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Regarding the input sensitivity of the USB RX

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asicpark

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Hi all,

I am looking at the USB 1.1 Spec, but I can't understand the input sensitivity of 200mv between D+ and D-. Does it mean that the data transition should be occured within 200mv of differencial voltage or when exceeding 200mV?
Also, I don't know exactly about the common mode range. I just think that the input of the receiver can operate withein that range, am I right?

Thank in advance
 

On low and full speed devices, a differential ‘1’ is transmitted by pulling D+ over 2.8V with a 15K ohm resistor pulled to ground and D- under 0.3V with a 1.5K ohm resistor pulled to 3.6V. A differential ‘0’ on the other hand is a D- greater than 2.8V and a D+ less than 0.3V with the same appropriate pull down/up resistors.

The receiver defines a differential ‘1’ as D+ 200mV greater than D- and a differential ‘0’ as D+ 200mV less than D-.
Click to expand...
**broken link removed**

Rgards,
IanP
 

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