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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 66
HcRhPortStatus - 32 bits - [MEM_Reg : 50h+4*(1:NDP)]
Field Name Bits Default HCD HC Description
CSC 16 0b RW RW
ConnectStatusChange
This bit is set whenever a connect or disconnect
event occurs. The HCD writes a ‘1’ to clear this bit.
Writing a ‘0’ has no effect. If CurrentConnectStatus
is cleared when a SetPortReset, SetPortEnable, or
SetPortSuspend write occurs, this bit is set to force
the driver to re-evaluate the connection status since
these writes should not occur if the port is
disconnected.
0 = No change in CurrentConnectStatus
1 = Change in CurrentConnectStatus
Note: If the DeviceRemovable[NDP] bit is set, this
bit is set only after a Root Hub reset to inform the
system that the device is attached.
PESC 17 0b RW RW
PortEnableStatusChange
This bit is set when hardware events cause the
PortEnableStatus bit to be cleared. Changes from
HCD writes do not set this bit. The HCD writes a ‘1’ to
clear this bit. Writing a ‘0’ has no effect.
0 = No change in PortEnableStatus
1 = Change in PortEnableStatus
PSSC 18 0b RW RW
PortSuspendStatusChange
This bit is set when the full resume sequence has
been completed. This sequence includes the 20-s
resume pulse, LS EOP, and 3-ms resychronization
delay. The HCD writes a ‘1’ to clear this bit. Writing a
‘0’ has no effect. This bit is also cleared when
ResetStatusChange is set.
0 = Resume is not completed
1 = Resume completed
OCIC 19 0b RW RW
PortOverCurrentIndicatorChange
This bit is valid only if overcurrent conditions are
reported on a per-port basis. This bit is set when Root
Hub changes the PortOverCurrentIndicator bit. The
HCD writes a ‘1’ to clear this bit. Writing a ‘0’ has no
effect.
0 = No change in PortOverCurrentIndicator
1 = PortOverCurrentIndicator has changed
PRSC 20 0b RW RW
PortResetStatusChange
This bit is set at the end of the 10-ms port reset
signal.
The HCD writes a ‘1’ to clear this bit. Writing a ‘0’ has
no effect.
0 = Port reset is not complete
1 = Port reset is complete
Reserved 31:21 Reserved
2.2.2 USB Legacy Keyboard Operation
2.2.2.1 Overview
To support applications and drivers in non-USB-aware environments (e.g., DOS), the Host Controller needs
to provide some amount of hardware support for the emulation of a PS/2 keyboard and/or mouse by their
USB equivalents. For Open HCI, this emulation support is provided by a set of registers that are controlled
by code running in SMM. Working in conjunction, this hardware and software produces approximately the
same behavior-to-application code as would be produced by a PS/2-compatible keyboard and/or mouse
interface.
To minimize hardware impact, the Host Controller accesses a USB keyboard and/or mouse using the