ISP1122ABD datasheet(15/48 Pages) PHILIPS

15 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

15 of 48

9397 750 06986

9.3 Descriptors

The ISP1122A hub controller supports the following standard USB descriptors:

• Device

• Conﬁguration

• Interface

• Endpoint

• Hub

• String.

Table 10: Device descriptor

Values in square brackets are optional.

Offset

(bytes)

Field name

Size

(bytes)

Value

(Hex)

Comments

bLength

descriptor length = 18 bytes

bDescriptorType

type = DEVICE

bcdUSB

10, 01

USB Speciﬁcation Rev. 1.1

bDeviceClass

HUB_CLASSCODE

bDeviceSubClass

bDeviceProtocol

bMaxPacketSize0

packet size = 64 bytes

idVendor

CC, 04

Philips Semiconductors vendor ID

(04CC); can be customized using an

external EEPROM (see Table 23)

idProduct

22, 11

ISP1122A product ID; can be

customized using an external

EEPROM (see Table 23)

bcdDevice

01, 01

device release 1.1; silicon revision

increments this value

iManufacturer

no manufacturer string (default)

[01]

manufacturer string enabled

(using an external EEPROM)

iProduct

no product string (default)

[02]

product string enabled

(using an external EEPROM)

iSerialNumber

no serial number string

bNumConﬁgurations

one conﬁguration

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