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USB Superspeed Peripherals

lechc_282591
New Contributor

Hello, I changed the crystal(19.2MHz) to oscillator. The voltage amplitude of the clock signal(clkin) on my board is 0.8V(19.2MHz)and the board is not working now. My question is that what should the voltage level of the clock be. 0.8V is too low or sufficient?

   

Thank you 

   

Lehua Chen  

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3 Replies
lechc_282591
New Contributor

I check it by applying external clock to the Clkin pin on the FX3 evaluation board. The amplitude of the clock (19.2MHz) should be larger than 1.8V. Otherwise, the chip will not work. Thanks

   

Lehua Chen

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Anonymous
Not applicable

many times  mine is  0.5-1.5V  or  less  than 2v     ,but  it is  work  normal

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Anonymous
Not applicable

I am seeing around 0.8V on my working board.

   

Thanks,

   

sai krishna.

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