K60P100M100SF2RM Datasheet, PDF (1189/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 44 10/100-Mbps Ethernet MAC (ENET)
If promiscuous mode is enabled (ENETn_RCR[PROM] = 1) all unicast and multicast
frames are accepted regardless of ENETn_GAUR/GALR and ENETn_IAUR/IALR
settings.
44.4.4.3.3 Broadcast Address Reject
All broadcast frames are accepted if BC_REJ is cleared or ENETn_RCR[PROM] is set.
If PROM is cleared when ENETn_RCR[BC_REJ] is set, all broadcast frames are
rejected.
Table 44-75. Broadcast Address Reject Programming
PROM
0
0
1
1
BC_REJ
0
1
0
1
Broadcast Frames
Accepted
Rejected
Accepted
Accepted
44.4.4.3.4 Miss-Bit Implementation
For higher layer filtering purposes, RxBD[M] indicates an address miss when the MAC
operates in promiscuous mode and accepted a frame that would otherwise be rejected.
If a group/individual hash or exact match does not occur and promiscuous mode is
enabled (RCR[PROM] = 1), the frame is accepted and the M bit is set in the buffer
descriptor; otherwise, the frame is rejected.
This means the status bit is set in any of the following conditions during promiscuous
mode:
• A broadcast frame is received when BC_REJ is set.
• A unicast is received that does not match either of:
• Node address (PALR[PADDR1] and PAUR[PADDR2])
• Hash table for unicast (IAUR[IADDR1] and IALR[IADDR2])
• A multicast is received that does not match the GAUR[GADDR1] and
GALR[GADDR2] hash table entries
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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