Subversion Repositories mblite

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--

--      Input file         : core_Pkg.vhd

--      Design name        : core_Pkg

--      Author             : Tamar Kranenburg

--      Company            : Delft University of Technology

--                         : Faculty EEMCS, Department ME&CE

--                         : Systems and Circuits group

--

--      Description        : Package with components and type definitions for the interface

--                           of the components

--

--

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LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

USE ieee.std_logic_unsigned.ALL;

LIBRARY mblite;

USE mblite.config_Pkg.ALL;

USE mblite.std_Pkg.ALL;

PACKAGE core_Pkg IS

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-- TYPES USED IN MB-LITE

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    TYPE alu_operation     IS (ALU_ADD, ALU_OR, ALU_AND, ALU_XOR, ALU_SHIFT, ALU_SEXT8, ALU_SEXT16, ALU_MUL, ALU_BS);

    TYPE src_type_a        IS (ALU_SRC_REGA, ALU_SRC_NOT_REGA, ALU_SRC_PC, ALU_SRC_ZERO);

    TYPE src_type_b        IS (ALU_SRC_REGB, ALU_SRC_NOT_REGB, ALU_SRC_IMM, ALU_SRC_NOT_IMM);

    TYPE carry_type        IS (CARRY_ZERO, CARRY_ONE, CARRY_ALU, CARRY_ARITH);

    TYPE carry_keep_type   IS (CARRY_NOT_KEEP, CARRY_KEEP);

    TYPE branch_condition  IS (NOP, BNC, BEQ, BNE, BLT, BLE, BGT, BGE);

    TYPE transfer_size     IS (WORD, HALFWORD, BYTE);

    TYPE ctrl_execution IS RECORD

        alu_op      : alu_operation;

        alu_src_a   : src_type_a;

        alu_src_b   : src_type_b;

        operation   : std_ulogic;

        carry       : carry_type;

        carry_keep  : carry_keep_type;

        branch_cond : branch_condition;

        delay       : std_ulogic;

    END RECORD;

    TYPE ctrl_memory IS RECORD

        mem_write     : std_ulogic;

        mem_read      : std_ulogic;

        transfer_size : transfer_size;

    END RECORD;

    TYPE ctrl_memory_writeback_type IS RECORD

        mem_read      : std_ulogic;

        transfer_size : transfer_size;

    END RECORD;

    TYPE forward_type IS RECORD

        reg_d     : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        reg_write : std_ulogic;

    END RECORD;

    TYPE imem_in_type IS RECORD

        dat_i : std_ulogic_vector(CFG_IMEM_WIDTH - 1 DOWNTO 0);

    END RECORD;

    TYPE imem_out_type IS RECORD

        adr_o : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        ena_o : std_ulogic;

    END RECORD;

    TYPE fetch_in_type IS RECORD

        hazard : std_ulogic;

        branch : std_ulogic;

        branch_target : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

    END RECORD;

    TYPE fetch_out_type IS RECORD

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

    END RECORD;

    TYPE gprf_out_type IS RECORD

        dat_a_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        dat_b_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        dat_d_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

    END RECORD;

    TYPE decode_in_type IS RECORD

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        instruction     : std_ulogic_vector(CFG_IMEM_WIDTH - 1 DOWNTO 0);

        ctrl_wb         : forward_type;

        ctrl_mem_wb     : ctrl_memory_writeback_type;

        mem_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        alu_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        interrupt       : std_ulogic;

        flush_id        : std_ulogic;

    END RECORD;

    TYPE decode_out_type IS RECORD

        reg_a           : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        reg_b           : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        imm             : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        hazard          : std_ulogic;

        ctrl_ex         : ctrl_execution;

        ctrl_mem        : ctrl_memory;

        ctrl_wb         : forward_type;

        fwd_dec_result  : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        fwd_dec         : forward_type;

    END RECORD;

