Datasheet
xHCI Controller Registers (D20:F0)
442 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
11.3.1.7 dBOFF—Doorbell Offset Register
Offset: MEM_BASE + 14h–17h Attribute: RO
Default Value: 0000C000h Size: 32 bits
11.3.1.8 RTSOFF—Runtime Register Space Offset Register
Offset: MEM_BASE + 18h–1Bh Attribute: RO
Default Value: 00001000h Size: 32 bits
11.3.2 Host Controller Operational Registers
This section defines the xHC operational registers. These registers are located after the
capabilities registers. The operational register base must be DWord-aligned and is
calculated by adding the value in the first capabilities register (CAPLENGTH) to the base
address of the xHC register address space (MEM_BASE). Since CAPLENGTH is always
80h, Table 11-3 already accounts for this offset. All registers are 32 bits in length.
Bit Description
31:2 Doorbell Array Offset — RO. This field defines the DWord offset of the Doorbell Array base address
from the Base (that is, the base address of the xHCI Capability register address space).
1:0 Reserved.
Bit Description
31:2 Runtime Register Space Offset— RO. This field defines the 32-byte offset of the xHCI Runtime
Registers from the Base. That is, Runtime Register Base Address = Base + Runtime Register Set
Offset.
1:0 Reserved.
Table 11-3. Enhanced Host Controller Operational Register Address Map (Sheet 1 of 2)
MEM_BASE +
Offset
Power Well Mnemonic Register Name Default Type
80h–83h Core USB_CMD USB Command 00000000h R/W, RO
84h–87h Core USB_STS USB Status 00000001h R/WC, RO
88h–8Bh Core PAGESIZE Page Size 00000001h RO
94h–97h Core DNCTRL Device Notification Control 00000000h R/W, RO
98h–9Bh Core CRCRL Command Ring Control Low 00000000h R/W, RO
9Ch–9Fh Core CRCRH Command Ring Control High 00000000h R/W, RO
B0h–B3h Core DCBAAPL Device Context Base Address
Array Pointer Low
00000000h R/W, RO
B4h–B7h Core DCBAAPH Device Context Base Address
Array Pointer High
00000000h R/W, RO
B8h–BBh Core CONFIG Configure 00000000h R/W, RO
480h, 490h,
4A0h, 4B0h,
4C0h, 4D0h,
4E0h, 4F0h,
500h, 510h,
520h, 530h,
540h, 550h,
560h
Multiple PORTSCNUSB2 Port N Status and Control
USB2
000002A0h R/W, R/WC,
RO, R/WO, R/
WOC