Functional Description
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14.3.2.7.1.2 Multicast Address Table Entry
Table 14-12. Multicast Address Table Entry Bit Values
71:70 68:66 65 64 63:62 61:60 59:48 47:0
Reserved Port Mask Super Reserved Mcast Fwd Entry Type Reserved Multicast
State (01) Address
Table Entry Type
00: Free Entry
01: Address Entry : unicast or multicast determined by dest address bit 40 .
10: VLAN entry
11: VLAN Address Entry : unicast or multicast determined by address bit 40.
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.
01: Address entry. Unicast or multicast determined by address bit 40.
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.
14.3.2.7.1.3 VLAN/Multicast Address Table Entry
Table 14-13. VLAN/Multicast Address Table Entry Bit Values
71:69 68:66 65 64 63:62 61:60 59:48 47:0
Reserved Port Mask Super Reserved Mcast Fwd Entry Type vlan_id Multicast
State (11) Address
1196
Ethernet Subsystem SPRUH73H–October 2011–Revised April 2013
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