    TYPE gprf_in_type IS RECORD

        adr_a_i : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        adr_b_i : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        adr_d_i : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        dat_w_i : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        adr_w_i : std_ulogic_vector(CFG_GPRF_SIZE - 1 DOWNTO 0);

        wre_i   : std_ulogic;

    END RECORD;

    TYPE execute_out_type IS RECORD

        alu_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        dat_d           : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        branch          : std_ulogic;

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        flush_id        : std_ulogic;

        ctrl_mem        : ctrl_memory;

        ctrl_wb         : forward_type;

    END RECORD;

    TYPE execute_in_type IS RECORD

        reg_a           : std_ulogic_vector(CFG_GPRF_SIZE  - 1 DOWNTO 0);

        dat_a           : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        reg_b           : std_ulogic_vector(CFG_GPRF_SIZE  - 1 DOWNTO 0);

        dat_b           : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        dat_d           : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        imm             : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        fwd_dec         : forward_type;

        fwd_dec_result  : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        fwd_mem         : forward_type;

        ctrl_ex         : ctrl_execution;

        ctrl_mem        : ctrl_memory;

        ctrl_wb         : forward_type;

        ctrl_mem_wb     : ctrl_memory_writeback_type;

        mem_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        alu_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

    END RECORD;

    TYPE mem_in_type IS RECORD

        dat_d           : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        alu_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        mem_result      : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        program_counter : std_ulogic_vector(CFG_IMEM_SIZE - 1 DOWNTO 0);

        branch          : std_ulogic;

        ctrl_mem        : ctrl_memory;

        ctrl_wb         : forward_type;

    END RECORD;

    TYPE mem_out_type IS RECORD

        alu_result  : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        ctrl_wb     : forward_type;

        ctrl_mem_wb : ctrl_memory_writeback_type;

    END RECORD;

    TYPE dmem_in_type IS RECORD

        dat_i : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        ena_i : std_ulogic;

    END RECORD;

    TYPE dmem_out_type IS RECORD

        dat_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

        adr_o : std_ulogic_vector(CFG_DMEM_SIZE - 1 DOWNTO 0);

        sel_o : std_ulogic_vector(3 DOWNTO 0);

        we_o  : std_ulogic;

        ena_o : std_ulogic;

    END RECORD;

    TYPE dmem_in_array_type IS ARRAY(NATURAL RANGE <>) OF dmem_in_type;

    TYPE dmem_out_array_type IS ARRAY(NATURAL RANGE <>) OF dmem_out_type;

    -- WB-master inputs from the wb-slaves

    TYPE wb_mst_in_type IS RECORD

        clk_i : std_ulogic;                      -- master clock input

        rst_i : std_ulogic;                      -- synchronous active high reset

        dat_i : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0); -- databus input

        ack_i : std_ulogic;                      -- buscycle acknowledge input

        int_i : std_ulogic;                      -- interrupt request input

    END RECORD;

    -- WB-master outputs to the wb-slaves

    TYPE wb_mst_out_type IS RECORD

        adr_o : std_ulogic_vector(CFG_DMEM_SIZE - 1 DOWNTO 0);  -- address bits

        dat_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0); -- databus output

        we_o  : std_ulogic;                      -- write enable output

        stb_o : std_ulogic;                      -- strobe signals

        sel_o : std_ulogic_vector(3 DOWNTO 0);   -- select output array

        cyc_o : std_ulogic;                      -- valid BUS cycle output

    END RECORD;

    -- WB-slave inputs, from the WB-master

    TYPE wb_slv_in_type IS RECORD

        clk_i : std_ulogic;                     -- master clock input

        rst_i : std_ulogic;                     -- synchronous active high reset

        adr_i : std_ulogic_vector(CFG_DMEM_SIZE - 1 DOWNTO 0); -- address bits

        dat_i : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0); -- Databus input

        we_i  : std_ulogic;                     -- Write enable input

        stb_i : std_ulogic;                     -- strobe signals / core select signal

        sel_i : std_ulogic_vector(3 DOWNTO 0);   -- select output array

        cyc_i : std_ulogic;                     -- valid BUS cycle input

    END RECORD;

