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use ieee.std_logic_arith.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_unsigned.all;
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package mips_pkg is
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package mips_pkg is
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-- FIXME this stuff belongs in the cache module where address decoding is made
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subtype t_addr_decode is std_logic_vector(31 downto 16);
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-- (besides, they should be module generics, not package constants)
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constant ADDR_BOOT : t_addr_decode := X"0000";
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subtype t_addr_decode is std_logic_vector(31 downto 24);
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constant ADDR_XRAM : t_addr_decode := X"8000";
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constant ADDR_BOOT : t_addr_decode := X"00";
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constant ADDR_IO : t_addr_decode := X"2000";
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constant ADDR_XRAM : t_addr_decode := X"80";
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constant ADDR_IO : t_addr_decode := X"20";
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subtype t_addr is std_logic_vector(31 downto 0);
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subtype t_addr is std_logic_vector(31 downto 0);
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subtype t_word is std_logic_vector(31 downto 0);
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subtype t_word is std_logic_vector(31 downto 0);
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subtype t_dword is std_logic_vector(63 downto 0);
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subtype t_dword is std_logic_vector(63 downto 0);
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-- Computes ceil(log2(A)), e.g. address width of memory block
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-- Computes ceil(log2(A)), e.g. address width of memory block
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-- CAN BE USED IN SYNTHESIZABLE CODE as long as called with constant arguments
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-- CAN BE USED IN SYNTHESIZABLE CODE as long as called with constant arguments
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function log2(A : natural) return natural;
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function log2(A : natural) return natural;
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-- Return '1' if address A is within a given memory area
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-- CAN BE USED IN SYNTHESIZABLE CODE as long as called with constant arguments
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function addr_decode(A : std_logic_vector; mask : t_addr_decode) return std_logic;
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end package;
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end package;
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package body mips_pkg is
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package body mips_pkg is
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end if;
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end if;
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end loop;
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end loop;
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return(30);
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return(30);
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end function log2;
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end function log2;
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function addr_decode(A : std_logic_vector; mask : t_addr_decode) return std_logic is
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begin
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if A(mask'high downto mask'low) = mask then
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return '1';
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else
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return '0';
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end if;
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end function addr_decode;
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end package body;
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end package body;
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