Справочник Пользователя для SMSC USB2513B

USB 2.0 Hi-Speed Hub Controller

SMSC USB251x

33

Revision 1.0 (3-11-09)

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.

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 

0

0

0

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

0

0

1

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

0

1

0

Internal Default Configuration

„

Strap options enabled

„

Bus-powered operation

„

LED mode = USB (when available on package)

„

Individual power switching

„

Individual over-current sensing

0

1

1

2-Wire  I

2

C EEPROMS are supported

„

Strap options disabled

„

All settings are controlled by registers as set by the user