sout1<=tsr(0); --数据位
              tsr(6 downto 0):=tsr(7 downto 1);
              tsr(7):='0';
              txcnt_r<=txcnt_r+1;
              if (txcnt_r=7) then
                 state<=odd1;cou<=cou+1;
              end if;
         when odd1=>         --奇校验位
              if ddb='1' then
                 sout1<='0';state<=stop1;
              else
                 sout1<='1';state<=stop1;
              end if;
         when stop1=>
              sout1<='1';    --停止位
              if cou<4 then
                 state<=start1;
              else
                 state<=start2;                             
              end if;
         when start2=>
              tsr1:=thr(15 downto 8);
     oddb2:=thr(15 downto 8); 
              sout1<='0';    --起始位  
              txcnt_r<=(others=>'0'); 
              state<=shift2;
         when shift2=>
              oddb<=oddb2(7) xor oddb2(6) xor oddb2(5) xor oddb2(4) xor oddb2(3) xor oddb2(2) xor oddb2(1) xor oddb2(0);
              sout1<=tsr1(0);--数据位
              tsr1(6 downto 0):=tsr1(7 downto 1);
              tsr1(7):='0';
              txcnt_r<=txcnt_r+1; 
              if (txcnt_r=7) then
                 state<=odd2;               
              end if;
         when odd2=>       --奇校验位
 if ddb='1' then
                 sout1<='0';state<=stop2;
              else
                 sout1<='1';state<=stop2;
              end if; 

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