1 Reply Latest reply on Jul 6, 2015 9:20 AM by user_14586677

    PRoC 24MHz Clock Selection

    atul.singh

      PRoC datasheet says that "24-MHz crystal or external clock input" at XTAL24I pin. I want to use external clock input. So :-

         

      1. What characterstics does the clock must have?

         

      2. In that case should XTAL24O pin be connected to ground?

         

      3. What necessary termination does this clock input needed at PRoC?

         

      I have read "AN95089" (www.cypress.com/). But didn't found answer of theses questions. Pls help.

        • 1. Re: PRoC 24MHz Clock Selection
          user_14586677

          1. What characterstics does the clock must have?

             

           

             

          From CYBL10X7X Family Datasheet

             

           

             

           

             

          2. In that case should XTAL24O pin be connected to ground?

             

           

             

          Looking at TRM there are no recommendations, suggest you file a CASE -

             

           

             

              

             

                   

             

          www.cypress.com

             

          “Support”

             

          “Technical Support”

             

          “Create a Case”

             

           

             

           

             

          3. What necessary termination does this clock input needed at PRoC?

             

           

             

          None, although you might consider 10 - 30 ohms in series to the clkin pin to

             

          dampen ringing. Normal practice on high speed clocks.

             

           

             

          Regards, Dana.