Specifications

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.