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-- Seth Henry 10/29/15 Migrated type/constant definitions to this file
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-- Seth Henry 10/29/15 Migrated type/constant definitions to this file
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-- Seth Henry 03/09/20 Created new ALU/SP opcodes for handling new RSP
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-- Seth Henry 03/09/20 Created new ALU/SP opcodes for handling new RSP
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-- Seth Henry 03/12/20 Rationalized the naming of the CPU flags to match
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-- Seth Henry 03/12/20 Rationalized the naming of the CPU flags to match
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-- the assembler names. Also removed superfluous
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-- the assembler names. Also removed superfluous
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-- signals in the ALU and PC records.
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-- signals in the ALU and PC records.
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-- Seth Henry 03/17/20 Added new subtype and constants for external
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-- GP flags.
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_arith.all;
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subtype ADDRESS_TYPE is std_logic_vector(OPEN8_ADDR_WIDTH - 1 downto 0);
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subtype ADDRESS_TYPE is std_logic_vector(OPEN8_ADDR_WIDTH - 1 downto 0);
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subtype DATA_TYPE is std_logic_vector(OPEN8_DATA_WIDTH - 1 downto 0);
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subtype DATA_TYPE is std_logic_vector(OPEN8_DATA_WIDTH - 1 downto 0);
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-- Note: INTERRUPT_BUNDLE must be exactly the same width as DATA_TYPE
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-- Note: INTERRUPT_BUNDLE must be exactly the same width as DATA_TYPE
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subtype INTERRUPT_BUNDLE is DATA_TYPE;
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subtype INTERRUPT_BUNDLE is DATA_TYPE;
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subtype EXT_GP_FLAGS is std_logic_vector(3 downto 0);
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constant EXT_GP4 : integer := 0;
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constant EXT_GP5 : integer := 1;
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constant EXT_GP6 : integer := 2;
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constant EXT_GP7 : integer := 3;
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-- Component declaration
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-- Component declaration
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-- (assumes a 1K RAM at 0x0000 and ROM at the top of the memory map)
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-- (assumes a 1K RAM at 0x0000 and ROM at the top of the memory map)
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component o8_cpu is
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component o8_cpu is
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generic(
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generic(
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Program_Start_Addr : ADDRESS_TYPE := x"8000";
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Program_Start_Addr : ADDRESS_TYPE := x"8000";
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Allow_Stack_Address_Move : boolean := false;
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Allow_Stack_Address_Move : boolean := false;
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Stack_Xfer_Flag : integer := 4;
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Stack_Xfer_Flag : integer := 4;
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Enable_Auto_Increment : boolean := false;
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Enable_Auto_Increment : boolean := false;
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BRK_Implements_WAI : boolean := false;
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BRK_Implements_WAI : boolean := false;
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Enable_NMI : boolean := true;
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Enable_NMI : boolean := true;
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RTI_Ignores_GP_Flags : boolean := false;
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Default_Interrupt_Mask : DATA_TYPE := x"FF";
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Default_Interrupt_Mask : DATA_TYPE := x"FF";
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Reset_Level : std_logic := '0' );
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Reset_Level : std_logic := '0' );
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port(
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port(
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Clock : in std_logic;
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Clock : in std_logic;
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Reset : in std_logic;
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Reset : in std_logic;
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CPU_Halt : in std_logic;
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CPU_Halt : in std_logic;
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Interrupts : in INTERRUPT_BUNDLE;
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Interrupts : in INTERRUPT_BUNDLE;
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GP_Flags : out EXT_GP_FLAGS;
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Address : out ADDRESS_TYPE;
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Address : out ADDRESS_TYPE;
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Rd_Data : in DATA_TYPE;
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Rd_Data : in DATA_TYPE;
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Rd_Enable : out std_logic;
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Rd_Enable : out std_logic;
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Wr_Data : out DATA_TYPE;
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Wr_Data : out DATA_TYPE;
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Wr_Enable : out std_logic );
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Wr_Enable : out std_logic );
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