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cputypes.vhdl
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cputypes.vhdl
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library ieee;
use Std.TextIO.all;
use ieee.STD_LOGIC_1164.all;
use ieee.numeric_std.all;
package cputypes is
type sprite_vector_8 is array(0 to 7) of unsigned(7 downto 0);
type addressingmode is (
M_impl,M_InnX,M_nn,M_immnn,M_A,M_nnnn,M_nnrr,
M_rr,M_InnY,M_InnZ,M_rrrr,M_nnX,M_nnnnY,M_nnnnX,M_Innnn,
M_InnnnX,M_InnSPY,M_nnY,M_immnnnn);
type mode_list is array(addressingmode'low to addressingmode'high) of integer;
type instruction is (
-- 4510 opcodes
I_ADC,I_AND,I_ASL,I_ASR,I_ASW,I_BBR,I_BBS,I_BCC,
I_BCS,I_BEQ,I_BIT,I_BMI,I_BNE,I_BPL,I_BRA,I_BRK,
I_BSR,I_BVC,I_BVS,I_CLC,I_CLD,I_CLE,I_CLI,I_CLV,
I_CMP,I_CPX,I_CPY,I_CPZ,I_DEC,I_DEW,I_DEX,I_DEY,
I_DEZ,I_EOM,I_EOR,I_INC,I_INW,I_INX,I_INY,I_INZ,
I_JMP,I_JSR,I_LDA,I_LDX,I_LDY,I_LDZ,I_LSR,I_MAP,
I_NEG,I_ORA,I_PHA,I_PHP,I_PHW,I_PHX,I_PHY,I_PHZ,
I_PLA,I_PLP,I_PLX,I_PLY,I_PLZ,I_RMB,I_ROL,I_ROR,
I_ROW,I_RTI,I_RTS,I_SBC,I_SEC,I_SED,I_SEE,I_SEI,
I_SMB,I_STA,I_STX,I_STY,I_STZ,I_TAB,I_TAX,I_TAY,
I_TAZ,I_TBA,I_TRB,I_TSB,I_TSX,I_TSY,I_TXA,I_TXS,
I_TYA,I_TYS,I_TZA,
-- 6502 illegals
I_SLO,I_RLA,I_SRE,I_RRA,I_SAX,I_LAX,I_DCP,I_ISC,
I_ANC,I_ALR,I_ARR,I_XAA,I_AXS,I_AHX,I_SHY,I_SHX,
I_TAS,I_LAS,I_NOP,I_KIL
);
type ilut9bit is array(0 to 511) of instruction;
type microcodeops is record
-- Do we increment PC?
mcIncPC : std_logic;
-- Decrement PC (to fix PC following stack operations)
mcDecPC : std_logic;
-- How shall we exit this instruction?
mcInstructionFetch : std_logic;
mcInstructionDecode : std_logic;
-- Mark instruction RMW
mcRMW : std_logic;
-- 16bit operations
mcWordOp : std_logic;
mcBRK : std_logic;
-- Set NZ based on currently read memory
mcSetNZ : std_logic;
-- And registers
mcSetA : std_logic;
mcSetX : std_logic;
mcSetY : std_logic;
mcSetZ : std_logic;
-- Do we write registers to memory?
mcStoreA : std_logic;
mcStoreP : std_logic;
mcStoreX : std_logic;
mcStoreY : std_logic;
mcStoreZ : std_logic;
mcStoreTRB : std_logic;
mcStoreTSB : std_logic;
mcTestAZ : std_logic;
mcDelayedWrite : std_logic;
mcWriteMem : std_logic;
mcWriteRegAddr : std_logic;
mcPop : std_logic;
mcBreakFlag : std_logic;
-- Special instructions
mcJump : std_logic;
mcMap : std_logic;
mcClearI : std_logic;
mcClearE : std_logic;
mcStackA : std_logic;
mcStackP : std_logic;
mcStackX : std_logic;
mcStackY : std_logic;
mcStackZ : std_logic;
mcADC : std_logic;
mcAND : std_logic;
mcORA : std_logic;
mcEOR : std_logic;
mcASL : std_logic;
mcASR : std_logic;
mcLSR : std_logic;
mcBIT : std_logic;
mcSBC : std_logic;
mcCMP : std_logic;
mcCPX : std_logic;
mcCPY : std_logic;
mcCPZ : std_logic;
mcDEC : std_logic;
mcINC : std_logic;
mcROL : std_logic;
mcROR : std_logic;
mcRMB : std_logic;
mcSMB : std_logic;
end record;
type microcoderom_t is array (instruction) of microcodeops;
end cputypes;