If the external interrupt line goes back to '0'(inactive) before the pc is updated, the reset vector will be loaded to the pc. This patch is will correct this behavious:

Index: AX8.vhd

--- AX8.vhd (revision 33) +++ AX8.vhd (working copy) @@ -182,6 +182,7 @@ signal RJmp : std_logic; signal CBranch : std_logic; signal Sleep : std_logic;

• signal Int_Trig_s : std_logic_vector(15 downto 1);

  begin

@@ -733,6 +734,7 @@ CInt <= "0000"; Int_Acc <= (others => '0'); IPending <= '0';

• 	Int_Trig_s <= (others => '0');

  elsif Clk'event and Clk = '1' then if Inst = "1001010110101000" then WDR <= '1'; @@ -745,25 +747,26 @@ if Int_Trig /= "000000000000000" and SREG_i(7) = '1' then Sleep <= '0'; IPending <= '1';

• 		Int_Trig_s <= Int_Trig;
  	end if;
  	Int_Acc <= (others => '0');
  	if IPending = '1' and IPush = '1' then
  		IPending <= '0';

• 		if Int_Trig(1) = '1' then CInt <= "0001"; Int_Acc(1) <= '1';

• 		elsif Int_Trig(2) = '1' then CInt <= "0010"; Int_Acc(2) <= '1';

• 		elsif Int_Trig(3) = '1' then CInt <= "0011"; Int_Acc(3) <= '1';

• 		elsif Int_Trig(4) = '1' then CInt <= "0100"; Int_Acc(4) <= '1';

• 		elsif Int_Trig(5) = '1' then CInt <= "0101"; Int_Acc(5) <= '1';

• 		elsif Int_Trig(6) = '1' then CInt <= "0110"; Int_Acc(6) <= '1';

• 		elsif Int_Trig(7) = '1' then CInt <= "0111"; Int_Acc(7) <= '1';

• 		elsif Int_Trig(8) = '1' then CInt <= "1000"; Int_Acc(8) <= '1';

• 		elsif Int_Trig(9) = '1' then CInt <= "1001"; Int_Acc(9) <= '1';

• 		elsif Int_Trig(10) = '1' then CInt <= "1010"; Int_Acc(10) <= '1';

• 		elsif Int_Trig(11) = '1' then CInt <= "1011"; Int_Acc(11) <= '1';

• 		elsif Int_Trig(12) = '1' then CInt <= "1100"; Int_Acc(12) <= '1';

• 		elsif Int_Trig(13) = '1' then CInt <= "1101"; Int_Acc(13) <= '1';

• 		elsif Int_Trig(14) = '1' then CInt <= "1110"; Int_Acc(14) <= '1';

• 		elsif Int_Trig(15) = '1' then CInt <= "1111"; Int_Acc(15) <= '1';

• 		if Int_Trig_s(1) = '1' then CInt <= "0001"; Int_Acc(1) <= '1';

• 		elsif Int_Trig_s(2) = '1' then CInt <= "0010"; Int_Acc(2) <= '1';

• 		elsif Int_Trig_s(3) = '1' then CInt <= "0011"; Int_Acc(3) <= '1';

• 		elsif Int_Trig_s(4) = '1' then CInt <= "0100"; Int_Acc(4) <= '1';

• 		elsif Int_Trig_s(5) = '1' then CInt <= "0101"; Int_Acc(5) <= '1';

• 		elsif Int_Trig_s(6) = '1' then CInt <= "0110"; Int_Acc(6) <= '1';

• 		elsif Int_Trig_s(7) = '1' then CInt <= "0111"; Int_Acc(7) <= '1';

• 		elsif Int_Trig_s(8) = '1' then CInt <= "1000"; Int_Acc(8) <= '1';

• 		elsif Int_Trig_s(9) = '1' then CInt <= "1001"; Int_Acc(9) <= '1';

• 		elsif Int_Trig_s(10) = '1' then CInt <= "1010"; Int_Acc(10) <= '1';

• 		elsif Int_Trig_s(11) = '1' then CInt <= "1011"; Int_Acc(11) <= '1';

• 		elsif Int_Trig_s(12) = '1' then CInt <= "1100"; Int_Acc(12) <= '1';

• 		elsif Int_Trig_s(13) = '1' then CInt <= "1101"; Int_Acc(13) <= '1';

• 		elsif Int_Trig_s(14) = '1' then CInt <= "1110"; Int_Acc(14) <= '1';

• 		elsif Int_Trig_s(15) = '1' then CInt <= "1111"; Int_Acc(15) <= '1';
  		end if;
  	end if;
  	if Inst = "1001010100011000" then