Datasheet
EHCI Controller Registers (D29:F0)
Intel® Xeon® Processor D-1500 Product Family 399
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
10.1.21 DEBUG_CAPID—Debug Port Capability ID Register
(USB EHCI—D29:F0)
Address Offset: 58h Attribute: RO
Default Value: 0Ah Size: 8 bits
10.1.22 NXT_PTR2—Next Item Pointer #2 Register (USB EHCI—
D29:F0)
Address Offset: 59h Attribute: RO
Default Value: 98h Size: 8 bits
Function Level Reset: No
10.1.23 DEBUG_BASE—Debug Port Base Offset Register
(USB EHCI—D29:F0)
Address Offset: 5Ah–5Bh Attribute: RO
Default Value: 20A0h Size: 16 bits
10.1.24 USB_RELNUM—USB Release Number Register (USB EHCI—
D29:F0)
Address Offset: 60h Attribute: RO
Default Value: 20h Size: 8 bits
10.1.25 FL_ADJ—Frame Length Adjustment Register (USB EHCI—
D29:F0)
Address Offset: 61h Attribute: R/W
Default Value: 20h Size: 8 bits
Function Level Reset: No Power Well: Suspend
This feature is used to adjust any offset from the clock source that generates the clock
that drives the SOF counter. When a new value is written into these six bits, the length
of the frame is adjusted. Its initial programmed value is system dependent based on
the accuracy of hardware USB clock and is initialized by system BIOS. This register
should only be modified when the HChalted bit (D29:F0:CAPLENGTH + 24h, bit 12) in
the USB2.0_STS register is a 1. Changing value of this register while the host controller
Bit Description
7:0 Debug Port Capability ID — RO. Hardwired to 0Ah indicating that this is the start of a Debug Port
Capability structure.
Bit Description
7:0 Next Item Pointer 2 Capability — RO. This register points to the next capability in the Function
Level Reset capability structure.
Bit Description
15:13 BAR Number — RO. Hardwired to 001b to indicate the memory BAR begins at offset 10h in the
EHCI configuration space.
12:0 Debug Port Offset — RO. Hardwired to 0A0h to indicate that the Debug Port registers begin at
offset A0h in the EHCI memory range.
Bit Description
7:0 USB Release Number — RO. A value of 20h indicates that this controller follows Universal Serial
Bus (USB) Specification, Revision 2.0.