USB3803 datasheet(57/99 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001691B-page 57

USB3803

7.4.4

INTERFACE DESCRIPTOR (SINGLE-TT)

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

TotalLength

yyyyh

Total combined length of all descriptors for this configu-

ration (configuration, interface, endpoint, and class- or

vendor-specific).

yyyyh = 0019h

NumInterfaces

01h

Number of interfaces supported by this configuration.

ConfigurationValue

01H

Value to use as an argument to the SetConfiguration()

request to select this configuration.

Configuration

00h

Index of string descriptor describing this configuration

(string not supported).

Attributes

user/

signal

Configuration characteristics: Communicates the capa-

bilities 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 deter-

mine which of the values below are reported. The value

reported to the host must coincide with the current oper-

ating 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 7-18:

INTERFACE DESCRIPTOR (HIGH-SPEED, SINGLE-TT)

Offset

Field

Size

Value

Description

Length

09h

Size of this Descriptor.

DescriptorType

04h

Interface Descriptor Type.

TABLE 7-17:

CONFIGURATION DESCRIPTOR (HIGH-SPEED, SINGLE-TT ONLY) (CONTINUED)

Offset

Field

Size

Value

Description

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