AX88178
USB to 10/100/1000 Gigabit Ethernet/HomePNA Controller
6.2.1.22 GPIO Register (1Fh, write only)
Bit7
RSE
Bit6
Reserved
Bit5
GPO_2
Bit4
GPO2EN
Bit3
Bit2
Bit1
Bit0
GPO0EN
GPO_1 GPO1EN GPO_0
GPO0EN: Pin GPIO0 Output Enable.
1: Output is enabled (meaning GPIO0 is used as an output pin).
0: Output is tri-stated (meaning GPIO0 is used as an input pin) (default).
GPO_0: Pin GPIO0 Output Value.
GPO1EN: Pin GPIO1 Output Enable.
1: Output is enabled (meaning GPIO1 is used as an output pin).
0: Output is tri-stated (meaning GPIO1 is used as an input pin) (default).
GPO_1: Pin GPIO1 Output Value.
0: (default).
GPO2EN: Pin GPIO2 Output Enable.
1: Output is enabled (meaning GPIO2 is used as an output pin).
0: Output is tri-stated (meaning GPIO2 is used as an input pin) (default).
GPO_2: Pin GPIO2 Output Value.
0: (default).
RSE: Reload Serial EEPROM.
1: Enable.
0: Disabled (default)
6.2.1.23 Software Reset Register (20h, write only)
Bit7
0
Bit6
1
Bit5
0
Bit4
BZ
Bit3
PRL
Bit2
PRTE
Bit1
RT
Bit0
RR
RR: Clear frame length error for Bulk In.
1: set high to clear state.
0: set low to exit clear state (default).
RT: Clear frame length error for Bulk Out.
1: set high to enter clear state.
0: set low to exit clear state (default).
PRTE: External Phy Reset pin Tri-state Enable.
1: Enable, i.e., the external PHYRST_N pin is tri-stated (default). This allows the PHYRST_N pin’s active level to
be controlled by external pulled-up (active high during power-on) or pulled-down resistor (active low during
power-on).
0: Disabled, i.e., the external PHYRST_N pin’s level is driven by either PRL bit or internal “USB RESET” based on
the setting in SCPR bit in Flag byte of EEPROM.
PRL: External Phy Reset pin Level. When SCPR bit = 1 and PRTE = 0, this bit controls the output level of external
PHYRST_N pin.
1: Set to high (default).
0: Set to low.
BZ: Force Bulk In to return a Zero-length packet.
1: Software can force Bulk In to return a zero-length USB packet.
0: Normal operation mode (default).
Bit [7:5]: Please always write 010 to these bits.
24
ASIX ELECTRONICS CORPORATION
ASIX [ ASIX ELECTRONICS CORPORATION ]
