AX88180 datasheet(29/47 Pages) ASIX

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AX88180

ASIX ELECTRONICS CORPORATION

4.39 MAXRXLEN--Max. RX Packet Length Register

Offset Address= 0xFCB8

Default = 0x0000_0600

Field

Name

Type

Default

Description

31:11

All 0’s

Reserved

10:0

RXLEN R/W

0x600

Max RX Packet length

This field defines the max length of received packet. It doesn’t include 4-byte

CRC.

4.40 HASHTAB0--Hash Table0 Register

Offset Address = 0xFCC0

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB0

R/W

0x0000

Hash table:

bit15~bit0

Driver sets HASHTAB0, HASHTAB1, HASHTAB2 and HASHTAB3 to define

64-bit hash table. AX88180 will refer this table to check multicast packet if

multicast filter is enabled (bit4 of RXFILTER) for RX. When AX88180 receives

a packet then it extracts the destination address (DA). The DA is calculated by

CRC32 algorithm. After the operation, AX88180 will grab the MSB[31:27] of

result as hash table index. The range of index is from 0 to 63. For example, the

hash

table

composite

{HASHTAB3[15:0],

HASHTAB2[15:0],

HASHTAB1[15:0], HASHTAB0[15:0]}. If AX88180 detects the MSB[31:27] =

26 of CRC32 of DA for someone multicast packet, and driver set ‘1’ to

HASHTAB1[10], then the multicast packet will received by AX88180.

4.41 HASHTAB1--Hash Table1 Register

Offset Address = 0xFCC4

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB1

R/W

0x0000

Hash table:

bit31~bit16

4.42 HASHTAB2--Hash Table2 Register

Offset Address = 0xFCC8

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB2

R/W

0x0000

Hash table: bit47~bit32

4.43 HASHTAB3--Hash Table3 Register

Offset Address = 0xFCCC

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB3

R/W

0x0000

Hash table: bit63 ~ bit48

AX88180 Datasheet(PDF) 29 Page - ASIX Electronics Corporation

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