AX88179
USB 3.0 to 10/100/1000M Gigabit Ethernet Controller
APPENDIX A. Default Wake-On-LAN (DWOL) Ready Mode
This Default WOL Ready Mode application is different from normal operation where AX88179 Suspend/Resume
state usually has to be configured by software driver during normal system operation. This application applies to a system
that needs to use a predefined remote wakeup event to turn on the power supply of the system processor and its peripheral
circuits without having any system software running in the beginning. This is quite useful when a system has been powered
down already and a user needs to power on the system from a remote location.
The AX88179 can be configured to support Default WOL Ready Mode, where no system driver is required to
configure its WOL related settings after power on reset. A system design usually partitions its power supply into two or
more groups and the AX88179 is supplied with an independent power separated from the system processor. The power
supply of AX88179 is usually available as soon as power plug is connected. The power supply of system processor remains
off initially when power plug is connected and is controlled by AX88179’s PME pin, which can be activated whenever
AX88179 detects a predefined wakeup event such as valid Magic Packet reception or the EXTWAKE_N pin trigger. To
conserve power consumption, initially the USB host controller communicating with AX88179 can also be unpowered as the
system processor.
The PME pin of AX88179 can control the power management IC to power up the system processor along with the
USB host controller, which will perform USB transactions with AX88179 after both have been initialized. The pin polarity
of PME is configured as high active when enabling Default WOL Ready Mode (see following A.1 Note 2). Note that the
AX88179 must be in self-power (via setting EEPROM Flag [0]) mode for this function.
A.1 Procedure to Enable Default WOL Ready Mode
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