Datasheet, 2 usb reset – SMSC USB20H04 User Manual
Page 27
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4-Port USB 2.0 Controller
Datasheet
SMSC USB20H04
Page 27
Revision 1.63 (03-30-07)
DATASHEET
8.4.2 USB
Reset
When the upstream host signals a reset, the USB20H04 does the following:
Note:
The USB20H04 does not propagate the upstream USB Reset to downstream devices!
1. Sets default address to 0
2. Sets
configuration to: un-configured
3. Negates VBUSx_N (where x stands for the port number) 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.
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