    -- WB-slave outputs to the WB-master

    TYPE wb_slv_out_type IS RECORD

        dat_o : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0); -- Databus output

        ack_o : std_ulogic;                     -- Bus cycle acknowledge output

        int_o : std_ulogic;                     -- interrupt request output

    END RECORD;

----------------------------------------------------------------------------------------------

-- COMPONENTS USED IN MB-LITE

----------------------------------------------------------------------------------------------

    COMPONENT core GENERIC

    (

        G_INTERRUPT  : boolean := CFG_INTERRUPT;

        G_USE_HW_MUL : boolean := CFG_USE_HW_MUL;

        G_USE_BARREL : boolean := CFG_USE_BARREL;

        G_DEBUG      : boolean := CFG_DEBUG

    );

    PORT

    (

        imem_o : OUT imem_out_type;

        dmem_o : OUT dmem_out_type;

        imem_i : IN imem_in_type;

        dmem_i : IN dmem_in_type;

        int_i  : IN std_ulogic;

        rst_i  : IN std_ulogic;

        clk_i  : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT core_wb GENERIC

    (

        G_INTERRUPT  : boolean := CFG_INTERRUPT;

        G_USE_HW_MUL : boolean := CFG_USE_HW_MUL;

        G_USE_BARREL : boolean := CFG_USE_BARREL;

        G_DEBUG      : boolean := CFG_DEBUG

    );

    PORT

    (

        imem_o : OUT imem_out_type;

        wb_o   : OUT wb_mst_out_type;

        imem_i : IN imem_in_type;

        wb_i   : IN wb_mst_in_type

    );

    END COMPONENT;

    COMPONENT core_wb_adapter PORT

    (

        dmem_i : OUT dmem_in_type;

        wb_o   : OUT wb_mst_out_type;

        dmem_o : IN dmem_out_type;

        wb_i   : IN wb_mst_in_type

    );

    END COMPONENT;

    COMPONENT core_wb_async_adapter PORT

    (

        dmem_i : OUT dmem_in_type;

        wb_o   : OUT wb_mst_out_type;

        dmem_o : IN dmem_out_type;

        wb_i   : IN wb_mst_in_type

    );

    END COMPONENT;

    COMPONENT fetch PORT

    (

        fetch_o : OUT fetch_out_type;

        imem_o  : OUT imem_out_type;

        fetch_i : IN fetch_in_type;

        rst_i   : IN std_ulogic;

        ena_i   : IN std_ulogic;

        clk_i   : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT decode GENERIC

    (

        G_INTERRUPT  : boolean := CFG_INTERRUPT;

        G_USE_HW_MUL : boolean := CFG_USE_HW_MUL;

        G_USE_BARREL : boolean := CFG_USE_BARREL;

        G_DEBUG      : boolean := CFG_DEBUG

    );

    PORT

    (

        decode_o : OUT decode_out_type;

        gprf_o   : OUT gprf_out_type;

        decode_i : IN decode_in_type;

        ena_i    : IN std_ulogic;

        rst_i    : IN std_ulogic;

        clk_i    : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT gprf PORT

    (

        gprf_o : OUT gprf_out_type;

        gprf_i : IN gprf_in_type;

        ena_i  : IN std_ulogic;

        clk_i  : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT execute GENERIC

    (

        G_USE_HW_MUL : boolean := CFG_USE_HW_MUL;

        G_USE_BARREL : boolean := CFG_USE_BARREL

    );

    PORT

    (

        exec_o : OUT execute_out_type;

        exec_i : IN execute_in_type;

        ena_i  : IN std_ulogic;

        rst_i  : IN std_ulogic;

        clk_i  : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT mem PORT

    (

        mem_o  : OUT mem_out_type;

        dmem_o : OUT dmem_out_type;

        mem_i  : IN mem_in_type;

        ena_i  : IN std_ulogic;

        rst_i  : IN std_ulogic;

        clk_i  : IN std_ulogic

    );

