SMSC USB2502 User Manual

2-Port USB 2.0 Hub Controller

Revision 2.3 (08-27-07)

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SMSC USB2502

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

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 to all downstream ports.

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

sequence.

The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB
Specification.