Datasheet

TUSB7320, TUSB7340

SLLSE76E–MARCH 2011– REVISED JULY 2011

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6.5 Host Controller Doorbell Registers

The TUSB73X0 supports an array of 65 Doorbell Registers, one for the host controller plus one for each

Device Slot supported. The address of the first Doorbell Register is the address programmed into the

Base Address Register 0 plus the value programmed into the Doorbell Offset (see Section 6.2.7).

Doorbell Base register offset:00h + (04h*Device Slot), where Device Slot = 0 through 64

Default value: 0000 0000h

Table 6-52. HC Doorbell Register (Doorbell Base + (04h*Device Slot)), where Device Slot = 0 through 64

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 6-53. Interrupter Management Register Description

Bit Field Name Access Description

31:16 DB_STREAM_ID rw Doorbell Stream ID. This field returns zeros when read.

15:8 RSVD r Reserved. Returns zeros when read.

7:0 DB_TARGET rw Doorbell Target. This field returns zeros when read.

6.6 xHCI Extended Capabilities Registers

These registers are used for the xHCI Extended Capabilities in the TUSB73X0. The offset in Table 6-54 is

from the xHCI Extended Capabilities Base, which is the address programmed into the Base Address

Controller Capability Parameters (see Section 6.2.6).

Table 6-54. xHCI Extended Capabilities Register Map

Legacy Support Capability 00h-07h

Reserved 08h-0Fh

xHCI Supported Protocol Capability (USB 2.0) 10h-1Bh

Reserved 1Ch-1Fh

xHCI Supported Protocol Capability (USB 3.0) 20h-2Bh

6.6.1 USB Legacy Support Capability Register

This register is used to coordinate the ownership of the host controller between BIOS and the operating

system.

xHCI Extended Capabilities Base register offset:00h

Default value: 0000 0201h

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Product Folder Link(s): TUSB7320 TUSB7340