USB3803 datasheet(68/99 Pages) MICROCHIP

68 / 99 page

USB3803

DS00001691B-page 68

 2014-2015 Microchip Technology Inc.

7.7

String Descriptors

The USB3803 supports a 30 Character Manufacturer String Descriptor, a 30 Character Product String and a 30 charac-

ter Serial String.

HubContrCurrent

user

Maximum current requirements of the Hub Controller

electronics in 1 mA increments. See Section 11.23.2.1 in

the USB Specification for additional details on the use of

this field.

This field reports the maximum current that only the hub

consumes from upstream VBUS when fully operational.

This value includes all support circuitry associated with

the hub (but does not include the current consumption of

any permanently attached peripherals if the hub is part

of a compound device).

The Hub supports Self-Powered and Bus-Powered

operation. The SELF_BUS_PWR bit (CONFIG_-

BYTE_1) defined in Section 5.3.7, "Register 06h: CON-

FIG_BYTE_1 - CFG1," on page 24 is used to determine

which of the stored values 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:

‘HC_MAX_C_BP’ if SELF_BUS_PWR = ‘0’

‘HC_MAX_C_SP’ if SELF_BUS_PWR = ‘1’

‘HC_MAX_C_BP/SP’ are defined in Section 5.3.15, and

Section 5.3.16, "Register 0Fh: Hub Controller Max Cur-

rent For Bus Powered Operation - HCMCB," on

page 28. In all cases the reported value is sourced from

the Hub Controller Max Current data field (for Self or

Bus power) that was determined by Internal Default, or

serial port load.

DeviceRemovable

user

Indicates if port has a removable device attached. See

Section 11.23.2.1 in the USB Specification.

The value contained in the ‘NR_DEVICE’ field is directly

reported to the host, and is determined by Internal

Default, or serial port load.

PortPwrCtrlMask

FFh

Field for backwards USB 1.0 compatibility.

TABLE 7-33:

CLASS-SPECIFIC HUB DESCRIPTOR (FULL-SPEED & HIGH-SPEED) (CONTINUED)

Offset

Field

Size

Value

Description

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