    END COMPONENT;

    COMPONENT core_address_decoder GENERIC

    (

        G_NUM_SLAVES : positive := CFG_NUM_SLAVES

    );

    PORT

    (

        m_dmem_i : OUT dmem_in_type;

        s_dmem_o : OUT dmem_out_array_type;

        m_dmem_o : IN dmem_out_type;

        s_dmem_i : IN dmem_in_array_type;

        clk_i    : IN std_ulogic

    );

    END COMPONENT;

----------------------------------------------------------------------------------------------

-- FUNCTIONS USED IN MB-LITE

----------------------------------------------------------------------------------------------

    FUNCTION select_register_data(reg_dat, reg, wb_dat : std_ulogic_vector; write : std_ulogic) RETURN std_ulogic_vector;

    FUNCTION forward_condition(reg_write : std_ulogic; reg_a, reg_d : std_ulogic_vector) RETURN std_ulogic;

    FUNCTION align_mem_load(data : std_ulogic_vector; size : transfer_size; address : std_ulogic_vector) RETURN std_ulogic_vector;

    FUNCTION align_mem_store(data : std_ulogic_vector; size : transfer_size) RETURN std_ulogic_vector;

    FUNCTION decode_mem_store(address : std_ulogic_vector(1 DOWNTO 0); size : transfer_size) RETURN std_ulogic_vector;

END core_Pkg;

PACKAGE BODY core_Pkg IS

    -- This function select the register value:

    --      A) zero

    --      B) bypass value read from register file

    --      C) value from register file

    FUNCTION select_register_data(reg_dat, reg, wb_dat : std_ulogic_vector; write : std_ulogic) RETURN std_ulogic_vector IS

        VARIABLE tmp : std_ulogic_vector(CFG_DMEM_WIDTH - 1 DOWNTO 0);

    BEGIN

        IF CFG_REG_FORCE_ZERO = true AND is_zero(reg) = '1' THEN

            tmp := (OTHERS => '0');

        ELSIF CFG_REG_FWD_WB = true AND write = '1' THEN

            tmp := wb_dat;

        ELSE

            tmp := reg_dat;

        END IF;

        RETURN tmp;

    END select_register_data;

    -- This function checks if a forwarding condition is met. The condition is met of register A and D match

    -- and the signal needs to be written back to the register file.

    FUNCTION forward_condition(reg_write : std_ulogic; reg_a, reg_d : std_ulogic_vector ) RETURN std_ulogic IS

    BEGIN

        RETURN reg_write AND compare(reg_a, reg_d);

    END forward_condition;

    -- This function aligns the memory load operation. The load byte-order is defined here.

    FUNCTION align_mem_load(data : std_ulogic_vector; size : transfer_size; address : std_ulogic_vector ) RETURN std_ulogic_vector IS

    BEGIN

        IF CFG_BYTE_ORDER = false THEN

            -- Little endian decoding

            CASE size IS

                WHEN byte =>

                    CASE address(1 DOWNTO 0) IS

                        WHEN "00"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH/4 - 1 DOWNTO 0);

                        WHEN "01"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH/2 - 1 DOWNTO CFG_DMEM_WIDTH/4);

                        WHEN "10"   => RETURN "000000000000000000000000" & data(3*CFG_DMEM_WIDTH/4 - 1 DOWNTO CFG_DMEM_WIDTH/2);

                        WHEN "11"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH - 1 DOWNTO 3*CFG_DMEM_WIDTH/4);

                        WHEN OTHERS => RETURN "00000000000000000000000000000000";

                    END CASE;

                WHEN halfword =>

                    CASE address(1 DOWNTO 0) IS

                        WHEN "00"   => RETURN "0000000000000000" & data(CFG_DMEM_WIDTH/2 - 1 DOWNTO 0);

                        WHEN "10"   => RETURN "0000000000000000" & data(CFG_DMEM_WIDTH - 1 DOWNTO CFG_DMEM_WIDTH/2);

