AX88780 datasheet(20/49 Pages) ASIX

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AX88780

01: Descriptor 1 in transmitting

10: Descriptor 2 in transmitting

11: Descriptor 3 in transmitting

TXD3O

R/W

TX Descriptor3 Occupied

Driver set this bit to ‘1’ to indicate that it had used TX descriptor3. When the

transmission is finished, AX88780 will auto-clear this bit.

TXD2O

R/W

TX Descriptor2 Occupied

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

transmission is finished, AX88780 will auto-clear this bit.

TXD1O

R/W

TX Descriptor1 Occupied

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

transmission is finished, AX88780 will auto-clear this bit.

TXD0O

R/W

TX Descriptor0 Occupied

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

transmission is finished, AX88780 will auto-clear this bit.

4.7 PHY_CTRL-- Internal PHY Control Register

Offset Address = FC1Ch

Default = 32’h0000_0000

Field

Name

Type

Default

Description

31:13

All 0’s

Reserved

SPD_GPIO1

R/W

Speed LED or GPIO1

When this bit is enabled, pin54 is as speed indicator, otherwise it is as

GPIO1 function and controlled by GPIO_CTRL register.

1= enable

0= disable

LNK_GPIO0

R/W

Link LED or GPIO0

When this bit is enabled, pin55 is as link/traffic indicator, otherwise it is

as GPIO0 function and controlled by GPIO_CTRL register.

1 = enable

0 = disable

FUL_EECS

R/W

EECS Pin as Full-Duplex LED

When this bit is enabled, EECS pin will be as full-duplex indicator and

EEDI pin will be as collision indicator.

1 = enable

0 = disable

PWDN

R/W

Power down PHY

When this bit is enabled, AX88780 will power down internal PHY.

1 = enable

0 = disable

PHY_EN

R/W

PHY Selection

When this bit is enabled, AX88780 will select internal PHY, otherwise it

will select external PHY.

1 = enable

0 = disable

Reserved

6:4

PHYOPMODE

R/W

3’b000

Internal 10/100M PHY operation mode

Driver can set these bits to control internal PHY operation mode.

3’b000 = auto-negotiation enable with all capability

3’b001 = auto-negotiation with 100BASE-TX FDX/HDX ability

3’b010 = auto-negotiation with 10BASE-T FDX/HDX ability

3’b011 = Reserved

3’b100 = Manual selection of 100BASE-TX FDX

3’b101 = Manual selection of 100BASE-TX HDX

3’b110 = Manual selection of 10BASE-T FDX

3’b111 = Manual selection of 10BASE-T HDX

ASIX ELECTRONICS CORPORATION

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