Motorola PowerQUICC II MPC8280 Series Reference Manual page 840

SCC Ethernet Address Recognition
25.10 SCC Ethernet Address Recognition
The Ethernet controller can filter received frames based on different addressing
types—physical (individual), group (multicast), broadcast (all-ones group address), and
promiscuous. The difference between an individual address and a group address is
determined by the I/G bit in the destination address field. A flowchart for address
recognition on received frames is shown in Figure 25-4.
In the physical type of address recognition, the Ethernet controller compares the destination
address field of the received frame with the user-programmed physical address in
PADDR1. Address recognition can be performed on multiple individual addresses using
the IADDR1–4 hash table.
True
Broadcast
True
Enabled
?
Receive Frame
Ignore REJECT
Figure 25-4. Ethernet Address Recognition Flowchart
25-12
Freescale Semiconductor, Inc.
Broadcast False
Address
?
Hash Search
False
Use Group
Table
Match
False
PROMISC
Discard Frame
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Check Address
G
I/G Address
?
Multiple Individual
Addresses
Hash_Search
Use Indicated
True True
?
False
Receive Frame
Ignore REJECT
True
?
Start Receive
Discard Frame if REJECT
is Asserted
I
True
Multiple IND
?
False
Table
Single
Address
Match
?
False
False
Match
?
True
Receive Frame
Ignore REJECT
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