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constant ctrl_rf_rd_adr2_c : natural := 14; -- destiantion register address bit 2
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constant ctrl_rf_rd_adr2_c : natural := 14; -- destiantion register address bit 2
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constant ctrl_rf_rd_adr3_c : natural := 15; -- destiantion register address bit 3
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constant ctrl_rf_rd_adr3_c : natural := 15; -- destiantion register address bit 3
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constant ctrl_rf_rd_adr4_c : natural := 16; -- destiantion register address bit 4
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constant ctrl_rf_rd_adr4_c : natural := 16; -- destiantion register address bit 4
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constant ctrl_rf_wb_en_c : natural := 17; -- write back enable
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constant ctrl_rf_wb_en_c : natural := 17; -- write back enable
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constant ctrl_rf_clear_rs1_c : natural := 18; -- force rs1=r0
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constant ctrl_rf_clear_rs1_c : natural := 18; -- force rs1=r0
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constant ctrl_rf_clear_rs2_c : natural := 19; -- force rs2=r0
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-- alu --
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-- alu --
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constant ctrl_alu_cmd0_c : natural := 20; -- ALU command bit 0
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constant ctrl_alu_cmd0_c : natural := 19; -- ALU command bit 0
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constant ctrl_alu_cmd1_c : natural := 21; -- ALU command bit 1
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constant ctrl_alu_cmd1_c : natural := 20; -- ALU command bit 1
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constant ctrl_alu_cmd2_c : natural := 22; -- ALU command bit 2
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constant ctrl_alu_cmd2_c : natural := 21; -- ALU command bit 2
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constant ctrl_alu_opa_mux_lsb_c : natural := 23; -- operand A select lsb (00=rs1, 01=PC)
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constant ctrl_alu_opa_mux_lsb_c : natural := 22; -- operand A select lsb (00=rs1, 01=PC)
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constant ctrl_alu_opa_mux_msb_c : natural := 24; -- operand A select msb (1-=CSR)
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constant ctrl_alu_opa_mux_msb_c : natural := 23; -- operand A select msb (1-=CSR)
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constant ctrl_alu_opb_mux_lsb_c : natural := 25; -- operand B select lsb (00=rs2, 01=IMM)
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constant ctrl_alu_opb_mux_lsb_c : natural := 24; -- operand B select lsb (00=rs2, 01=IMM)
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constant ctrl_alu_opb_mux_msb_c : natural := 26; -- operand B select msb (1-=rs1)
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constant ctrl_alu_opb_mux_msb_c : natural := 25; -- operand B select msb (1-=rs1)
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constant ctrl_alu_opc_mux_c : natural := 27; -- operand C select (0=IMM, 1=rs2)
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constant ctrl_alu_opc_mux_c : natural := 26; -- operand C select (0=IMM, 1=rs2)
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constant ctrl_alu_unsigned_c : natural := 28; -- is unsigned ALU operation
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constant ctrl_alu_unsigned_c : natural := 27; -- is unsigned ALU operation
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constant ctrl_alu_shift_dir_c : natural := 29; -- shift direction (0=left, 1=right)
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constant ctrl_alu_shift_dir_c : natural := 28; -- shift direction (0=left, 1=right)
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constant ctrl_alu_shift_ar_c : natural := 30; -- is arithmetic shift
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constant ctrl_alu_shift_ar_c : natural := 29; -- is arithmetic shift
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-- bus interface --
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-- bus interface --
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constant ctrl_bus_size_lsb_c : natural := 31; -- transfer size lsb (00=byte, 01=half-word)
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constant ctrl_bus_size_lsb_c : natural := 30; -- transfer size lsb (00=byte, 01=half-word)
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constant ctrl_bus_size_msb_c : natural := 32; -- transfer size msb (10=word, 11=?)
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constant ctrl_bus_size_msb_c : natural := 31; -- transfer size msb (10=word, 11=?)
