Motorola MPC8260 PowerQUICC II User Manual page 680

Part IV. Communications Processor Module
True
Broadcast
True
Enabled
?
Receive Frame
Ignore REJECT
Figure 24-4. Ethernet Address Recognition Flowchart
In group address recognition, the controller determines whether the group address is a
broadcast address. If broadcast addresses are enabled, the frame is accepted, but if the
group address is not a broadcast address, address recognition can be performed on multiple
group addresses using the GADDRn hash table. In promiscuous mode, the controller
receives all incoming frames regardless of their address, unless REJECT is asserted.
If an external CAM is used for address recognition, select promiscuous mode; the frame
can be rejected by asserting REJECT while the frame is being received. The on-chip
address recognition functions can be used in addition to the external CAM address
recognition functions.
24-12
G
Broadcast False
Address
?
Hash Search
False
Use Group
Table
Match
?
False
False
PROMISC
?
Discard Frame
MPC8260 PowerQUICC II UserÕs Manual
Check Address
I
I/G Address
?
Multiple Individual
Addresses
Hash_Search
Use Indicated
Table
True True
Match
?
Receive Frame
Ignore REJECT
False
True
Start Receive
Discard Frame if REJECT
is Asserted
True
Multiple IND
?
False
Single
Address
False
Match
?
True
Receive Frame
Ignore REJECT
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