Zynq UltraScale+ Devices Register Reference > Module Summary > USB3_XHCI Module > USBSTS (USB3_XHCI) Register

USBSTS (USB3_XHCI) Register

USBSTS (USB3_XHCI) Register Description

Register NameUSBSTS
Relative Address0x0000000024
Absolute Address 0x00FE200024 (USB3_0_XHCI)
0x00FE300024 (USB3_1_XHCI)
Width32
TypemixedMixed types. See bit-field details.
Reset Value0x00000000
DescriptionUSB Status Register Bit Definitions
For a description of this standard USB register field, see the eXtensible Host Controller Interface for Universal Serial Bus (USB) Specification 3.0.

USBSTS (USB3_XHCI) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
Reserved31:13roRead-only0x0Reserved
HCE12roRead-only0Host Controller Error (HCE) - RO
Default = 0.
0 = No internal xHC error conditions exist and 1 = Internal xHC error condition. This flag must be set to indicate that an internal error condition has been detected which requires software to reset and reinitialize the xHC.
CNR11roRead-only0Controller Not Ready (CNR) - RO
Default = 1.
0 = Ready and
1 = Not Ready.
Software must not write to thes Doorbell or Operational register of the xHC, other than the USBSTS register, until CNR = 0. This flag is set by the xHC after a Chip Hardware Reset and cleared when the xHC is ready to begin accepting register writes. This flag remains cleared (0) until the next Chip Hardware Reset.
SRE10wtcReadable, write a 1 to clear0Save/Restore Error
This bit is currently not supported.
RSS 9roRead-only0Restore State Status
This bit is similar to the USBSTS.RSS in host mode.
When the controller has finished the restore process, it completes the command by setting DSTS.RSS to 0.
SSS 8roRead-only0Save State Status
This bit is similar to the USBSTS.SSS in host mode.
When the controller has finished the save process, it completes the command by setting DSTS.SSS to 0.
Reserved 7:5roRead-only0x0Reserved
PCD 4wtcReadable, write a 1 to clear0Reset Value
EINT 3wtcReadable, write a 1 to clear0Reset Value
HSE 2wtcReadable, write a 1 to clear0HSE
For a description of this standard USB register field, see the eXtensible Host Controller Interface for Universal Serial Bus (USB) Specification 3.0.
Reserved 1roRead-only0x0Reserved
HCH 0roRead-only0HCH
For a description of this standard USB register field, see the eXtensible Host Controller Interface for Universal Serial Bus (USB) Specification 3.0.