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constant ctrl_bus_rd_c : natural := 33; -- read data request
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constant ctrl_bus_rd_c : natural := 32; -- read data request
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constant ctrl_bus_wr_c : natural := 34; -- write data request
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constant ctrl_bus_wr_c : natural := 33; -- write data request
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constant ctrl_bus_if_c : natural := 35; -- instruction fetch request
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constant ctrl_bus_if_c : natural := 34; -- instruction fetch request
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constant ctrl_bus_mar_we_c : natural := 36; -- memory address register write enable
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constant ctrl_bus_mar_we_c : natural := 35; -- memory address register write enable
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constant ctrl_bus_mdo_we_c : natural := 37; -- memory data out register write enable
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constant ctrl_bus_mdo_we_c : natural := 36; -- memory data out register write enable
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constant ctrl_bus_mdi_we_c : natural := 38; -- memory data in register write enable
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constant ctrl_bus_mdi_we_c : natural := 37; -- memory data in register write enable
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constant ctrl_bus_unsigned_c : natural := 39; -- is unsigned load
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constant ctrl_bus_unsigned_c : natural := 38; -- is unsigned load
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constant ctrl_bus_ierr_ack_c : natural := 40; -- acknowledge instruction fetch bus exception
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constant ctrl_bus_ierr_ack_c : natural := 39; -- acknowledge instruction fetch bus exception
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constant ctrl_bus_derr_ack_c : natural := 41; -- acknowledge data access bus exception
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constant ctrl_bus_derr_ack_c : natural := 40; -- acknowledge data access bus exception
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constant ctrl_bus_fence_c : natural := 42; -- executed fence operation
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constant ctrl_bus_fence_c : natural := 41; -- executed fence operation
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constant ctrl_bus_fencei_c : natural := 43; -- executed fencei operation
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constant ctrl_bus_fencei_c : natural := 42; -- executed fencei operation
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-- co-processor --
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-- co-processor --
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constant ctrl_cp_use_c : natural := 44; -- is cp operation
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constant ctrl_cp_use_c : natural := 43; -- is cp operation
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constant ctrl_cp_id_lsb_c : natural := 45; -- cp select lsb
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constant ctrl_cp_id_lsb_c : natural := 44; -- cp select lsb
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constant ctrl_cp_id_msb_c : natural := 46; -- cp select msb
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constant ctrl_cp_id_msb_c : natural := 45; -- cp select msb
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constant ctrl_cp_cmd0_c : natural := 47; -- cp command bit 0
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constant ctrl_cp_cmd0_c : natural := 46; -- cp command bit 0
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constant ctrl_cp_cmd1_c : natural := 48; -- cp command bit 1
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constant ctrl_cp_cmd1_c : natural := 47; -- cp command bit 1
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constant ctrl_cp_cmd2_c : natural := 49; -- cp command bit 2
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constant ctrl_cp_cmd2_c : natural := 48; -- cp command bit 2
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-- control bus size --
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-- control bus size --
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constant ctrl_width_c : natural := 50; -- control bus size
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constant ctrl_width_c : natural := 49; -- control bus size
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-- ALU Comparator Bus ---------------------------------------------------------------------
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-- ALU Comparator Bus ---------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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constant alu_cmp_equal_c : natural := 0;
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constant alu_cmp_equal_c : natural := 0;
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constant alu_cmp_less_c : natural := 1; -- for signed and unsigned comparisons
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constant alu_cmp_less_c : natural := 1; -- for signed and unsigned comparisons
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constant alu_cmd_slt_c : std_ulogic_vector(2 downto 0) := "010"; -- r <= A < B
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constant alu_cmd_slt_c : std_ulogic_vector(2 downto 0) := "010"; -- r <= A < B
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constant alu_cmd_shift_c : std_ulogic_vector(2 downto 0) := "011"; -- r <= A <</>> B
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constant alu_cmd_shift_c : std_ulogic_vector(2 downto 0) := "011"; -- r <= A <</>> B
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constant alu_cmd_xor_c : std_ulogic_vector(2 downto 0) := "100"; -- r <= A xor B
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constant alu_cmd_xor_c : std_ulogic_vector(2 downto 0) := "100"; -- r <= A xor B
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constant alu_cmd_or_c : std_ulogic_vector(2 downto 0) := "101"; -- r <= A or B
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constant alu_cmd_or_c : std_ulogic_vector(2 downto 0) := "101"; -- r <= A or B
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constant alu_cmd_and_c : std_ulogic_vector(2 downto 0) := "110"; -- r <= A and B
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constant alu_cmd_and_c : std_ulogic_vector(2 downto 0) := "110"; -- r <= A and B
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constant alu_cmd_bitm_c : std_ulogic_vector(2 downto 0) := "111"; -- r <= bit manipulation
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constant alu_cmd_bclr_c : std_ulogic_vector(2 downto 0) := "111"; -- r <= A and (not B)
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-- Trap ID Codes --------------------------------------------------------------------------
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-- Trap ID Codes --------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- risc-v compliant --
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-- risc-v compliant --
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constant trap_ima_c : std_ulogic_vector(5 downto 0) := "000000"; -- 0.0: instruction misaligned
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constant trap_ima_c : std_ulogic_vector(5 downto 0) := "000000"; -- 0.0: instruction misaligned
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-- data output --
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-- data output --
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cmp_o : out std_ulogic_vector(1 downto 0); -- comparator status
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cmp_o : out std_ulogic_vector(1 downto 0); -- comparator status
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add_o : out std_ulogic_vector(data_width_c-1 downto 0); -- OPA + OPB
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add_o : out std_ulogic_vector(data_width_c-1 downto 0); -- OPA + OPB
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res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- ALU result
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res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- ALU result
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-- co-processor interface --
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-- co-processor interface --
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cp_opa_o : out std_ulogic_vector(data_width_c-1 downto 0); -- co-processor operand a
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cp_opb_o : out std_ulogic_vector(data_width_c-1 downto 0); -- co-processor operand b
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cp0_start_o : out std_ulogic; -- trigger co-processor 0
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cp0_start_o : out std_ulogic; -- trigger co-processor 0
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cp0_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 0 result
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cp0_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 0 result
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cp0_valid_i : in std_ulogic; -- co-processor 0 result valid
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cp0_valid_i : in std_ulogic; -- co-processor 0 result valid
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cp1_start_o : out std_ulogic; -- trigger co-processor 1
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cp1_start_o : out std_ulogic; -- trigger co-processor 1
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cp1_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 1 result
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cp1_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 1 result
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