USB3503 datasheet(54/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

7.3.3

Interface Descriptor (Single-TT)

The following table provides interface descriptor values for High-Speed Single-TT operation.

Attributes

user/

signal

Configuration characteristics: Communicates the

capabilities of the hub regarding Remote Wake-up

capability, and also reports the self-power status. In all

cases, the value reported to the host always indicates

that the hub supports Remote Wakeup.

The value reported to the host is dependant upon the

SELF_BUS_PWR bit (CONFIG_BYTE_1)

= A0h for Bus-Powered (SELF_BUS_PWR = 0).

= E0h for Self-Powered (SELF_BUS_PWR = 1).

All other values are reserved.

MaxPower

user

Maximum Power Consumption of the Hub from VBUS

when fully operational. This value includes all support

circuitry associated with the hub (including an attached

“embedded” peripheral if hub is part of a compound

device), and is in 2mA increments. The Hub supports

Self-Powered and Bus-Powered operation. The

SELF_BUS_PWR bit (CONFIG_BYTE_1) is used to

determine which of the values below are reported. The

value reported to the host must coincide with the

current operating mode, and will be determined by the

following rules.

The value that is reported to the host will be:

‘MAX_PWR_BP’ if SELF_BUS_PWR = ‘0’

‘MAX_PWR_SP’ if SELF_BUS_PWR = ‘1’

In all cases the reported value is sourced from the MAX

POWER data field (for Self or Bus power) that was

loaded by Internal Default, or serial port configuration.

Table 7.7 Interface Descriptor (High-Speed, Single-TT)

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

Length

09h

Size of this Descriptor.

DescriptorType

04h

Interface Descriptor Type.

InterfaceNumber

00h

Number of this interface.

AlternateSetting

00h

Value used to select this alternate setting for the

interface.

NumEndpoints

01h

Number of endpoints used by this interface (not

including endpoint 0).

InterfaceClass

09h

Hub class code.

InterfaceSubclass

00h

Subclass code

Table 7.6 Configuration Descriptor (High-Speed) (continued)

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

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