SLLSE76Q March 2011 – March 2024 TUSB7320 , TUSB7340
PRODUCTION DATA
This register indicates how many USB 2.0 ports are supported and what their port numbers are.
xHCI Extended Capabilities Base register offset: 18h
Register type: Read-Only
Default value: 0001 0X01h
Bit No. | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
Reset State | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
Bit No. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reset State | 0 | 0 | 0 | 0 | 0 | x | x | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
BIT | FIELD NAME | ACCESS | DESCRIPTION |
---|---|---|---|
31:19 | RSVD | r | Reserved. Returns zeros when read. |
18 | IHI | r | Integrated Hub Implemented. This field is 0 to indicate that the root hub to external port mapping adheres to the default mapping in the xHCI Specification. |
17 | HSO | r | High-speed Only. This field is 0 to indicate that the USB 2.0 ports are Low-, Full-, and High-speed capable. |
16 | L1C | r | L1 Capability. This field is 1 to indicate that the TUSB73X0 supports the USB 2.0 Link Power Management L1 state. |
15:8 | COMPATIBLE_PORT_CNT | r | Compatible Port Count. For the TUSB7340, this field is 04h to indicate 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. |
7:0 | COMPATIBLE_PORT_OFF | r | Compatible Port Offset. This field is 01h to indicate that the first USB 2.0 port is port 1. |