pwm_reg_pack.vhd

   1 library ieee;
   2     use ieee.std_logic_1164.all;
   3     use ieee.numeric_std.all;
   4     use ieee.math_real.all;
   5
   6 package pwm_reg_pack  is
   7
   8 -------------------------------------------------------------------------
   9 -- Data size definitions
  10 -------------------------------------------------------------------------
  11     constant SYS_CLK                                    : natural := 100_000;           -- System clock in kHz
  12     constant PWM_CLK                                    : natural := 500;                       -- PWM clock in kHz
  13     constant DUTY_CYCLE_W                               : natural := 5;                         -- PWM resolution in bits
  14     constant PERIOD                                     : natural := SYS_CLK / (PWM_CLK * 2**DUTY_CYCLE_W);
  15     constant PERIOD_W                                   : natural := integer(ceil(log2(real(PERIOD+1))));
  16
  17 end pwm_reg_pack;