control.vhd

一个关于4路CAN卡的硬件程序,用VHDL编写

    
	   if commanda(1)='0' then
            bcd_a_up<=0;
	   elsif ior'event and ior='1' then 
	        if aen&sa(16 downto 0)="0000000"&base_address&"00001" then
                 bcd_a_up<=bcd_a_up+1;
            end if;
	   end if;
end process;
process(ior,commandb)
begin
    if commandb(1)='0' then
            bcd_b_up<=0;
    elsif ior'event and ior='1' then 
	   if aen&sa(16 downto 0)="0000000"&base_address&"00001" then
            bcd_b_up<=bcd_b_up+1;
       end if;
    end if;	
end process;
process(ior,aen,sa,base_address,bcd_a_down,bcd_a_up)
begin
        if aen&sa(16 downto 0)="0000000"&base_address&"00011" and ior='0' then
	        sd(3 downto 0)<=conv_std_logic_vector(bcd_a_down,4);
		    sd(7 downto 4)<=conv_std_logic_vector(bcd_a_up,4);          --上行段操作数无法回读
	    else
            sd<=(others=>'Z');
	    end if;
end process;
process(ior,aen,sa,base_address,bcd_b_down,bcd_b_up)
begin
		if aen&sa(16 downto 0)="0000000"&base_address&"00111" and ior='0' then
	        sd(3 downto 0)<=conv_std_logic_vector(bcd_b_down,4);
		    sd(7 downto 4)<=conv_std_logic_vector(bcd_b_up,4);          --上行段操作数无法回读
	    else
            sd<=(others=>'Z');
	    end if;
end process;	    
--************************************************************************************************
process(ior,aen,sa,base_address,stata)
begin
		if aen&sa(16 downto 0)="0000000"&base_address&"00010" and ior='0' then
	        sd(4 downto 0)<=stata;
		else
            sd(4 downto 0)<="ZZZZZ";
	    end if;
end process;


    
process(rstdrv,mcu_command_a)
begin
    if rstdrv='1' then 
	    wr_a_up<=0;
	elsif mcu_command_a(1)'event and mcu_command_a(1)='0' then
	    if stata(3)='0' then
		    if wr_a_up=7990 then
			    wr_a_up<=0;
			else
			    wr_a_up<=wr_a_up+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,commanda)
begin
    if rstdrv='1' then
	    rd_a_up<=7990;
	elsif commanda(1)'event and commanda(1)='1' then
	    if stata(1)='1' then
		    if rd_a_up=7990 then
			    rd_a_up<=0;
			else
			    rd_a_up<=rd_a_up+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    stata(1)<='0';
	elsif sysclk'event and sysclk='1' then
        if (rd_a_up=wr_a_up-10 or (rd_a_up=7990 and wr_a_up=0)) and commanda(1)='1' then
		    stata(1)<='0';
		elsif stata(1)='0' and (rd_a_up/=wr_a_up-10 and not(rd_a_up=7990 and wr_a_up=0)) then
		    stata(1)<='1';
		end if;
    end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    stata(3)<='0';
    elsif sysclk'event and sysclk='1' then
	    if wr_a_up=rd_a_up and mcu_command_a(1)='1' then
		    stata(3)<='1';
		elsif stata(3)='1' and commanda(1)='1' then
		    stata(3)<='0';
		end if;
	end if;
end process;

ara<=conv_std_logic_vector(wr_a_up,14);
--******************************************************************************************
process(rstdrv,commanda)
begin
    if rstdrv='1' then 
	    wr_a_down<=0;
	elsif commanda(0)'event and commanda(0)='0' then
	    if stata(0)='0' then
		    if wr_a_down=7990 then
			    wr_a_down<=0;
			else
			    wr_a_down<=wr_a_down+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,mcu_command_a)
begin
    if rstdrv='1' then
	    rd_a_down<=7990;
	elsif mcu_command_a(0)'event and mcu_command_a(0)='1' then
	    if stata(4)='1' then
		    if rd_a_down=7990 then
			    rd_a_down<=0;
			else
			    rd_a_down<=rd_a_down+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    stata(4)<='0';
	elsif sysclk'event and sysclk='1' then
        if (rd_a_down=wr_a_down-10 or (rd_a_down=7990 and wr_a_down=0)) and mcu_command_a(0)='1' then
		    stata(4)<='0';
		elsif stata(4)='0' and (rd_a_down/=wr_a_down-10 and not(rd_a_down=7990 and wr_a_down=0)) then
		    stata(4)<='1';
		end if;
    end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    stata(0)<='0';
    elsif sysclk'event and sysclk='1' then
	    if wr_a_down=rd_a_down and commanda(0)='1' then
		    stata(0)<='1';
		elsif stata(0)='1' and mcu_command_a(0)='1' then
		    stata(0)<='0';
		end if;
	end if;
end process;
--************************************************************************************************
process(ior,aen,sa,base_address,statb)
begin
		if aen&sa(16 downto 0)="0000000"&base_address&"00110" and ior='0' then
	        sd(4 downto 0)<=statb;
		else
            sd(4 downto 0)<="ZZZZZ";
	    end if;
end process;


    
process(rstdrv,mcu_command_b)
begin
    if rstdrv='1' then 
	    wr_b_up<=0;
	elsif mcu_command_b(1)'event and mcu_command_b(1)='0' then
	    if statb(3)='0' then
		    if wr_b_up=7990 then
			    wr_b_up<=0;
			else
			    wr_b_up<=wr_b_up+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,commandb)
begin
    if rstdrv='1' then
	    rd_b_up<=7990;
	elsif commandb(1)'event and commandb(1)='1' then
	    if statb(1)='1' then
		    if rd_b_up=7990 then
			    rd_b_up<=0;
			else
			    rd_b_up<=rd_b_up+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    statb(1)<='0';
	elsif sysclk'event and sysclk='1' then
        if (rd_b_up=wr_b_up-10 or (rd_b_up=7990 and wr_b_up=0)) and commandb(1)='1' then
		    statb(1)<='0';
		elsif statb(1)='0' and (rd_b_up/=wr_b_up-10 and not(rd_b_up=7990 and wr_b_up=0)) then
		    statb(1)<='1';
		end if;
    end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    statb(3)<='0';
    elsif sysclk'event and sysclk='1' then
	    if wr_b_up=rd_b_up and mcu_command_b(1)='1' then
		    statb(3)<='1';
		elsif statb(3)='1' and commandb(1)='1' then
		    statb(3)<='0';
		end if;
	end if;
end process;
--******************************************************************************************
process(rstdrv,commandb)
begin
    if rstdrv='1' then 
	    wr_b_down<=0;
	elsif commandb(0)'event and commandb(0)='0' then
	    if statb(0)='0' then
		    if wr_b_down=7990 then
			    wr_b_down<=0;
			else
			    wr_b_down<=wr_b_down+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,mcu_command_b)
begin
    if rstdrv='1' then
	    rd_b_down<=7990;
	elsif mcu_command_b(0)'event and mcu_command_b(0)='1' then
	    if statb(4)='1' then
		    if rd_b_down=7990 then
			    rd_b_down<=0;
			else
			    rd_b_down<=rd_b_down+10;
			end if;
		end if;
	end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    statb(4)<='0';
	elsif sysclk'event and sysclk='1' then
        if (rd_b_down=wr_b_down-10 or (rd_b_down=7990 and wr_b_down=0)) and mcu_command_b(0)='1' then
		    statb(4)<='0';
		elsif statb(4)='0' and (rd_b_down/=wr_b_down-10 and not(rd_b_down=7990 and wr_b_down=0)) then
		    statb(4)<='1';
		end if;
    end if;
end process;

process(rstdrv,sysclk)
begin
    if rstdrv='1' then
	    statb(0)<='0';
    elsif sysclk'event and sysclk='1' then
	    if wr_b_down=rd_b_down and commandb(0)='1' then
		    statb(0)<='1';
		elsif statb(0)='1' and mcu_command_b(0)='1' then
		    statb(0)<='0';
		end if;
	end if;
end process;

process(ior,iow,aen,sa,base_address,rd_a_up,bcd_a_up,wr_a_down,bcd_a_down,rd_b_up,bcd_b_up,wr_b_down,bcd_b_down)
begin
    if aen&sa(16 downto 0)="0000000"&base_address&"00001" and ior='0' then
	    al(13)<='0';
		al(12 downto 0)<=conv_std_logic_vector(rd_a_up+bcd_a_up,13);
	elsif aen&sa(16 downto 0)="0000000"&base_address&"00001" and iow='0' then
	    al(13)<='1';
		al(12 downto 0)<=conv_std_logic_vector(wr_a_down+bcd_a_down,13);
	elsif aen&sa(16 downto 0)="0000000"&base_address&"00101" and ior='0' then
        al(13)<='0';
		al(12 downto 0)<=conv_std_logic_vector(rd_b_up+bcd_b_up,13);
	else
	    al(13)<='1';
		al(12 downto 0)<=conv_std_logic_vector(wr_b_down+bcd_b_down,13);
	end if;
end process;



	    
	    
    



end body_control;