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[/] [open8_urisc/] [trunk/] [VHDL/] [Open8_cfg.vhd] - Rev 309
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-- VHDL Units : Open8_cfg -- Description: Contains an example Open8_cfg file -- -- Revision History -- Author Date Change ------------------ -------- --------------------------------------------------- -- Seth Henry 10/21/20 Design Start library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; library work; use work.open8_pkg.all; package open8_cfg is -- Internal Clock Frequency constant Clock_Frequency : real := 120000000.0; -- Open8 CPU Options constant Allow_Stack_Address_Move : boolean := TRUE; constant Enable_Auto_Increment : boolean := TRUE; constant BRK_Implements_WAI : boolean := TRUE; constant Enable_NMI : boolean := TRUE; constant Sequential_Interrupts : boolean := TRUE; constant RTI_Ignores_GP_Flags : boolean := TRUE; constant Supervisor_Mode : boolean := TRUE; constant Unsigned_Index_Offsets : boolean := TRUE; constant Rotate_Ignores_Carry : boolean := TRUE; constant Default_Int_Mask : DATA_TYPE := x"00"; -- System Memory Map constant RAM_Address : ADDRESS_TYPE := x"0000"; -- System RAM constant WPR_Address : ADDRESS_TYPE := x"1000"; -- Write Protect Mask constant WQL_Address : ADDRESS_TYPE := x"1100"; -- Write Qual Register constant INT_Address : ADDRESS_TYPE := x"1200"; -- Interrupt Manager constant ROM_Address : ADDRESS_TYPE := x"8000"; -- Application ROM constant ISR_Start_Addr : ADDRESS_TYPE := x"FFF0"; -- ISR vector table -- RAM size is used to calculate the initial stack pointer, which is set at -- the top of the RAM region. constant RAM_Size : integer := 4096; constant RAM_Write_Protect : boolean := TRUE; -- CPU Interrupt assignments - Note that interrupt 0 is the NMI (non-maskable) -- also, because these are handled by the CPU, they are in priority order -- from 0 (highest) to 7 (lowest). constant CPU_INT_RAM : integer range 0 to OPEN8_DATA_WIDTH - 1 := 0; constant CPU_INT_PIT : integer range 0 to OPEN8_DATA_WIDTH - 1 := 1; constant CPU_INT_EXT : integer range 0 to OPEN8_DATA_WIDTH - 1 := 2; -- I/O Interrupt assignments (Not technically required, as software will overwrite -- this during initialization) constant Default_IO_Int_Mask : ADDRESS_TYPE := x"0000"; -- Set this to the number of readable modules in the design, as it sets the -- number of ports on the read aggregator function. constant NUM_READ_BUSES : integer := 4; -- Read Data Bus aggregator and bus assignments. -- Note that the ordering isn't important, only that each device has a -- unique number less than NUM_READ_BUSES. constant RDB_RAM : integer range 0 to NUM_READ_BUSES - 1 := 0; constant RDB_WQL : integer range 0 to NUM_READ_BUSES - 1 := 1; constant RDB_INT : integer range 0 to NUM_READ_BUSES - 1 := 2; constant RDB_ROM : integer range 0 to NUM_READ_BUSES - 1 := 3; -- System configuration calculations - no adjustable parameters below this point type OPEN8_BUS_ARRAY is array(0 to NUM_READ_BUSES - 1) of DATA_TYPE; constant INIT_READ_BUS : OPEN8_BUS_ARRAY := (others => OPEN8_NULLBUS); function merge_buses (x : in OPEN8_BUS_ARRAY) return DATA_TYPE; -- Compute the stack start address based on the RAM size constant RAM_Vector_Size : integer := ceil_log2(RAM_Size - 1); constant RAM_End_Addr : std_logic_vector(RAM_Vector_Size - 1 downto 0) := (others => '1'); constant Stack_Start_Addr : ADDRESS_TYPE := RAM_Address + RAM_End_Addr; end package; package body open8_cfg is function merge_buses (x : in OPEN8_BUS_ARRAY) return DATA_TYPE is variable i : integer := 0; variable retval : DATA_TYPE := x"00"; begin retval := x"00"; for i in 0 to NUM_READ_BUSES - 1 loop retval := retval or x(i); end loop; return retval; end function; end package body;
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