8101 datasheet(37/172 Pages) LSI

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Receive MAC

2-19

If the bit selected in (3) is a "one" the destination address passes the

ﬁlter; otherwise, the address fails the ﬁlter and the packet is rejected

and discarded.

Note:

If all 64 bits of the address ﬁlter are programmed to all

ones, the address ﬁlter passes all multicast addresses.

Setting the REJMCST bit in “Register 8–Conﬁguration 2‚" Section 4.3.9,

programs the controller to reject all multicast packets regardless of their

address. When this bit is set all multicast packets are rejected regardless

of their address.

Multicast packet address ﬁltering functions do not affect the reception of

MAC control frames. Other bits described in Section 2.17, “MAC Control

Frames,” control the reception of MAC control frames.

2.8.5 Broadcast Address Filter

The controller does not do any ﬁltering on broadcast packets. To program

the controller to reject all broadcast packets, set the REJBCST bit in

“Register 8–Conﬁguration 2‚" Section 4.3.9. When this bit is set all

broadcast packets are rejected regardless of their address.

Table 2.5

Multicast Address Filter Map

FCS Bits

[0:2]1

1. Bits 0

−5 are the six least-signiﬁcant bits of the CRC.

Address

Filter Byte2

2. F[7:0] are bytes in Address Filter 1

−4 Registers.

FCS Bits

[3:5]1

Address

Filter Bit3

3. Fx[7:0] are bits within each byte in Address Filter 1

−4 Registers.

000

F0[7:0]

000

Fx[0]

001

F1[7:0]

001

Fx[1]

010

F2[7:0]

010

Fx[2]

011

F3[7:0]

011

Fx[3]

100

F4[7:0]

100

Fx[4]

101

F5[7:0]

101

Fx[5]

110

F6[7:0]

110

Fx[6]

111

F7[7:0]

111

Fx[7]

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