PXN20RM Datasheet, PDF (602/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Fast Ethernet Controller (FEC)
Accept/Reject
Frame
True _{Broadcast Addr} False
?
Receive
Address
Recognition
False _{BC_REJ = 1}
?
Receive Frame
True
Set BC bit in RxBD
Hash Match ^True
?
False
Receive Frame
Set MC bit in RxBD if multicast
Exact Match ^True
?
False
Pause Frame ^True
?
False _{PROM = 1} True
?
False
Reject Frame
Flush from FIFO
Reject Frame
Receive Frame
Receive Frame
Flush from FIFO _{Set M (Miss) bit in RxBD}
Set MC bit in RxBD if multicast
Set BC bit in RxBD if broadcast
NOTES:
BC_REJ - field in RCR register (BroadCast REJect)
PROM - field in RCR register (PROMiscuous mode)
Pause Frame - valid Pause frame received
Figure 25-26. Ethernet Address Recognition—Receive Block Decisions
25-36
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor