8 Replies Latest reply on Apr 28, 2015 6:08 AM by user_483670151

    Peripherals / master clock influence at CPU clock

    user_483670151

      Hi

         

      We are new to PSoC, and currently investigating it for a new project, where we need shift registers to clock data in and out.

         

      We compiled the shiftreg example project, changing it to 32 bit wide, and setting master / bus clock to 66MHz.. STA reports setup violation and f max is 53MHz.. Lowering the master / bus clock to 48MHz removes the violation.

         

      According to doc. bus / CPU clock must be equal or lover than master clock ( UDB clock ? ). It looks like the use of UDB's and perhaps other peripherals will put restrictions to the CPU speed ?

         

      Is this really correct, or am i missing something

         

       

         

      Thanks

         

      Geert