Motorola ColdFire MCF5281 User Manual

Page 349

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Fast Ethernet Controller (FEC)

Freescale Semiconductor

17-39

The user must initialize the hash table registers. Use this CRC32 polynomial to compute the hash:

Eqn. 17-2

Table 17-37

contains example destination addresses and corresponding hash values.

Table 17-37. Destination Address to 6-Bit Hash

48-bit DA

6-bit Hash

(in hex)

Hash Decimal

Value

65FF_FFFF_FFFF

0x0

0

55FF_FFFF_FFFF

0x1

1

15FF_FFFF_FFFF

0x2

2

35FF_FFFF_FFFF

0x3

3

B5FF_FFFF_FFFF

0x4

4

95FF_FFFF_FFFF

0x5

5

D5FF_FFFF_FFFF

0x6

6

F5FF_FFFF_FFFF

0x7

7

DBFF_FFFF_FFFF

0x8

8

FBFF_FFFF_FFFF

0x9

9

BBFF_FFFF_FFFF

0xA

10

8BFF_FFFF_FFFF

0xB

11

0BFF_FFFF_FFFF

0xC

12

3BFF_FFFF_FFFF

0xD

13

7BFF_FFFF_FFFF

0xE

14

5BFF_FFFF_FFFF

0xF

15

27FF_FFFF_FFFF

0x10

16

07FF_FFFF_FFFF

0x11

17

57FF_FFFF_FFFF

0x12

18

77FF_FFFF_FFFF

0x13

19

F7FF_FFFF_FFFF

0x14

20

C7FF_FFFF_FFFF

0x15

21

97FF_FFFF_FFFF

0x16

22

A7FF_FFFF_FFFF

0x17

23

99FF_FFFF_FFFF

0x18

24

B9FF_FFFF_FFFF

0x19

25

F9FF_FFFF_FFFF

0x1A

26

C9FF_FFFF_FFFF

0x1B

27

X

32

X

26

X

23

X

22

X

16

X

12

X

11

X

10

X

8

X

7

X

5

X

4

X

2

X

1

+

+

+

+

+

+

+

+

+

+

+

+

+

+

MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3

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