USB3503 datasheet(40/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 40

 2011-2015 Microchip Technology Inc.

7.2.2

CONFIGURATION DESCRIPTOR

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

SerialNumber

zzh

If STRING_EN =0 Optional string is not supported, and

zz = 00.

If STRING_EN = 1, String support is enabled, and

zz = 03

NumConfigurations

01h

Supports 1 configuration.

TABLE 7-2:

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

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

Length

09h

Size of this Descriptor.

DescriptorType

02h

Configuration Descriptor Type.

TotalLength

yyyyh

Total combined length of all descriptors for this

configuration (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

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 7-1:

DEVICE DESCRIPTOR (CONTINUED)

Offset

Field

Size

Value

Description

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