MPC8280 datasheet(799/1386 Pages) FREESCALE

799 / 1386 page

SCC Ethernet Mode

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

25-11

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.

Figure 25-4. 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

Check Address

I/G Address

Hash_Search

False

True

Multiple IND

Broadcast

Address

Use Indicated

Table

Hash Search

Use Group

Table

Match

Receive Frame

Ignore REJECT

Receive Frame

Ignore REJECT

Match

Receive Frame

Ignore REJECT

PROMISC

Start Receive

Discard Frame if REJECT

Discard Frame

is Asserted

True

False

True

False

Broadcast

Enabled

True

False

Multiple Individual

Addresses

Single

Address

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