Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
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5.6.8.1. USB 3.1 Gen1 Controller Wakeup and Power Control
To reduce power, the USB 3.1 controller supports a power-down mode. In power-down mode, the controller and the PHY can shut down their clocks. The controller supports wakeup on the detection of the following events:
- Resume
- Remote wakeup
- Session request protocol
- New session start
The USB specification has different power states:
- For SuperSpeed, there are four power states: U0, U1, U2, and U3
- USB 2.0 has three power states: L0, L1, and Suspend (L2)
Hibernation is not supported. No suspend mode supported. Driver should not put controller into U3 state.