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USB20H04-JD Datasheet(PDF) 27 Page - SMSC Corporation

Part # USB20H04-JD
Description  4-PORT USB 2.0 HUB CONTROLLER
PDF  35 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB20H04-JD Datasheet(HTML) 27 Page - SMSC Corporation

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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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