Information

Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 16-131
16.6.2.7.1 Destination Address Recognition and Frame Filtering
The eTSEC can perform layer 2 frame filtering on the basis of destination Ethernet address (DA), as
illustrated by the flowchart in Figure 16-121.
Figure 16-121. Ethernet Address Recognition Flowchart
In promiscuous mode, the eTSEC accepts all received frames regardless of DA. Note, however, that
Ethernet frame filtering simply restricts the traffic seen by the receive queue filer. Therefore even in
I/G Address?
IG
Receive Frame
Incoming
Frame
Discard Frame
Station
Addr. Match?
T
Broadcast
Reject?
Exact
Addr. Enable?
Search of
Exact Match MAC
Address Table
Exact
Addr. Match?
T
T
F
RCTRL
[GHTX]?
F
F
Hash Search
of Individual
Address Table
Hash Match?
F
0
T
Broadcast
Address?
T
F
T
1
F
Hash Search
of Group/Extended
Address Table
Hash Match?
T
F
Promiscuous
T
F
Mode?