EVB-USB2514QFN48 SMSC, EVB-USB2514QFN48 Datasheet - Page 60

• Manufacturer Part Number: EVB-USB2514QFN48
• Description: BOARD EVAL FOR USB2514 48-QFN
• Manufacturer: SMSC

Specifications of EVB-USB2514QFN48

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: No
• Utilized Ic / Part: USB2514, USB2514I
• Primary Attributes: Quad Port Hub, High Speed (480Mbps), I2C/SMBus
• Secondary Attributes: Overcurrent Protection, Port Power Switching, ESD Protection
• Interface Type: USB
• Product: Interface Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: USB2514
• Other names: EVB-USB2514GFN48; Q4128965

Revision 1.1 (04-26-10)
8.7.2
USB Bus Reset
In response to the upstream port signaling a reset to the hub, the hub does the following:
Note: The hub does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN) is enabled.
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
6. Complies with Section 11.10 of the USB 2.0 specification for behavior after completion of the reset
Note: The hub does not propagate the upstream USB reset to downstream devices.
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.
All power supplies must have reached the operating levels mandated in
prior to (or coincident with) the assertion of RESET_N.
sequence. The host then configures the hub and the hub’s downstream port devices in accordance
with the USB specification.
DATASHEET
60
USB 2.0 Hi-Speed Hub Controller
Chapter 9, DC
SMSC USB251x
Parameters,
Datasheet