AX88180 datasheet(27/47 Pages) ASIX

27 / 47 page

AX88180

ASIX ELECTRONICS CORPORATION

4.31 RXINDICATOR--Receive Indicator Register

Offset Address= 0xFC90

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:1

All 0’s

Reserved

RXSTART R/W

Receive Start

Driver sets this bit to start or end receive operation from RX buffer of AX88180.

1= Start read RX buffer

0= End read RX buffer

4.32 TXST--TX Status Register

Offset Address = 0xFC94

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:4

All 0’s

Reserved

TXD3FAIL R

TX Descriptor3 Transmit Fail

When this bit is set 1, it means AX88180 fails in transmission of descriptor3.

This bit will be self-cleared when driver reads TXST register.

TXD2FAIL R

TX Descriptor2 Transmit Fail

When this bit is set 1, it means A88180 fails in transmission of descriptor2.

This bit will be self-cleared when driver reads TXST register.

TXD1FAIL R

TX Descriptor1 Transmit Fail

When this bit is set 1, it means AX88180 fails in transmission of descriptor1.

This bit will be self-cleared when driver reads TXST register.

TXD0FAIL R

TX Descriptor0 Transmit Fail

When this bit is set 1, it means AX88180 fails in transmission of descriptor0.

This bit will be self-cleared when driver reads TXST register.

4.33 MDCLKPAT--MDC Clock Pattern Register

Offset Address = 0xFCA0

Default = 0x0000_8040

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

15:8

R/W

0x80

Reserved, must set to 0x80 for normal operation

7:0

MDCPAT R/W

0x40

MDC Clock Divide Factor

This field defines the divided factor of host clock. AX88180 will refer to this

field and generate a low speed clock to PHY.

4.34 RXCHKSUMCNT--RX IP/UDP/TCP Checksum Error Counter

Offset Address = 0xFCA4

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s Reserved

15:0

RXCHKERCNT R/W

All 0’s RX Checksum Error Counter

If the RXCHKSUM field of RX_CFG register is set to ‘1’, MAC will check the

checksum of IP, TCP or UDP packet. Whenever there is checksum error

detected, this field will be added one. The value will be rounded back to 0x0000

if it exceeds 0xFFFF.

AX88180 Datasheet(PDF) 27 Page - ASIX Electronics Corporation

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