Zynq UltraScale+ Devices Register Reference > Module Summary > USB3_XHCI Module > HCSPARAMS2 (USB3_XHCI) Register

HCSPARAMS2 (USB3_XHCI) Register

HCSPARAMS2 (USB3_XHCI) Register Description

Register NameHCSPARAMS2
Relative Address0x0000000008
Absolute Address 0x00FE200008 (USB3_0_XHCI)
0x00FE300008 (USB3_1_XHCI)
Width32
TyperoRead-only
Reset Value0x00000000
DescriptionStructural Parameters 2 Register
For register definitions, refer to the xHCI specification.

HCSPARAMS2 (USB3_XHCI) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
MAXSCRATCHPADBUFS31:27roRead-only0Max Scratchpad Bufs Lo
The value is calculated based on chosen configuration parameter values. Possible values are 1-4.
SPR26roRead-only0Scratchpad Restore (SPR)
MAXSCRATCHPADBUFS_HI25:21roRead-only0Max Scratchpad Bufs HI
The core automatically updates this field.
Reserved20:8roRead-only0x0Reserved
ERSTMAX 7:4roRead-only0Event Ring Segment Table Max (ERST Max)
IST 3:0roRead-only0Isochronous Scheduling Threshold (IST)