verilog/lm32/lm32_functions.v

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  37 //                         FILE DETAILS
  38 // Project      : LatticeMico32
  39 // File         : lm32_functions.v
  40 // Title        : Common functions
  41 // Version      : 6.1.17
  42 //              : Initial Release
  43 // Version      : 7.0SP2, 3.0
  44 //              : No Change
  45 // Version      : 3.5
  46 //              : Added function to generate log-of-two that rounds-up to
  47 //              : power-of-two
  48 // =============================================================================
  49
  50 function integer clogb2;
  51 input [31:0] value;
  52 begin
  53    for (clogb2 = 0; value > 0; clogb2 = clogb2 + 1)
  54         value = value >> 1;
  55 end
  56 endfunction
  57
  58 function integer clogb2_v1;
  59 input [31:0] value;
  60 reg   [31:0] i;
  61 reg   [31:0] temp;
  62 begin
  63    temp = 0;
  64    i    = 0;
  65    for (i = 0; temp < value; i = i + 1)
  66         temp = 1<<i;
  67    clogb2_v1 = i-1;
  68 end
  69 endfunction
  70