USB2513 SMSC Corporation, USB2513 Datasheet - Page 18

• Manufacturer Part Number: USB2513
• Description: USB 2.0 High-Speed 3-Port Hub Controller
• Manufacturer: SMSC Corporation

Chapter 4 Configuration Options
Revision 1.98 (11-19-07)
4.1
4.1.1
4.1.1.1
4.1.2
4.2
Available
Available
36 QFN
N/A
N/A
N/A
N/A
SMSC’s USB 2.0 3-Port Hub is fully specification compliant to the Universal Serial Bus Specification
Revision 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.
For performance reasons, the 3-Port Hub provides 1 Transaction Translator (TT) per port (defined as
Multi-TT configuration), divided into 4 non-periodic buffers per TT.
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
pin strapping option over-rides). In all cases, the configuration method will be determined by the
CFG_SEL2, CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.
Power Switching Polarity
The selection of active state “polarity” for the PRTPWR pins is made by a strapping option only (the
PRTPWR_POL pin).
Note: If PRTPWR_POL is not an available pin on the package, the hub will support active high power
VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),
Hub will remove power from the D+ pull-up resistor within 10 seconds.
3-Port Hub
36 QFN and 48 QFN Feature Differences
Available
Available
Available
Available
48 QFN
controllers only!
N/A
N/A
Table 4.1 36 QFN and 48 QFN Feature Differences
48MHz clock input mode
External 1.8V regulators
Port LED Indicators
Port Swap Strapping Options
Only Active High Port Power Control is supported in 36 QFN package
Boost Default Level is used; see
SMBus Register Memory Map"
DATASHEET
18
Table 4.2, "Internal Default, EEPROM and
FEATURE
USB 2.0 High-Speed 3-Port Hub Controller
SMSC USB2513
Datasheet