USB3503 datasheet(49/82 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

Chapter 7 USB Descriptors

A customer can indirectly affect which descriptors are reported via one of two methods. The two

methods are: Internal Default ROM Configuration, or direct load through the serial port interface.

The SMSC Hub will not electrically attach to the USB until after it has loaded valid data for all user-

defined descriptor fields (either through Internal Default ROM, or serial port).

7.1

USB Bus Reset

In response to the upstream port signaling a reset to the Hub, the Hub does the following:

Note 7.1

The Hub does not propagate the upstream USB reset to downstream devices.

— Sets default address to 0.

— Sets configuration to: Unconfigured.

— Negates PRTPWR[3:1] register for all downstream ports.

— Clears all TT buffers.

— Moves device from suspended to active (if suspended).

— Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the

reset sequence.

The Host then configures the Hub and the Hub's downstream port devices in accordance with the USB

Specification.

7.2

Hub Attached as a High-Speed Device (Customer-Configured

for Single-TT Support Only)

The following tables provide descriptor information for Customer-Configured Single-TT-Only Hubs

attached for use with High-Speed devices.

7.2.1

Standard Device Descriptor

The following table provides device descriptor values for High-Speed operation.

Table 7.1 Device Descriptor

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

Length

12h

Size of this Descriptor.

DescriptorType

01h

Device Descriptor Type.

USB

0200h

USB Specification Release Number.

DeviceClass

09h

Class code assigned by USB-IF for Hubs.

DeviceSubClass

00h

Class code assigned by USB-IF for Hubs.

DeviceProtocol

01h

Protocol Code.

MaxPacketSize0

40h

64-byte packet size.

Vendor

user/

default

Vendor ID; Customer value defined in ROM or serial

port load.

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