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2.2
OCHI USB 1.1 and EHCI USB 2.0 Controllers
Note: Some USB functions are controlled by, and associated with, certain PCI configuration registers in the
SMBus/ACPI device. For more information refer to
0). The diagram below lists these USB functions and the associated registers.
Function
2.2.1
OHCI Registers (Device 19, Function 0, 1, 2, 3, 4)
2.2.1.1
PCI Configuration Registers (PCI_Reg)
There are 5 Open-HCI compatible USB host controllers present (functions 0, 1, 2, 3, and 4), and each has
their own set of registers. This section describes the configuration registers necessary for the OpenHCI-
compliant USB Host Controllers to interface with other system components in a PCI-based PC host. These
registers are accessed for set-up during PCI initialization or through special cycles during normal system
runtime. Below is summary of the registers that are necessary for the OpenHCI-compliant USB Host
Controller to be successfully configured in a PCI-based PC host.
OHCI0 – PCI config
Revision ID / Class Code
Subsystem Vendor ID / Subsystem ID
Config Timers / MSI Disable
Over Current Control 1
Over Current Control 2
OHCI OverCurrent Enable
Target Timeout Control
OHCI1/2/3/4 – PCI config
©2008 Advanced Micro Devices, Inc.
AMD SB600 Register Reference Manual
USB
OHCI / EHCI Controller Enables
USB Reset / PowerDown
USB Legacy control
USB Smart Power Control
USB PM & SMI Control
ACh
0Fh
Register Name
Device / Vendor ID
Command
Status
Miscellaneous
BAR_OHCI
Capability Pointer
Interrupt Line
Port Disable Control
OHCI Misc Control
MSI Control
MSI Address
MSI Data
HT MSI Support
section 2.3: SMBus Module and ACPI Block (Device 20,
PCI_Reg:
61/64/65/68/6Bh
AD:AC
AD:AC
3Ch
5B/5Ch
78h
BEh
OCHI USB 1.1 and EHCI USB 2.0 Controllers
Proprietary
Offset Address
00h
04h
06h
08h
0Ch
10h
2Ch
34h
3Ch
40h – 41h
42h – 43h
50h
58h
5Ch
68h – 69h
74h
D0h
D4h
D8h
E4h
Page 44
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