cpu/src/core_top.vhd

   1 library IEEE;
   2 use IEEE.std_logic_1164.all;
   3 use IEEE.numeric_std.all;
   4
   5 use work.common_pkg.all;
   6 use work.core_pkg.all;
   7 use work.extension_pkg.all;
   8
   9 entity core_top is
  10
  11         port(
  12                 --System input pins
  13                    sys_res : in std_logic;
  14                         soft_res : in std_logic;
  15                         sys_clk : in std_logic;
  16 --                      result : out gp_register_t;
  17 --                      reg_wr_data : out gp_register_t
  18                   -- uart
  19                         bus_tx : out std_logic;
  20                         bus_rx : in std_logic;
  21                         led2 : out std_logic;
  22
  23                         sseg0 : out std_logic_vector(0 to 6);
  24                         sseg1 : out std_logic_vector(0 to 6);
  25                         sseg2 : out std_logic_vector(0 to 6);
  26                         sseg3 : out std_logic_vector(0 to 6)
  27                 );
  28
  29 end core_top;
  30
  31 architecture behav of core_top is
  32
  33                 constant SYNC_STAGES : integer := 2;
  34                 constant RESET_VALUE : std_logic := '0';
  35
  36                 signal jump_result : instruction_addr_t;
  37                 signal jump_result_pin : instruction_addr_t;
  38                 signal prediction_result_pin : instruction_addr_t;
  39                 signal branch_prediction_bit_pin : std_logic;
  40                 signal alu_jump_bit_pin : std_logic;
  41                 signal instruction_pin : instruction_word_t;
  42                 signal prog_cnt_pin : instruction_addr_t;
  43
  44                 signal reg_w_addr_pin : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
  45                 signal reg_wr_data_pin : gp_register_t;
  46                 signal reg_we_pin : std_logic;
  47                 signal to_next_stage : dec_op;
  48
  49 --              signal reg1_rd_data_pin : gp_register_t;
  50 --              signal reg2_rd_data_pin : gp_register_t;
  51
  52                  signal result_pin : gp_register_t;--reg
  53                  signal result_addr_pin : gp_addr_t;--reg
  54                  signal addr_pin : word_t; --memaddr
  55                  signal data_pin : gp_register_t; --mem data --ureg
  56                  signal alu_jump_pin : std_logic;--reg
  57                  signal brpr_pin  : std_logic;  --reg
  58                  signal wr_en_pin : std_logic;--regop --reg
  59                  signal dmem_pin  : std_logic;--memop
  60                  signal dmem_wr_en_pin : std_logic;
  61                  signal hword_pin  : std_logic;
  62                  signal byte_s_pin : std_logic;
  63
  64                  signal gpm_in_pin : extmod_rec;
  65                  signal gpm_out_pin : gp_register_t;
  66                  signal nop_pin : std_logic;
  67
  68                  signal sync, sync2 : std_logic_vector(1 to SYNC_STAGES);
  69                  signal sys_res_n, soft_res_n : std_logic;
  70
  71                  signal int_req : interrupt_t;
  72
  73                  signal new_im_data : std_logic;
  74                  signal im_addr, im_data : gp_register_t;
  75
  76                  signal vers, vers_nxt : exec2wb_rec;
  77 begin
  78
  79         fetch_st : fetch_stage
  80                 generic map (
  81
  82                         '0',
  83                         '1'
  84                 )
  85
  86                 port map (
  87                 --System inputs
  88                         clk => sys_clk, --: in std_logic;
  89                         reset => sys_res_n, --: in std_logic;
  90                         s_reset => soft_res_n,
  91                 --Data inputs
  92                         jump_result => jump_result_pin, --: in instruction_addr_t;
  93                         prediction_result => prediction_result_pin, --: in instruction_addr_t;
  94                         branch_prediction_bit => branch_prediction_bit_pin,  --: in std_logic;
  95                         alu_jump_bit => alu_jump_bit_pin, --: in std_logic;
  96                         int_req => int_req,
  97                 -- instruction memory program port :D
  98                         new_im_data_in => new_im_data,
  99                         im_addr => im_addr,
 100                         im_data => im_data,
 101                 --Data outputs
 102                         instruction => instruction_pin, --: out instruction_word_t
 103                         prog_cnt => prog_cnt_pin,
 104                         led2 => led2
 105                 );
 106
 107         decode_st : decode_stage
 108                 generic map (
 109                         -- active reset value
 110                         '0',
 111                         -- active logic value
 112                         '1'
 113
 114                         )
 115                 port map (
 116                 --System inputs
 117                         clk => sys_clk, --: in std_logic;
 118                         reset => sys_res_n and soft_res_n, -- : in std_logic;
