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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 50
Over Current Control 1 (OHCI0 only) – R - 32 bits - [PCI_Reg : 58h]
Field Name Bits Default Description
Port5 OverCurrent Control 23:20 Fh The register is to control the OverCurrent pin mapping for
Port-5. There are 10 OverCurrent pins (USB_OC0 ~
USB_OC9), any value greater than 0x9h will disable the
OverCurrent function for port-5.
Port6 OverCurrent Control 27:24 Fh The register is to control the OverCurrent pin mapping for
Port-6. There are 10 OverCurrent pins (USB_OC0 ~
USB_OC9), any value greater than 0x9h will disable the
OverCurrent function for port-6.
Port7 OverCurrent Control 31:28 Fh The register is to control the OverCurrent pin mapping for
Port-7. There are 10 OverCurrent pins (USB_OC0 ~
USB_OC9), any value greater than 0x9h will disable the
OverCurrent function for port-7.
There are 10 pins can be used as USB OverCurrent function –
USB_OC0#/GPM0# USB_OC1#/GPM1# USB_OC2#/GPM2# USB_OC3#/GPM3#
USB_OC4#/GPM4# USB_OC5#/GPM5# USB_OC6#/GEVENT6# USB_OC7#/GEVENT7#
USB_OC8#/GPM8# USB_OC9#/SLP_S2/GPM9#
Register value-to-OverCurrent Pin mapping:
USB_OC0# = 0000, USB_OC1# = 0001, USB_OC2# = 0010, USB_OC3# = 0011,
USB_OC4# = 0100, USB_OC5# = 0101, USB_OC6# = 0110, USB_OC7# = 0111,
USB_OC8# = 1000, USB_OC9# = 1001
* Note: Since OverCurrent pins can be used as GPM# as well, the corresponding register bits to set the pin as
OverCurrent have to be set in Smbus Controller.
Over Current Control 2 (OHCI0 only) – R - 32 bits - [PCI_Reg : 5Ch]
Field Name Bits Default Description
Port8 OverCurrent Control 3:0 Fh The register is to control the OverCurrent pin mapping for
Port-8. There are 10 OverCurrent pins (USB_OC0 ~
USB_OC9), any value greater than 0x9h will disable the
OverCurrent function for port-8.
Port9 OverCurrent Control 7:4 Fh The register is to control the OverCurrent pin mapping for
Port-9. There are 10 OverCurrent pins (USB_OC0 ~
USB_OC9), any value greater than 0x9h will disable the
OverCurrent function for port-9.
Reserved 31:8 Reserved
There are 10 pins can be used as USB OverCurrent function –
USB_OC0#/GPM0# USB_OC1#/GPM1# USB_OC2#/GPM2# USB_OC3#/GPM3#
USB_OC4#/GPM4# USB_OC5#/GPM5# USB_OC6#/GEVENT6# USB_OC7#/GEVENT7#
USB_OC8#/GPM8# USB_OC9#/SLP_S2/GPM9#
Register value-to-OverCurrent Pin mapping:
USB_OC0# = 0000, USB_OC1# = 0001, USB_OC2# = 0010, USB_OC3# = 0011,
USB_OC4# = 0100, USB_OC5# = 0101, USB_OC6# = 0110, USB_OC7# = 0111,
USB_OC8# = 1000, USB_OC9# = 1001
*Note: Since OverCurrent pins can be used as GPM# as well, the corresponding register bits to set the pin as
OverCurrent have to be set in Smbus Controller.
OHCI OverCurrent Enable (OHCI0 only) – RW - 16 bits - [PCI_Reg : 68h]
Field Name Bits Default Description
OHCI OverCurrent Enable 9:0 00h Writing this bit to a one enables the respective port to be
sensitive to over-current conditions as wake-up events when
it is owned by OHCI.
Reserved 15:10 00h Reserved