| Line 128... |
Line 128... |
constant OP_LDA : OPCODE_TYPE := "11101";
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constant OP_LDA : OPCODE_TYPE := "11101";
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constant OP_LDX : OPCODE_TYPE := "11110";
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constant OP_LDX : OPCODE_TYPE := "11110";
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constant OP_LDO : OPCODE_TYPE := "11111";
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constant OP_LDO : OPCODE_TYPE := "11111";
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-- OP_STK uses the lower 3 bits to further refine the instruction by
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-- OP_STK uses the lower 3 bits to further refine the instruction by
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-- repurposing the source register field. These "sub opcodes" are
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-- repurposing the source register field. These "sub opcodes" take
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-- take the place of the register select for the OP_STK opcode
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-- the place of the register select for the OP_STK opcode
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constant SOP_RSP : SUBOP_TYPE := "000";
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constant SOP_RSP : SUBOP_TYPE := "000";
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constant SOP_RTS : SUBOP_TYPE := "001";
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constant SOP_RTS : SUBOP_TYPE := "001";
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constant SOP_RTI : SUBOP_TYPE := "010";
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constant SOP_RTI : SUBOP_TYPE := "010";
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constant SOP_BRK : SUBOP_TYPE := "011";
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constant SOP_BRK : SUBOP_TYPE := "011";
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constant SOP_JMP : SUBOP_TYPE := "100";
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constant SOP_JMP : SUBOP_TYPE := "100";
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| Line 154... |
Line 154... |
-- 2-cycle math
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-- 2-cycle math
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MUL_C1, UPP_C1,
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MUL_C1, UPP_C1,
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-- Stack
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-- Stack
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PSH_C1, POP_C1, POP_C2, POP_C3, POP_C4,
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PSH_C1, POP_C1, POP_C2, POP_C3, POP_C4,
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-- Subroutines & Interrupts
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-- Subroutines & Interrupts
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WAIT_FOR_INT, ISR_C1, ISR_C2, ISR_C3, JSR_C1, JSR_C2,
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WAIT_FOR_INT,
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ISR_C1, ISR_C2, ISR_C3, JSR_C1, JSR_C2,
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RTS_C1, RTS_C2, RTS_C3, RTS_C4, RTS_C5, RTI_C6,
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RTS_C1, RTS_C2, RTS_C3, RTS_C4, RTS_C5, RTI_C6,
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-- Debugging
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-- Debugging
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BRK_C1 );
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BRK_C1 );
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type CACHE_MODES is (CACHE_IDLE, CACHE_INSTR, CACHE_OPER1, CACHE_OPER2,
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type CACHE_MODES is (CACHE_IDLE, CACHE_INSTR, CACHE_OPER1, CACHE_OPER2,
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| Line 236... |
Line 237... |
constant PSR_Z : integer := 0;
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constant PSR_Z : integer := 0;
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constant PSR_C : integer := 1;
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constant PSR_C : integer := 1;
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constant PSR_N : integer := 2;
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constant PSR_N : integer := 2;
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constant PSR_I : integer := 3;
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constant PSR_I : integer := 3;
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constant PSR_GP4 : integer := 4;
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constant PSR_GP4 : integer := 4;
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constant PSR_GP5 :
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constant PSR_GP5 : integer := 5;
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constant PSR_GP6 : integer := 6;
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constant PSR_GP7 : integer := 7;
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type ALU_CTRL_TYPE is record
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Oper : OPCODE_TYPE;
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Reg : SUBOP_TYPE;
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end record;
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constant ACCUM : SUBOP_TYPE := "000";
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type REGFILE_TYPE is array (0 to 7) of DATA_TYPE;
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subtype FLAG_TYPE is DATA_TYPE;
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end Open8_pkg;
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package body Open8_pkg is
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end package body;
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