Ethernet (ETH): media access control (MAC) with DMA controller RM0008
989/1128 DocID13902 Rev 15
Inverse filtering operation
For both destination and source address filtering, there is an option to invert the filter-match
result at the final output. These are controlled by the DAIF and SAIF bits in the Frame filter
register, respectively. The DAIF bit is applicable for both Unicast and Multicast DA frames.
The result of the unicast/multicast destination address filter is inverted in this mode.
Similarly, when the SAIF bit is set, the result of the unicast SA filter is inverted. Table 214
and Table 215 summarize destination and source address filtering based on the type of
frame received.
Table 214. Destination address filtering
Frame
type
PM HPF HU DAIF HM PAM DB DA filter operation
Broadcast
1XXX X XXPass
0XXX X X0Pass
0XXX X X1Fail
Unicast
1 X X X X X X Pass all frames
0 X 0 0 X X X Pass on perfect/group filter match
0 X 0 1 X X X Fail on perfect/Group filter match
0 0 1 0 X X X Pass on hash filter match
0 0 1 1 X X X Fail on hash filter match
011 0 X XX
Pass on hash or perfect/Group filter
match
0 1 1 1 X X X Fail on hash or perfect/Group filter match
Multicast
1 X X X X X X Pass all frames
X X X X X 1 X Pass all frames
0XX0 0 0 X
Pass on Perfect/Group filter match and
drop PAUSE control frames if PCF = 0x
00X0 1 0 X
Pass on hash filter match and drop
PAUSE control frames if PCF = 0x
01X0 1 0 X
Pass on hash or perfect/Group filter
match and drop PAUSE control frames if
PCF = 0x
0XX1 0 0 X
Fail on perfect/Group filter match and
drop PAUSE control frames if PCF = 0x
00X1 1 0 X
Fail on hash filter match and drop PAUSE
control frames if PCF = 0x
01X1 1 0 X
Fail on hash or perfect/Group filter match
and drop PAUSE control frames if PCF =
0x
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