82801DB Datasheet, PDF (426/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

EHCI Controller Registers (D29:F7)
12.1.21
NXT_PTR2—Next Item Pointer #2 Register
(USB EHCI—D29:F7)
Address Offset: 59h
Default Value: 00h
Attribute: RO
Size:
8 bits
Bit
Description
7:0
Next Item Pointer 2 Capability — RO. Hardwired to 00h: indicates that there are no more capability
structures in this function.
12.1.22
DEBUG_BASE—Debug Port Base Offset Register
(USB EHCI—D29:F7)
Address Offset: 5Ah–5Bh
Default Value: 2080h
Attribute: RO
Size:
16 bits
Bit
Description
15:13
12:0
BAR Number — RO. Hardwired to 001b: indicates the memory BAR begins at offset 10h in the
EHCI configuration space.
Debug Port Offset — RO. Hardwired to 080h; indicates that the Debug Port registers begin at offset
80h in the EHCI memory range.
12.1.23
USB_RELNUM—USB Release Number Register
(USB EHCI—D29:F7)
Address Offset: 60h
Default Value: 20h
Attribute: RO
Size:
8 bits
Bit
Description
7:0
USB Release Number — RO. A value of 20h indicates that this controller follows the Universal
Serial Bus (USB) Specification, Revision 2.0 .
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Intel^® 82801DB ICH4 Datasheet