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©2008 Advanced Micro Devices, Inc.
OCHI USB 1.1 and EHCI USB 2.0 Controllers
AMD SB600 Register Reference Manual Proprietary Page 81
HCSPARAMS – R - 32 bits - [MEM_Reg : 04h]
Field Name Bits Default Description
Reserved 19:17 These bits are reserved and should be set to zero.
Debug Port Number 23:20 1h
Optional. This register identifies which of the host controller
ports is the debug port. The value is the port number (one-
based) of the debug port. A non-zero value in this field
indicates the presence of a debug port. The value in this
register must not be greater than N_PORTS.
Reserved 31:24 These bits are reserved and should be set to zero.
HCCPARAMS – R - 32 bits - [MEM_Reg : 08h]
Field Name Bits Default Description
64-bit Addressing
Capability
0 0b This field documents the addressing range capability of this
implementation.
0 = Data structures using 32-bit address memory pointers
1 = Data structures using 64-bit address memory pointers
Programmable Frame List
Flag
1 1b If this bit is set to a zero, then system software must use a
frame list length of 1024 elements with this host controller.
The USBCMD register Frame List Size field is a read-only
register and should be set to zero. If set to a one, then
system software can specify and use a smaller frame list
and configure the host controller via the USBCMD register
Frame List Size field. The frame list must always be aligned
on a 4K page boundary. This requirement ensures that the
frame list is always physically contiguous.
Asynchronous Schedule
Park Capability
2 0b If this bit is set to a one, then the host controller supports the
park feature for high-speed queue heads in the
Asynchronous Schedule. The feature can be disabled or
enabled and set to a specific level by using the
Asynchronous Schedule Park Mode Enable and
Asynchronous Schedule Park Mode Count fields in the
USBCMD register.
Reserved 3 These bits are reserved and should be set to zero.
Isochronous Scheduling
Threshold
7:4 1h This field indicates, relative to the current position of the
executing host controller, where software can reliably
update the isochronous schedule. When bit [7] is zero, the
value of the least significant 3 bits indicates the number of
micro-frames a host controller can hold a set of isochronous
data structures (one or more) before flushing the state.
When bit [7] is a one, then host software assumes the host
controller may cache an isochronous data structure for an
entire frame.
EHCI Extended
Capabilities Pointer (EECP)
15:8 A0h This optional field indicates the existence of a capabilities
list. A value of 00h indicates no extended capabilities are
implemented. A non-zero value in this register indicates the
offset in PCI configuration space of the first EHCI extended
capability. The pointer value must be 40h or greater if
implemented to maintain the consistency of the PCI header
defined for this class of device.
Reserved 31:16 These bits are reserved and should be set to zero.