ASIX ELECTRONICS CORPORATION

21

AX88772

USB to 10/100 Fast Ethernet/HomePNA Controller

6.2.1.4 PHY Read Register (07h, read only)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

AA [7:0]

00h

CC [7:0]

AA [4:0]: The PHY ID value.

CC [4:0]: The register address of Ethernet PHY’s internal register.

AA [7:5]: Reserved

CC [7:5]: Reserved

6.2.1.5 PHY Write Register (08h, write only)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

AA [7:0]

00h

CC [7:0]

AA [4:0]: The PHY ID value.

CC [4:0]: The register address of Ethernet PHY’s internal register.

AA [7:5]: Reserved

CC [7:5]: Reserved

6.2.1.6 Serial Management Status Register (09h, read only)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Reserved

Host_EN

Host_EN: Host access Enable. Software can read this register to determine the current ownership of Serial

Management Interface.

1: Software is allowed to access Ethernet PHY’s internal registers via PHY Read Register or PHY Write Registers.

0: ASIC’s hardware owns the Serial Management Interface and software’s access is ignored.

6.2.1.7 Hardware Serial Management Control Register (0Ah, write only)

When software is done accessing Serial Management Interface, one needs to issue this command to release the

ownership of the Interface back to ASIC’s hardware. After issuing this command, following PHY Read Register or

PHY Write Register from software will be ignored. NOTE: Software should issue this command every time after

finished accessing Serial Management Interface to release the ownership back to hardware to allow periodic Interrupt

Endpoint to be able to access the Ethernet PHY’s registers via the Serial Management Interface.

6.2.1.8 SROM Read Register (0Bh, read only)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

AA [7:0]

AA [7:0]: The read address of Serial EEROM.