TUSB7340 datasheet(90/117 Pages) TI1

90 / 117 page

TUSB7320, TUSB7340

SLLSE76M – MARCH 2011 – REVISED JULY 2015

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7.5.3.6.5

xHCI Supported Protocol Port Register (USB 2.0)

This register indicates how many USB 2.0 ports are supported and what their port numbers are.

xHCI Extended Capabilities Base register offset: 18h

Default value: 0001 0X01h

Table 192. xHCI Extended Capabilities Register (xHCI Extended Capabilities Base + 18h)

Bit

No.

Reset

State

Bit

No.

Reset

State

Table 193. xHCI Supported Protocol Capability Register (USB 2.0) Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

31:19

RSVD

Reserved. Returns zeros when read.

Integrated Hub Implemented. This field is 0 to indicate that the root hub

IHI

to external port mapping adheres to the default mapping in the xHCI

Specification.

High-speed Only. This field is 0 to indicate that the USB 2.0 ports are

HSO

Low-, Full-, and High-speed capable.

L1 Capability. This field is 1 to indicate that the TUSB73X0 supports the

L1C

USB 2.0 Link Power Management L1 state.

Compatible Port Count. For the TUSB7340 , this field is 04h to indicate

15:8

COMPATIBLE_PORT_CNT

that four USB 2.0 ports are supported. For the TUSB7320, this field is

02h to indicate that two USB 2.0 ports are supported.

Compatible Port Offset. This field is 01h to indicate that the first USB 2.0

7:0

COMPATIBLE_PORT_OFF

port is port 1.

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