 119
 120                 --Data inputs
 121                         instruction => instruction_pin, --: in instruction_word_t;
 122                         prog_cnt => prog_cnt_pin,
 123                         reg_w_addr => reg_w_addr_pin, --: in std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
 124                         reg_wr_data => reg_wr_data_pin, --: in gp_register_t;
 125                         reg_we => reg_we_pin, --: in std_logic;
 126                         nop => nop_pin,
 127
 128                 --Data outputs
 129                         branch_prediction_res => prediction_result_pin, --: instruction_word_t;
 130                         branch_prediction_bit => branch_prediction_bit_pin, --: std_logic
 131                         to_next_stage => to_next_stage
 132                 );
 133
 134           exec_st : execute_stage
 135                 generic map('0')
 136                 port map(sys_clk, sys_res_n and soft_res_n, to_next_stage, reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, gpm_in_pin, result_pin, result_addr_pin,addr_pin,
 137                 data_pin, alu_jump_pin,brpr_pin, wr_en_pin, dmem_pin,dmem_wr_en_pin,hword_pin,byte_s_pin, gpm_out_pin);
 138
 139
 140                         vers_nxt.result <= result_pin;
 141                         vers_nxt.result_addr <= result_addr_pin;
 142                         vers_nxt.address <= addr_pin;
 143                         vers_nxt.ram_data <= data_pin;
 144                         vers_nxt.alu_jmp <= alu_jump_pin;
 145                         vers_nxt.br_pred <= brpr_pin;
 146                         vers_nxt.write_en <= wr_en_pin;
 147                         vers_nxt.dmem_en <= dmem_pin;
 148                         vers_nxt.dmem_write_en <= dmem_wr_en_pin;
 149                         vers_nxt.hword <= hword_pin;
 150                         vers_nxt.byte_s <= byte_s_pin;
 151
 152 --          writeback_st : writeback_stage
 153 --                generic map('0', '1')
 154 --                port map(sys_clk, sys_res, result_pin, result_addr_pin, addr_pin, data_pin, alu_jump_pin, brpr_pin,
 155 --                wr_en_pin, dmem_pin, dmem_wr_en_pin, hword_pin, byte_s_pin,
 156 --                reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, jump_result_pin, alu_jump_bit_pin,bus_tx, sseg0, sseg1, sseg2, sseg3);
 157 --
 158
 159                         writeback_st : writeback_stage
 160                 generic map('0', '1', "altera", 2083)
 161                 port map(sys_clk, sys_res_n and soft_res_n, vers_nxt.result, vers_nxt.result_addr, vers_nxt.address, vers_nxt.ram_data, vers_nxt.alu_jmp, vers_nxt.br_pred,
 162                 vers_nxt.write_en, vers_nxt.dmem_en, vers_nxt.dmem_write_en, vers_nxt.hword, vers_nxt.byte_s,
 163                 reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, jump_result_pin, alu_jump_bit_pin,bus_tx, bus_rx,
 164                                 -- instruction memory program port :D
 165                                 new_im_data, im_addr, im_data,
 166                                 sseg0, sseg1, sseg2, sseg3, int_req);
 167
 168
 169 syn: process(sys_clk, sys_res, soft_res)
 170
 171 begin
 172
 173         if sys_res = '1' then
 174 --                      vers.result <= (others => '0');
 175 --                      vers.result_addr <= (others => '0');
 176 --                      vers.address <= (others => '0');
 177 --                      vers.ram_data <= (others => '0');
 178 --                      vers.alu_jmp <= '0';
 179 --                      vers.br_pred <= '0';
 180 --                      vers.write_en <= '0';
 181 --                      vers.dmem_en <= '0';
 182 --                      vers.dmem_write_en <= '0';
 183 --                      vers.hword <= '0';
 184 --                      vers.byte_s <= '0';
 185
 186                 sync <= (others => '0');
 187                 sync2 <= (others => '0');
 188
 189         elsif rising_edge(sys_clk) then
 190 --              vers <= vers_nxt;
 191                         sync(1) <= not sys_res;
 192                         for i in 2 to SYNC_STAGES loop
 193                                 sync(i) <= sync(i - 1);
 194                         end loop;
 195                         sync2(1) <= not soft_res;
 196                         for i in 2 to SYNC_STAGES loop
 197                                 sync2(i) <= sync2(i - 1);
 198                         end loop;
 199         end if;
 200
 201
 202 end process;
 203
 204 sys_res_n <= sync(SYNC_STAGES);
 205 soft_res_n <= sync2(SYNC_STAGES);
 206
 207 --init : process(all)
 208
 209 --begin
 210 --      jump_result_pin <= (others => '0');
 211 --      alu_jump_bit_pin <= '0';
 212 --      reg_w_addr_pin <= (others => '0');
 213 --      reg_wr_data_pin <= (others => '0');
 214 --      reg_we_pin <= '0';
 215
 216 --end process;
 217
 218 --      result <= result_pin;
 219         nop_pin <= (alu_jump_bit_pin); -- xor brpr_pin);
 220
 221         jump_result <= prog_cnt_pin; --jump_result_pin;
 222 --      sys_res <= '1';
 223
 224 --      reg_wr_data <= reg_wr_data_pin;
 225
 226 end behav;