mister-devel/PC88_MiSTer
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Quick fix to avoid missing interrupts.

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The interrupt sampling point is the rising edge of IORQ, so hold DATOUT until IORQ goes high.
This commit is contained in:
yosinda
2024-11-30 13:34:07 +09:00
parent 1357239ef1
commit fa00a0a228
1 changed files with 7 additions and 5 deletions
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12
rtl/INTCONTS.vhd
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@@ -141,8 +141,9 @@ begin
INTCLR<='0';
SEND<='0';
elsif(clk' event and clk='1')then
INTCLR<='0';
-- INTCLR<='0';
if(INTing/=3)then
INTCLR<='0';
INTen:='0';
for i in 7 downto 0 loop
if(INTRQm(i)='1')then
@@ -169,21 +170,22 @@ begin
DATOUT(7 downto 4)<=x"0";
DATOUT(3 downto 1)<=conv_std_logic_vector(INTx,3);
DATOUT(0)<='0';
INTCLRN<=INTx;
-- VECOE<='1';
if(M1nb='0')then
INTing<=3;
end if;
when 3 =>
if(M1nb='1' and M1nc='1')then
if(SEND='1')then
if(SEND='0')then
INTing<=1;
elsif(IORQn='1')then -- Holds DATOUT until sampled by CPU
INTn<='1';
INTing<=0;
-- VECOE<='0';
INTCLRN<=INTx;
-- INTCLRN<=INTx;
INTCLR<='1';
SEND<='0';
else
INTing<=1;
end if;
elsif(IORQn='0')then
SEND<='1';