AX88180 datasheet(19/47 Pages) ASIX

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AX88180

ASIX ELECTRONICS CORPORATION

transmission is finished, AX88180 will auto-clear this bit.

TXD2O

R/W

TX Descriptor 2 Occupied

Driver set this bit to ‘1’ to indicate that it had used TX descriptor2. When the

transmission is finished, AX88180 will auto-clear this bit.

TXD1O

R/W

TX Descriptor 1 Occupied

Driver set this bit to ‘1’ to indicate that it had used TX descriptor1. When the

transmission is finished, AX88180 will auto-clear this bit.

TXD0O

R/W

TX Descriptor 0 Occupied

Driver set this bit to ‘1’ to indicate that it had used TX descriptor0. When the

transmission is finished, AX88180 will auto-clear this bit.

4.7 TXDES0--TX Descriptor0 Register

Offset Address = 0xFC20

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

TXD0_EN

R/W

Transmit TX descriptor 0

If this bit is enabled, MAC will begin to transmit data that are stored in TX

buffer. In former, driver had already written data that is assigned to TX

descriptor0 to TX buffer. This bit will be cleared by hardware when MAC

finished the transmission.

1= enable

0= disable

14:13

Reserved

12:0

TXD0_LEN

R/W

All 0’s

TX packet length (unit: byte)

Driver set this field to indicate AX88180 how many bytes will be

transmitted.

4.8 TXDES1--TX Descriptor1 Register

Offset Address = 0xFC24

Default = 0x0000_0000

Field

Name

Type

Default

Description

31:16

All 0’s

Reserved

TXD1_EN

R/W

Transmit TX descriptor 1

If this bit is enabled, MAC will begin to transmit data that are stored in TX

buffer. In former, driver had already written data that is assigned to TX

descriptor1 to TX buffer. This bit will be cleared by hardware when MAC

finished the transmission.

1= enable

0= disable

14:13

Reserved

12:0

TXD1_LEN

R/W

All 0’s

TX packet length (unit: byte)

Driver set this field to indicate AX88180 how many bytes will be

transmitted.

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