twe_counter.tdf

在MAXPLUS II 平台上用ahdl 写的电子钟

subdesign twe_counter
(clk,clrn:input;
 out[3..0],out4:output;
)
variable
ss:MACHINE OF BITS (out[4..0])
   with states(
    s0=0,
    s1=1,
    s2=2,
    s3=3,
    s4=4,
    s5=5,
    s6=6,
    s7=7,
    s8=8,
    s9=9,
    s10=B"10000",
    s11=B"10001"
);
begin
  if clrn==0 then 
  out[4..0]=0;
  else
  ss.clk=clk;
  table 
   ss  =>  ss;
   s0  =>  s1;
   s1  =>  s2;
   s2  =>  s3;
   s3  =>  s4;
   s4  =>  s5;
   s5  =>  s6;
   s6  =>  s7;
   s7  =>  s8;
   s8  =>  s9;
   s9  =>  s10;
   s10 =>  s11;
   s11 =>  s0;
   end table;
  end if;
 end;