AX88180 datasheet(22/47 Pages) ASIX

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AX88180

ASIX ELECTRONICS CORPORATION

1 = enable

0 = disable

GIGA_EN

R/W

Gigabit Mode Enable

When this bit is enabled, MAC will operate in 1000Mbps mode.

1 = enable

0 = disable

RXJUMBO

R/W

RX Jumbo Enable

When this bit is enabled, MAC will receive jumbo package

1 = enable

0 = disable

10:7

RXJUBOLEN R/W

0000

Length Limit of received Jumbo package

This field defines the maximum length of received jumbo package.

0001: 1K bytes

0010: 2K bytes

0011: 3K bytes

---------------------

1110: 14K bytes

1111: 15K bytes

DUPLEX

R/W

Duplex Mode.

1 = Full-Duplex mode

0 = Half-Duplex mode

TXFLW_EN

R/W

TX Flow Enable

When this bit is enabled, MAC will block the transmitted operation when it

captures pause frame from Ethernet. The re-transmission will be activated

until the waiting time is expired.

1 = enable

0 = disable

4:2

R/W

000

Reserved, must set to ‘0s’ for normal operation

RGMIIEN

R/W

RGMII Mode Enable

When this bit is enabled, AX88180 will operate in RGMII interface. Driver

must set external PHY to RGMII mode and enable this bit in initial stage.

Driver also must set RGMII interface of external PHY with add-delay

timing in its internal.

1 = enable

0 = disable

R/W

Reserved, must set to ‘0s’ for normal operation

4.16 MAC_CFG2--MAC Configuration2 Register

Offset Address = 0xFC48

Default = 0x0000_0100

Field

Name

Type

Default

Description

15:8

R/W

0x01

Reserved, keep this field in default value for normal operation.

7:2

JamLT

R/W

000000

Define Jam Limit for backpressure collision account.

Normally set this field at 0x19. It can avoid HUB port going to partition state due to

too many collisions. AX88180 will skip one frame collision backpressure when

collision counter equal to JamLT. The collision count will be reset to zero when

every transmit frame with no collision or receive a frame with no backpressure

collision.

1:0

R/W

Reserved, must set to ‘00’ for normal operation

AX88180 Datasheet(PDF) 22 Page - ASIX Electronics Corporation

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