参数资料
型号: 20H04
厂商: SMSC Corporation
英文描述: 4-PORT USB2.0 HUB CONTROLLER
中文描述: 4端口USB2.0集线器控制器
文件页数: 30/38页
文件大小: 919K
代理商: 20H04
4-Port USB2.0 Hub Controller
Datasheet
Revision 1.63 (10-14-04)
Page 30
SMSC USB20H04
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 USB2.0 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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