| Line 48... |
Line 48... |
subtype t_memory_type is std_logic_vector(7 downto 5);
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subtype t_memory_type is std_logic_vector(7 downto 5);
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-- These are all the types the cache knows about
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-- These are all the types the cache knows about
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constant MT_BRAM : t_memory_type := "000";
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constant MT_BRAM : t_memory_type := "000";
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constant MT_IO_SYNC : t_memory_type := "001";
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constant MT_IO_SYNC : t_memory_type := "001";
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constant MT_SRAM_16B : t_memory_type := "010";
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constant MT_SRAM_16B : t_memory_type := "010";
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constant MT_FLASH_16B : t_memory_type := "011";
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constant MT_SRAM_8B : t_memory_type := "011";
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constant MT_DDR_16B : t_memory_type := "100";
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constant MT_DDR_16B : t_memory_type := "100";
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constant MT_UNMAPPED : t_memory_type := "111";
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constant MT_UNMAPPED : t_memory_type := "111";
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-- Wait state counter -- we're supporting static memory from 10 to >100 ns
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-- Wait state counter -- we're supporting static memory from 10 to >100 ns
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subtype t_wait_state_count is std_logic_vector(2 downto 0);
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subtype t_wait_state_count is std_logic_vector(2 downto 0);
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| Line 142... |
Line 142... |
when others => return (MT_UNMAPPED ,'0','0',"000"); -- stray
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when others => return (MT_UNMAPPED ,'0','0',"000"); -- stray
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end case;
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end case;
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end function decode_addr_plasma;
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end function decode_addr_plasma;
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-- Address decoding for MIPS-I-like system
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-- Address decoding for MIPS-I-like system as implemented in target hardware
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function decode_addr_mips1(addr : t_addr_decode) return t_range_attr is
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function decode_addr_mips1(addr : t_addr_decode) return t_range_attr is
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begin
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begin
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case addr(31 downto 27) is
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case addr(31 downto 27) is
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when "00000" => return (MT_SRAM_16B ,'1','1',"011"); -- useg
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when "00000" => return (MT_SRAM_16B ,'1','1',"000"); -- useg
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when "10000" => return (MT_SRAM_16B ,'1','1',"000"); -- kseg0
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when "10000" => return (MT_SRAM_16B ,'1','1',"000"); -- kseg0
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--when "10100" => return (MT_IO_SYNC ,'1','0',"000"); -- kseg1 i/o
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--when "10100" => return (MT_IO_SYNC ,'1','0',"000"); -- kseg1 i/o
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when "00100" => return (MT_IO_SYNC ,'1','0',"000"); -- kseg1 i/o
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when "00100" => return (MT_IO_SYNC ,'1','0',"000"); -- kseg1 i/o
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when "10110" => return (MT_FLASH_16B,'0','0',"011"); -- kseg1 flash
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when "10110" => return (MT_SRAM_8B ,'0','0',"011"); -- kseg1 flash
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when "10111" => return (MT_BRAM ,'0','0',"000"); -- kseg1 boot rom
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when "10111" => return (MT_BRAM ,'0','0',"000"); -- kseg1 boot rom
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when others => return (MT_UNMAPPED ,'0','0',"000"); -- stray
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when others => return (MT_UNMAPPED ,'0','0',"000"); -- stray
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end case;
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end case;
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end function decode_addr_mips1;
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end function decode_addr_mips1;
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