(no subject)

Hi 
I am using USB type b v2 in full speed using  microcontroller pic18f4550  I will be designing double sided pcb I
have following query 

1 are there any layout guidelines for USB v2 full speed ? 
2 will the USB trace d+ d- needs to be impedance controlled ?
3 if yes then what should be the impedance for double sided pcb and how to calculate it. ?

I read about guidelines for high speed but not sure if that's same for full speed ?
Thanks for the help...

Best regard
Andy------------------------------------------------------------------
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