82801FB Datasheet, PDF (539/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

EHCI Controller Registers (D29:F7)
14.1.25
PWAKE_CAP—Port Wake Capability Register
(USB EHCI—D29:F7)
Address Offset: 62–63h
Default Value: 01FFh
Attribute: R/W
Size:
16 bits
This register is in the suspend power well. The intended use of this register is to establish a policy
about which ports are to be used for wake events. Bit positions 1–8 in the mask correspond to a
physical port implemented on the current EHCI controller. A 1 in a bit position indicates that a
device connected below the port can be enabled as a wake-up device and the port may be enabled
for disconnect/connect or overcurrent events as wake-up events. This is an information-only mask
register. The bits in this register do not affect the actual operation of the EHCI host controller. The
system-specific policy can be established by BIOS initializing this register to a system-specific
value. System software uses the information in this register when enabling devices and ports for
remote wake-up.
These bits are not reset by a D3-to-D0 warm rest or a core well reset.
Bit
Description
15:9 Reserved — RO.
Port Wake Up Capability Mask — R/W. Bit positions 1 through 8 correspond to a physical port
8:1 implemented on this host controller. For example, bit position 1 corresponds to port 1, bit position 2
corresponds to port 2, etc.
0
Port Wake Implemented — R/W. A 1 in this bit indicates that this register is implemented to
software.
14.1.26
LEG_EXT_CAP—USB EHCI Legacy Support Extended
Capability Register (USB EHCI—D29:F7)
Address Offset: 68–6Bh
Attribute: R/W, RO
Default Value:
00000001h
Size:
32 bits
Power Well:
Suspend
NOTE: These bits are not reset by a D3-to-D0 warm rest or a core well reset.
Bit
Description
31:25 Reserved — RO. Hardwired to 00h
24
23:17
16
HC OS Owned Semaphore — R/W. System software sets this bit to request ownership of the EHCI
controller. Ownership is obtained when this bit reads as 1 and the HC BIOS Owned Semaphore bit
reads as clear.
Reserved — RO. Hardwired to 00h
HC BIOS Owned Semaphore — R/W. The BIOS sets this bit to establish ownership of the EHCI
controller. System BIOS will clear this bit in response to a request for ownership of the EHCI
controller by system software.
15:8
Next EHCI Capability Pointer — RO. Hardwired to 00h to indicate that there are no EHCI Extended
Capability structures in this device.
7:0
Capability ID — RO. Hardwired to 01h to indicate that this EHCI Extended Capability is the Legacy
Support Capability.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
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