307013-003 Datasheet, PDF (557/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

EHCI Controller Registers (D29:F7)
13.1.27 LEG_EXT_CS—USB EHCI Legacy Support Extended
Control / Status Register (USB EHCI—D29:F7)
Address Offset: 6C–6Fh
Attribute:
R/W, R/WC, RO
Default Value: 00000000h
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
SMI on BAR — R/WC. Software clears this bit by writing a 1 to it.
31 _{0 = Base Address Register (BAR) not written.}
1 = This bit is set to 1 when the Base Address Register (BAR) is written.
SMI on PCI Command — R/WC. Software clears this bit by writing a 1 to it.
30 _{0 = PCI Command (PCICMD) Register Not written.}
1 = This bit is set to 1 when the PCI Command (PCICMD) Register is written.
SMI on OS Ownership Change — R/WC. Software clears this bit by writing a 1 to it.
29 ^{0 = No HC OS Owned Semaphore bit change.}
1 = This bit is set to 1 when the HC OS Owned Semaphore bit in the LEG_EXT_CAP
register (D29:F7:68h, bit 24) transitions from 1 to 0 or 0 to 1.
28:22 Reserved — RO. Hardwired to 00h
SMI on Async Advance — RO. This bit is a shadow bit of the Interrupt on Async
Advance bit (D29:F7:CAPLENGTH + 24h, bit 5) in the USB2.0_STS register.
21
NOTE: To clear this bit system software must write a 1 to the Interrupt on Async
Advance bit in the USB2.0_STS register.
SMI on Host System Error — RO. This bit is a shadow bit of Host System Error bit in
the USB2.0_STS register (D29:F7:CAPLENGTH + 24h, bit 4).
20
NOTE: To clear this bit system software must write a 1 to the Host System Error bit in
the USB2.0_STS register.
SMI on Frame List Rollover — RO. This bit is a shadow bit of Frame List Rollover bit
(D29:F7:CAPLENGTH + 24h, bit 3) in the USB2.0_STS register.
19
NOTE: To clear this bit system software must write a 1 to the Frame List Rollover bit in
the USB2.0_STS register.
SMI on Port Change Detect — RO. This bit is a shadow bit of Port Change Detect bit
(D29:F7:CAPLENGTH + 24h, bit 2) in the USB2.0_STS register.
18
NOTE: To clear this bit system software must write a 1 to the Port Change Detect bit in
the USB2.0_STS register.
SMI on USB Error — RO. This bit is a shadow bit of USB Error Interrupt (USBERRINT)
bit (D29:F7:CAPLENGTH + 24h, bit 1) in the USB2.0_STS register.
17
NOTE: To clear this bit system software must write a 1 to the USB Error Interrupt bit in
the USB2.0_STS register.
SMI on USB Complete — RO. This bit is a shadow bit of USB Interrupt (USBINT) bit
(D29:F7:CAPLENGTH + 24h, bit 0) in the USB2.0_STS register.
16
NOTE: To clear this bit system software must write a 1 to the USB Interrupt bit in the
USB2.0_STS register.
Intel ^® ICH7 Family Datasheet
557