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Functional Description
Supervisory Packet (SUPER)
When set, this field indicates that the packet with a matching multicast destination address is a
supervisory packet.
0: Non-supervisory packet
1: Supervisory packet
Port Mask(2:0) (PORT_MASK)
This three bit field is the port bit mask that is returned with a found multicast destination address. There
may be multiple bits set indicating that the multicast packet may be forwarded to multiple ports (but not the
receiving port).
Multicast Forward State (MCAST_FWD_STATE)
Multicast Forward State – Indicates the port state(s) required for the received port on a destination
address lookup in order for the multicast packet to be forwarded to the transmit port(s). A transmit port
must be in the Forwarding state in order to forward the packet. If the transmit port_mask has multiple set
bits then each forward decision is independent of the other transmit port(s) forward decision.
00 – Forwarding
01 – Blocking/Forwarding/Learning
10 – Forwarding/Learning
11 – Forwarding
The forward state test returns a true value if both the Rx and Tx ports are in the required state.
Table Entry Type (ENTRY_TYPE)
Address entry type. Unicast or multicast determined by address bit 40.
11: VLAN address entry. Unicast or multicast determined by address bit 40.
VLAN ID (VLAN_ID)
The unique identifier for VLAN identification. This is the 12-bit VLAN ID.
Packet Address (MULTICAST_ADDRESS)
This is the 48-bit packet MAC address. For an OUI address, only the upper 24-bits of the address are
used in the source or destination address lookup. Otherwise, all 48-bits are used in the lookup.
14.3.2.7.1.4 Unicast Address Table Entry
Table 14-14. Unicast Address Table Entry Bit Values
71:70 69 68 67:66 65 64 63:62 61:60 59:48 47:0
Reserved DLR Reserved Port Block Secure Unicast Entry Type Reserved Unicast
Unicast Number Type (00) (01) Address
or (X1)
DLR Unicast
DLR Unicast – When set, this bit indicates that the address is a Device Level Ring (DLR) unicast address.
Received packets with a matching destination address will be flooded to the vlan_member_list (minus the
receive port and the host port). The port_number field is a don’t care when this bit is set. Matching packets
received on port 1 egress on port 2. Matching packets received on port 2 egress on port 1. Matching
packets received on port 0 egress on ports 1 and 2.
Port Number (PORT_NUMBER)
Port Number – This field indicates the port number (not port mask) that the packet with a unicast
destination address may be forwarded to. Packets with unicast destination addresses are forwarded only
to a single port (but not the receiving port).
1197
SPRUH73H–October 2011–Revised April 2013 Ethernet Subsystem
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