AN983 datasheet(45/91 Pages) ETC

45 / 91 page

AN983B

PCI/miPCI Fast Ethernet Controller with integrated PHY

For example, physical address = 00-00-e8-11-22-33

PAR0= 11 e8 00 00

PAR1= xx xx 33 22

PAR0 and PAR1 are readable, but can be written only if the receive state is in stopped (CSR5 bit19-17=000).

CSR27 (offset = ach) - MAR0, multicast address register 0

Bit #

Name

Descriptions

Default Val RW Type

31~24

MAB3

Multicast address byte 3 (hash table 31:24)

R/W

23~16

MAB2

Multicast address byte 2 (hash table 23:16)

R/W

15~8

MAB1

Multicast address byte 1 (hash table 15:8)

R/W

7~0

MAB0

Multicast address byte 0 (hash table 7:0)

R/W

CSR28 (offset = b0h) - MAR1, multicast address register 1

Bit #

Name

Descriptions

Default Val RW Type

31~24

MAB7

Multicast address byte 7 (hash table 63:56)

R/W

23~16

MAB6

Multicast address byte 6 (hash table 55:48)

R/W

15~8

MAB5

Multicast address byte 5 (hash table 47:40)

R/W

7~0

MAB4

Multicast address byte 4 (hash table 39:32)

R/W

MAR0 and MAR1 are readable, but can be written only if the receive state is in stopped (CSR5

bit19-17=000).

Multicast 64 Algorithm:

AN983B uses CRC [5:0] to hit one of the 64 entries in UMAR1 [31:0] and MAR0[31:0] by generated

CRC32 from Ethernet DA (destination address).

The most significant bit CRC [5] choose the upper or lower double word, (MAR1 or MAR0), the lower 5

bit present for the corresponding bit inside the double word.

Example 1:

If CRC [5] =1'b0 --> hit MAR0

CRC [4:0] = 5'b00010 --> hit MAR0 [2]

Example 2:

CRC [5] = 1'b1 --> hit MAR1

CRC [4:0] = 5'b00100--> hit MAR1 [4]

CSR_29 (offset = b4h) - UAR0, unicast address register 0

Bit #

Name

Descriptions

Default Val RW Type

31~24

UAB3

Unicast address byte 3 (hash table 31:24)

R/W

23~16

UAB2

Unicast address byte 2 (hash table 23:16)

R/W

15~8

UAB1

Unicast address byte 1 (hash table 15:8)

R/W

7~0

UAB0

Unicast address byte 0 (hash table 7:0)

R/W

ADMtek Inc.

www.admtek.com.tw

Rev. 1.8

AN983 数据表(PDF) 45 Page - List of Unclassifed Manufacturers

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