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MSP430F5637: Topic : MSP430 USB performance

Part Number: MSP430F5637

Hi,
 
I am sorry for asking general question on MSP430 USB.
 
Q1) USB data transmission time:
When a data is sent from the USB Buffer RAM to the bus line (DM/DP),
the Theoretical maximum transfer rate for MSP430 USB is 12MHz(8.3ns).
but in practical what could be the potential limitations on the MSP430 side 
that could effect the performance when communicating with the HOST?
 
Q2) USB disable function:
When changing from USB active to USB_Disable(),
can we assume the USB 5V ports could be used as a normal GPIO ports
and the port voltage changes from 5V to 3.3V?
 
Best Regards,

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