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USB2.0 Driver & differential receiver blocks

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Hello ,
Can any body provide info for below questions
1) LS/FS Drver & receivers are true differential type? or normal individual buffers operates at avoltage level of 3V
what is the internal block diagrams

2) it imposes strict restriction on Rise/Fall times so does it use any Slew controlled buffers by the way?

3)what is the Voltages that USB2.0 supports ? does it port it to VCC of 1.0V,1.2V,1.5V...3.0V ? or only 3.0V

Thanks in advance
 

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