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TMS570LC4357-EP: ENCODER

Part Number: TMS570LC4357-EP

IAM using   example code of quadrature encoder  , iam giving  quadrature pulse  square wave w ith 90 degree phase shift , where clk frequency =  75Mhz,  PPR =30 ,  time period  store in register  QCPRD  is  value  is  not  getting constant range its varying to high  , can anyone help me short out this problem for help to find frequency .