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Line 42... |
entity neorv32_cpu_decompressor is
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entity neorv32_cpu_decompressor is
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port (
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port (
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-- instruction input --
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-- instruction input --
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ci_instr16_i : in std_ulogic_vector(15 downto 0); -- compressed instruction input
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ci_instr16_i : in std_ulogic_vector(15 downto 0); -- compressed instruction input
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-- instruction output --
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-- instruction output --
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ci_valid_o : out std_ulogic; -- is a compressed instruction
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ci_illegal_o : out std_ulogic; -- is an illegal compressed instruction
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ci_illegal_o : out std_ulogic; -- is an illegal compressed instruction
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ci_instr32_o : out std_ulogic_vector(31 downto 0) -- 32-bit decompressed instruction
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ci_instr32_o : out std_ulogic_vector(31 downto 0) -- 32-bit decompressed instruction
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);
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);
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end neorv32_cpu_decompressor;
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end neorv32_cpu_decompressor;
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ci_instr32_o(22) <= ci_instr16_i(6);
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ci_instr32_o(22) <= ci_instr16_i(6);
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ci_instr32_o(23) <= ci_instr16_i(10);
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ci_instr32_o(23) <= ci_instr16_i(10);
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ci_instr32_o(24) <= ci_instr16_i(11);
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ci_instr32_o(24) <= ci_instr16_i(11);
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ci_instr32_o(25) <= ci_instr16_i(12);
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ci_instr32_o(25) <= ci_instr16_i(12);
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ci_instr32_o(26) <= ci_instr16_i(5);
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ci_instr32_o(26) <= ci_instr16_i(5);
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ci_instr32_o(31 downto 26) <= (others => '0');
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ci_instr32_o(31 downto 27) <= (others => '0');
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ci_instr32_o(instr_funct3_msb_c downto instr_funct3_lsb_c) <= funct3_lw_c;
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ci_instr32_o(instr_funct3_msb_c downto instr_funct3_lsb_c) <= funct3_lw_c;
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ci_instr32_o(instr_rs1_msb_c downto instr_rs1_lsb_c) <= "01" & ci_instr16_i(ci_rs1_3_msb_c downto ci_rs1_3_lsb_c); -- x8 - x15
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ci_instr32_o(instr_rs1_msb_c downto instr_rs1_lsb_c) <= "01" & ci_instr16_i(ci_rs1_3_msb_c downto ci_rs1_3_lsb_c); -- x8 - x15
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ci_instr32_o(instr_rd_msb_c downto instr_rd_lsb_c) <= "01" & ci_instr16_i(ci_rd_3_msb_c downto ci_rd_3_lsb_c); -- x8 - x15
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ci_instr32_o(instr_rd_msb_c downto instr_rd_lsb_c) <= "01" & ci_instr16_i(ci_rd_3_msb_c downto ci_rd_3_lsb_c); -- x8 - x15
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when "110" => -- C.SW
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when "110" => -- C.SW
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Line 429... |
NULL;
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NULL;
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end case;
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end case;
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end process decompressor;
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end process decompressor;
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-- is compressed instruction at all? --
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ci_valid_o <= '0' when (ci_instr16_i(ci_opcode_msb_c downto ci_opcode_lsb_c) = "11") else '1';
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end neorv32_cpu_decompressor_rtl;
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end neorv32_cpu_decompressor_rtl;
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