AX88780 datasheet(31/55 Pages) ASIX

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AX88780

ASIX ELECTRONICS CORPORATION

4.39 PROMCTRL--EEPROM Control Register

Offset Address= 0xFCB4

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:15

All 0’s

Reserved

14:12

ROM_CMD R/W

000

EEPROM Command Code.

Driver set this field to represent what type command will be send to EEPROM

device.

110

= read command

111

= erase command

101

= write command

ROM_WT

R/W

Write EEPROM

Set to ‘1’ to write EEPROM, it will be cleared when MAC finished the write

operation.

ROM_RD

R/W

Read EEPROM

Set to ‘1’ to read EEPROM, it will be cleared when MAC finished the read

operation. Driver can read PROMDPR register to get the returned data.

ROM_RLD

R/W

Reload EEPROM

Set to ‘1’ to re-load EEPROM, this bit will be cleared when MAC finished

loading operation.

Reserved

7:0

ROM_ADDR R/W

0x00

EEPROM Address

Set this field to define the address for serial EEPROM access. (only support

16-bit data access, 93C56 type)

4.40 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.

4.41 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. 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. For example, the hash table is

composite as {HASHTAB3[15:0], HASHTAB2[15:0], HASHTAB1[15:0],

HASHTAB0[15:0]}. If AX88780 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 AX88780.

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