was received with a VLAN ID of FFFh
RESERVED
Revision 1.2 (04-08-08)
410
SMSC LAN9312
DATASHEET
SMSC [ SMSC CORPORATION ]
