在verilog中使用clogb2函数可进行log2操作，用来计算数据位宽

//function called clogb2 that returns an integer which has the

//value of the ceiling of the log base 2.

function integer clogb2 (input integer bit_depth);

begin

for(clogb2=0; bit_depth>0; clogb2=clogb2+1)

bit_depth = bit_depth>>1;

end

endfunction

//************************************************************************

 

localparam WIDTH_SRL = 32; 

localparam WIDTH_CNT = clogb2(WIDTH_SRL/8-1);

在verilog中使用clogb2函数可进行log2操作，用来计算数据位宽