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Z80: support interrupt masking in hardware

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Change-Id: I97683cc03e9d65e496e5f9f2ee366cc0bc18087b
This commit is contained in:
David Banks 2019-10-25 17:14:27 +01:00
parent a29aa3015a
commit ac521aad15
1 changed files with 4 additions and 2 deletions
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6
src/Z80CpuMon.vhd
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@ -109,6 +109,7 @@ type state_type is (idle, resume, nop_t1, nop_t2, nop_t3, nop_t4, rd_t1, rd_wa,
signal SS_Step : std_logic;
signal SS_Step_held : std_logic;
signal CountCycle : std_logic;
signal special : std_logic_vector(1 downto 0);
signal skipNextOpcode : std_logic;
signal Regs : std_logic_vector(255 downto 0);
@ -252,6 +253,7 @@ begin
DataOut => memory_dout,
DataIn => memory_din,
Done => memory_done,
Special => special,
SS_Single => SS_Single,
SS_Step => SS_Step
);
@ -292,8 +294,8 @@ begin
int_gen : process(CLK_n)
begin
if rising_edge(CLK_n) then
NMI_n_sync <= NMI_n;
INT_n_sync <= INT_n;
NMI_n_sync <= NMI_n or special(1);
INT_n_sync <= INT_n or special(0);
end if;
end process;