AX88780 datasheet(31/49 Pages) ASIX

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AX88780

4.41 HASHTAB0--Hash Table0 Register

Offset Address = FCC0h

Default = 32’h0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB0 R/W

16’h0000

Hash table: bit15~bit0

Driver sets HASHTAB0, HASHTAB1, HASHTAB2 and HASHTAB3 to

define 64-bit hash table. AX88780 will refer this table to check multicast

packet if multicast filter is enabled for RX. When AX88780 receives a packet

then it extracts the destination address (DA). The DA is calculated by CRC32

algorithm. After the operation, AX88780 will grab the MSB[31:27] of result

as hash table index. The range of index is from 0 to 63

4.42 HASHTAB1--Hash Table1 Register

Offset Address = FCC4h

Default = 32’h0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB1 R/W

16’h0000

Hash table: bit31~bit16

4.43 HASHTAB2--Hash Table2 Register

Offset Address = FCC8h

Default = 32’h0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB2 R/W

16’h0000

Hash table: bit47~bit32

4.44 HASHTAB3--Hash Table3 Register

Offset Address = FCCCh

Default = 32’h0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

HTAB3 R/W

16’h0000

Hash table: bit63 ~ bit48

4.45 DOGTHD0—Watch Dog Timer Threshold0 Register

Offset Address = FCE0h

Default = 32’h0000_FFFF

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:0

DOGTH0 R/W

16’hFFFF Watch Dog Timer Low Word

This register and DOGTHD1[7:0] are defined to an expired threshold in

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