Host Capabilities, Offset, and Operations Registers

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

The USB host capabilities, offset, and operations registers are located in the USB_2_XHCI register set at base address 0xFE20_0000. They are summarized in the following table.

  • CONFIG register

    This register is in the AUX power well. It is only reset by the platform during a cold reset or in response to a host controller reset (HCRST).

Table 1. USB Host Capabilities, Offsets, and Operations Registers
Register Name Offset Address Access Type Description
CAPLENGTH 0x0000 R Length capability


            HCSPARAMS1
        


            HCSPARAMS2
        


            HCSPARAMS3
        

0x0004
0x0008
0x000C

R Host controller structural parameters


            HCCPARAMS1
        


            HCCPARAMS2
        

0x0010
0x001C

R Host controller capability parameters
DBOFF 0x0014 R Doorbell offset
RTSOFF 0x0018 R Run time offset
USBCMD 0x0020 RW USB command
USBSTS 0x0024 R, W1C USB status
PAGESIZE 0x0028 R Page size
DNCTRL 0x0034 RW Device notification


            CRCR_LO
        


            CRCR_HI
        

0x0038
0x003C

RW, R  


            DCBAAP_LO
        


            DCBAAP_HI
        

0x0050
0x0054

RW Device context BAAP
CONFIG 0x0058 RW Configure