Controllable Arbitrary Integer Frequency Divider Based on VHDL

The key technique for the design of a frequency divider is to find a function between the input and output. In general, the design process and circuit of a frequency divider is complicated, modification and transplantation for it is difficult. A creative design method of CAIFD (Controllable Arbitrary Integer Frequency Divider) is presented in this paper, which uses the VHDL (VHSIC Hardware Description Language ) source code to synthesize a FPGA (Field Programmable Gate Array) or a CPLD (Complex Programmable Logic Device) circuit that produces a 50% duty cycle n (n is a integer and n>0 ) controllable waveform. In order to validate the design method, CAIFD which has different frequency coefficients is simulated in device of ALTERA Corporation´s EP2S15F484C3. Results of the experiment shows that modification and transplantation of CAIFD is easy, moreover the performance is steady and reliable.