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6809: Added special command to inhibit IRQ/FIRQ/NMI

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Change-Id: I9b94fec5f464ecdb6bb0a4cd2a430401a182c929
This commit is contained in:
David Banks 2019-10-01 15:21:28 +01:00
parent a1591e4e97
commit 2a79bc6819
2 changed files with 17 additions and 7 deletions
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8
firmware/AtomBusMon.c
View File

@ -10,7 +10,7 @@
* VERSION and NAME are used in the start-up message
********************************************************/
#define VERSION "0.75"
#define VERSION "0.76"
#if (CPU == Z80)
#define NAME "ICE-T80"
@ -51,7 +51,7 @@ char *cmdStrings[] = {
#endif
"test",
"srec",
#if (CPU == 6502)
#if (CPU != Z80)
"special",
#endif
#endif
@ -94,7 +94,7 @@ void (*cmdFuncs[])(char *params) = {
#endif
doCmdTest,
doCmdSRec,
#if (CPU == 6502)
#if (CPU != Z80)
doCmdSpecial,
#endif
#endif
@ -1160,7 +1160,7 @@ void doCmdSRec(char *params) {
}
#if (CPU == 6502)
#if (CPU != Z80)
void logSpecial(char *function, int value) {
log0("%s", function);
if (value) {

16
src/MC6809ECpuMon.vhd
View File

@ -132,6 +132,7 @@ architecture behavioral of MC6809ECpuMon is
signal SS_Single : std_logic;
signal SS_Step : std_logic;
signal CountCycle : std_logic;
signal special : std_logic_vector(1 downto 0);
signal clk_count : std_logic_vector(1 downto 0);
signal quadrature : std_logic_vector(1 downto 0);
@ -166,6 +167,10 @@ architecture behavioral of MC6809ECpuMon is
signal sw_interrupt_n : std_logic; -- switch to pause the CPU
signal sw_reset_n : std_logic; -- switch to reset the CPU
signal NMI_n_masked : std_logic;
signal IRQ_n_masked : std_logic;
signal FIRQ_n_masked : std_logic;
begin
-- Generics allows polarity of switches/LEDs to be tweaked from the project file
@ -232,10 +237,15 @@ begin
DataOut => memory_dout,
DataIn => memory_din,
Done => memory_done,
Special => special,
SS_Step => SS_Step,
SS_Single => SS_Single
);
NMI_n_masked <= NMI_n or special(1);
FIRQ_n_masked <= FIRQ_n or special(1);
IRQ_n_masked <= IRQ_n or special(0);
-- The CPU is slightly pipelined and the register update of the last
-- instruction overlaps with the opcode fetch of the next instruction.
--
@ -290,9 +300,9 @@ begin
irq_gen : process(cpu_clk)
begin
if falling_edge(cpu_clk) then
NMI_sync <= not NMI_n;
IRQ_sync <= not IRQ_n;
FIRQ_sync <= not FIRQ_n;
NMI_sync <= not NMI_n_masked;
IRQ_sync <= not IRQ_n_masked;
FIRQ_sync <= not FIRQ_n_masked;
nRST_sync <= RES_n and nRSTout;
HALT_sync <= not HALT_n;
end if;