Specifications

 2012 Advanced Micro Devices, Inc.
USB – OHCI & EHCI controllers (bus-0, dev-18/19, fun-00 ~02/
bus-0, dev-20, fun-05)
AMD SP5100 Register Programming Requirements
Page 44
6.2 USB Device Support to Wake Up System from S3/S4 State
ASIC Rev Register Settings Function/Comment
All Revs SP5100 PM_IO 0x61 [6] = 1
PM_IO 0x65 [2] = 1 (default)
Enables the USB PME event.
Enables USB resume support.
PM_IO 0x65 [6] = 1 Enable PME generation for USB Wake event from connect
and disconnect of USB devices.
Note: BIOS workaround A2 described in Appendix A must be
implemented for this feature to work reliably. Without the
workaround PME Wake for Connect/Disconnect of USB 1.1
devices will not be supported.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
RTC
ACPI
PM REG
A-LINK
I/O REG
XIOAPIC
X
6.3 USB S4/S5 Wakeup or PHY Power Down Support
ASIC Rev Register Settings Function/Comment
All Revs SP5100 PM_IO 0x65 [0] = 0 (default) This bit = 0 (default) supports USB device wakeup from the
S4/S5 state.
Set the bit to 1 to disable the USB S4/S5 wakeup function.
The analog power supply to USB PHY on the motherboard
can be OFF in this case to save S4/S5 power.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
RTC
ACPI
PM REG
A-LINK
I/O REG
XIOAPIC
X
6.4 USB PHY Auto Calibration Setting
ASIC Rev Register Settings Function/Comment
All Revs SP5100 EHCI_BAR 0xC0 = 0x00020F00 Enables the USB PHY auto calibration resistor to match
45ohm resistance.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
X
RTC
ACPI
PM REG
A-LINK
I/O REG
XIOAPIC