Datasheet
TUSB7320, TUSB7340
www.ti.com
SLLSE76E–MARCH 2011– REVISED JULY 2011
Table 6-55. xHCI Extended Capabilities Register (xHCI Extended Capabilities Base + 00h)
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
No.
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
State
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
No.
Reset
0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1
State
Table 6-56. USB Legacy Support Capability Register Description
Bit Field Name Access Description
31:25 RSVD r Reserved. Returns zeros when read.
24 HC_OS_SEMA rw HC OS Owned Semaphore.
23:17 RSVD r Reserved. Returns zeros when read.
16 HC_BIOS_SEMA rw HC BIOS Owned Semaphore.
Next Capability Pointer. This field is 04h, indicating that the xHCI
15:8 NEXT_CAP r Supported Protocol Capability for USB 2.0 starts at offset 10h from the
xHCI Extended Capabilities Base.
Capability ID. This field is 01h, identifying this capability as a USB
7:0 CAPABILITY_ID r
Legacy Support Capability.
6.6.2 USB Legacy Support Control/Status Register
This register is used by BIOS software to enable System Management Interrupts.
xHCI Extended Capabilities Base register offset:04h
Register type:Read-Only, Read/Clear
Default value: 0000 0000h
Table 6-57. xHCI Extended Capabilities Register (xHCI Extended Capabilities Base + 04h)
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
No.
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
State
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
No.
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
State
Table 6-58. USB Legacy Support Control/Status Register Description
Bit Field Name Access Description
31 SMI_BAR rc SMI on BAR.
30 SMI_PCI_COM rc SMI on PCI Command.
29 SMI_OS_CHANGE rc SMI on OS Ownership Change.
28:21 RSVD r Reserved. Returns zeros when read.
20 SMI_HOST_SYS_ERR r SMI on Host System Error.
19:17 RSVD r Reserved. Returns zeros when read.
16 SMI_EVENT_INT r SMI on Event Interrupt.
15 SMI_BAR_EN rw SMI on BAR Enable.
14 SMI_PCI_COM_EN rw SMI on PCI Command Enable.
Copyright © 2011, Texas Instruments Incorporated xHCI MEMORY MAPPED REGISTER SPACE 93
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Product Folder Link(s): TUSB7320 TUSB7340