USB2513 datasheet(33/72 Pages) SMSC

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USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251x

Revision 1.0 (3-11-09)

DATASHEET

Chapter 8 Configuration Options

8.1

Hub

SMSC’s USB 2.0 hub is fully specification compliant to the Universal Serial Bus specification, version

2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub specification)

for general details regarding hub operation and functionality.

The hub provides 1 Transaction Translator (TT) that is shared by both downstream ports (defined as

Single-TT configuration), The TT contains 4 non-periodic buffers.

8.1.1

Hub Configuration Options

The SMSC hub supports a large number of features (some are mutually exclusive), and must be

configured in order to correctly function when attached to a USB host controller. There are three

principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without

configuration option over-rides). In all cases, the configuration method will be determined by the

CFG_SEL[2], CFG_SEL[1] and CFG_SEL[0] pins immediately after RESET_N negation. Please refer

to Table 8.1, "Hub Configuration Options" for more information.

8.1.2

SMBus or EEPROM Interface

Table 8.1 Hub Configuration Options

CFG_SEL[2]

CFG_SEL[1]

CFG_SEL[0]

DESCRIPTION

Internal Default Configuration without any over-rides

Strap options enabled

Self-powered operation enabled

LED mode = Speed (when available on package)

Individual power switching

Individual over-current sensing

Configured as an SMBus slave for external download of

user-defined descriptors

Strap options disabled

All settings are controlled by registers as set by the user

Internal Default Configuration

Strap options enabled

Bus-powered operation

LED mode = USB (when available on package)

Individual power switching

Individual over-current sensing

2-Wire I2C EEPROMS are supported

Strap options disabled

All settings are controlled by registers as set by the user

USB2513 Datasheet(PDF) 33 Page - SMSC Corporation

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