FEC Registers—MBAR + 0x3000
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 14-25
Note: X: Bit is not reset and must be initialized.
14.5.18 FEC Descriptor Group Address 1 Register—MBAR + 0x3120
The GADDR1 register is written by the user. This register contains the upper 32bits of the 64-bit hash table used in the address recognition
process for receive frames with a multicast address. This register must be initialized.
Note: X: Bit is not reset and must be initialized.
14.5.19 FEC Descriptor Group Address 2 Register—MBAR + 0x3124
The GADDR2 register is written by the user. The GADDR2 register contains the lower 32bits of the 64-bit hash table used in the address
recognition process for receive frames with a multicast address. This register must be initialized.
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R IADDR2
W
RESET:X XXXXXXXX X X X XX X X
Bits Name Description
0:31 IADDR2 The lower 32bits of the 64-bit hash table used in the address recognition process for receive
frames with a unicast address.
Bit 31 contains hash index bit 31.
Bit 0 contains hash index bit 0.

Table14-27. FEC Descriptor Group Address 1 Register

msb 012345678 9 101112131415
R GADDR1
W
RESET:X XXXXXXXX X X X XX X X
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R GADDR1
W
RESET:X XXXXXXXX X X X XX X X
Bits Name Description
0:31 GADDR1 The GADDR1 register contains the upper 32bits of the 64-bit hash table used in the address
recognition process for receive frames with a multicast address.
Bit 31 contains hash index bit 63.
Bit 0 contains hash index bit 32.

Table14-28. FEC Descriptor Group Address 2 Register

msb 012345678 9 101112131415
R GADDR2
W
RESET:X XXXXXXXX X X X XX X X