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This commit is contained in:
Raphael Jacquot 2019-02-04 18:00:08 +01:00
parent d743217132
commit 59186f6bf8
2 changed files with 37 additions and 29 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
saturn_core.json
rom_tb

65
saturn_core.v
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@ -578,7 +578,7 @@ endtask
begin
case (nibble)
//4'h5: inst_config();
//4'ha: inst_reset();
4'ha: decstate <= DECODE_RESET;
4'hc: decstate <= DECODE_C_EQ_P_N;
default:
begin
@ -608,43 +608,50 @@ task inst_config;
end_decode();
end
endtask
// 80A RESET
task inst_reset;
begin
$display("%05h RESET\t\t\t<= NOT IMPLEMENTED YET", saved_PC);
end_decode();
end
endtask
*/
/******************************************************************************
* 2n P= n
* 80A RESET
*
*
*/
if ((decstate == DECODE_RESET) & (runstate == RUN_DECODE))
begin
$display("%05h RESET\t\t\t<= NOT IMPLEMENTED YET", saved_PC);
runstate <= RUN_START;
decstate <= DECODE_START;
end
/******************************************************************************
* 80Cn C=P n
*
*
*/
if (decstate == DECODE_C_EQ_P_N)
case (runstate)
RUN_DECODE: runstate <= READ_ROM_STA;
READ_ROM_STA, READ_ROM_CLK, READ_ROM_STR: ;
READ_ROM_VAL:
begin
C[nibble*4+:4] <= P;
`ifdef SIM
$display("%05h C=P\t%h", saved_PC, nibble);
`endif
runstate <= RUN_START;
decstate <= DECODE_START;
end
default:
begin
`ifdef SIM
$display("DECODE_80C runstate %h", runstate);
`endif
halt <= 1;
end
endcase
/*
// 80Cn C=P n
task inst_c_eq_p_n;
case (decstate )
DECODE_80:
begin
decstate <= DECODE_C_EQ_P_N;
read_state <= READ_START;
end
DECODE_C_EQ_P_N:
if (read_state != READ_VALID) read_rom();
else
begin
$display("%05h C=P\t%h", saved_PC, nibble);
C[nibble*4+:4] <= P;
end_decode();
end
endcase
endtask
task decode_82;
case (decstate )