                        WHEN OTHERS => RETURN "00000000000000000000000000000000";

                    END CASE;

                WHEN OTHERS =>

                    RETURN data;

            END CASE;

        ELSE

            -- Big endian decoding

            CASE size IS

                WHEN byte =>

                    CASE address(1 DOWNTO 0) IS

                        WHEN "00"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH - 1 DOWNTO 3*CFG_DMEM_WIDTH/4);

                        WHEN "01"   => RETURN "000000000000000000000000" & data(3*CFG_DMEM_WIDTH/4 - 1 DOWNTO CFG_DMEM_WIDTH/2);

                        WHEN "10"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH/2 - 1 DOWNTO CFG_DMEM_WIDTH/4);

                        WHEN "11"   => RETURN "000000000000000000000000" & data(CFG_DMEM_WIDTH/4 - 1 DOWNTO 0);

                        WHEN OTHERS => RETURN "00000000000000000000000000000000";

                    END CASE;

                WHEN halfword =>

                    CASE address(1 DOWNTO 0) IS

                        WHEN "00"   => RETURN "0000000000000000" & data(CFG_DMEM_WIDTH - 1 DOWNTO CFG_DMEM_WIDTH/2);

                        WHEN "10"   => RETURN "0000000000000000" & data(CFG_DMEM_WIDTH/2 - 1 DOWNTO 0);

                        WHEN OTHERS => RETURN "00000000000000000000000000000000";

                    END CASE;

                WHEN OTHERS =>

                    RETURN data;

            END CASE;

        END IF;

    END align_mem_load;

    -- This function repeats the operand to all positions memory store operation.

    FUNCTION align_mem_store(data : std_ulogic_vector; size : transfer_size) RETURN std_ulogic_vector IS

    BEGIN

        CASE size IS

            WHEN byte     => RETURN data( 7 DOWNTO 0) & data( 7 DOWNTO 0) & data(7 DOWNTO 0) & data(7 DOWNTO 0);

            WHEN halfword => RETURN data(15 DOWNTO 0) & data(15 DOWNTO 0);

            WHEN OTHERS   => RETURN data;

        END CASE;

    END align_mem_store;

    -- This function selects the correct bytes for memory writes. The store byte-order (MSB / LSB) can be defined here.

    FUNCTION decode_mem_store(address : std_ulogic_vector(1 DOWNTO 0); size : transfer_size) RETURN std_ulogic_vector IS

    BEGIN

        IF CFG_BYTE_ORDER = false THEN

            -- Little endian encoding

            CASE size IS

                WHEN BYTE =>

                    CASE address IS

                        WHEN "00"   => RETURN "0001";

                        WHEN "01"   => RETURN "0010";

                        WHEN "10"   => RETURN "0100";

                        WHEN "11"   => RETURN "1000";

                        WHEN OTHERS => RETURN "0000";

                    END CASE;

                WHEN HALFWORD =>

                    CASE address IS

                        WHEN "00"   => RETURN "0011";

                        WHEN "10"   => RETURN "1100";

                        WHEN OTHERS => RETURN "0000";

                    END CASE;

                WHEN OTHERS =>

                    RETURN "1111";

            END CASE;

        ELSE

            -- Big endian encoding

            CASE size IS

                WHEN BYTE =>

                    CASE address IS

                        WHEN "00"   => RETURN "1000";

                        WHEN "01"   => RETURN "0100";

                        WHEN "10"   => RETURN "0010";

                        WHEN "11"   => RETURN "0001";

                        WHEN OTHERS => RETURN "0000";

                    END CASE;

                WHEN HALFWORD =>

                    CASE address IS

                        -- Big endian encoding

                        WHEN "10"   => RETURN "0011";

                        WHEN "00"   => RETURN "1100";

                        WHEN OTHERS => RETURN "0000";

                    END CASE;

                WHEN OTHERS =>

                    RETURN "1111";

            END CASE;

        END IF;

    END decode_mem_store;

END core_Pkg;