Visible to Intel only — GUID: fkw1679333616446
Ixiasoft
Visible to Intel only — GUID: fkw1679333616446
Ixiasoft
5.6.5.10.3. USB 3.1 Mode-switch Controller
The USB mode switch controller represents the current mode of the HPS USB 3.1 controller. At reset state, the USB 3.1 controller is configured as host during HPS boot phase. The combination of vbus_det and usb31_id signals decide whether the USB 3.1 controller needs to switch state or not. The figure shows how the controller state changes based on these two signals:
Host Mode
- At reset, FSM state is at host mode: “vbus_det” == 1’b1 and “usb31_id” == 1’b0
- USB31 Controller remains in host mode: “vbus_det” == 1’b1 and “usb31_id” == 1’b0
- USB31 Controller remains in Host mode: “vbus_det” == 1’b0 and “usb31_id” == 1’b0
- USB31 Controller switch to device mode: “vbus_det” == 1’b1 and “usb31_id” == 1’b1
Device Mode
- USB31 Controller remains in Device mode: “vbus_det” == 1’b0 and “usb31_id” == 1’b0
- • USB31 Controller remains in Device mode: “vbus_det” == 1’b0 and “usb31_id” == 1’b1
- USB31 Controller switch to Host mode: “vbus_det” == 1’b1 and “usb31_id” == 1’b0
Driving “PowerPreset”
- When HPS USB31 Controller is configured as Host, “PowerPresent” is tied to 1’b1
- • When HPS USB31 Controller is configured as Device, “PowerPresent” is tied to “vbus_det”
The following table shows the detailed information for the USB 3.1 mode-switch controller signals.
Signal Name | Width | Input/Output | Comments |
---|---|---|---|
CTRL_RST_MODE | 2 | Parameter | Controller reset mode parameter can be configured during instantiation to specify the controller state; 2’b01: Host 2’b10: Device 2’b00, 2’b11: Reserved |
clk | 1 | Input | Clock |
rst_b | 1 | Input | Reset |
usb31_id | 1 | Input | USB31 ID value from fabric. 1’b0: UFP (Device) is connected to Type-C Connector 1’b1: DFP (Host) is connected to Type-C Connector |
vbus_det | 1 | Input | VBUS detect 1’b0: No device is attached to Type-C connector 1’b1: Device is attached to Type-C Connector |
PowerPresent | 1 | Output | Power present 1’b0: No device is attached to Type-C connector when Controller is in Device 1’b1: Device is attached to Type-C Connector or Controller is in Host mode |