2 use IEEE.std_logic_1164.all;
3 use IEEE.numeric_std.all;
5 use work.common_pkg.all;
7 use work.extension_pkg.all;
9 entity core_top_c4de2_115 is
13 CLOCK_50 : in std_logic;
15 KEY : in std_logic_vector(0 to 3);
18 UART_TXD : out std_logic;
19 UART_RXD : in std_logic;
21 LEDR : out std_logic_vector(0 to 17);
22 LEDG : out std_logic_vector(0 to 8);
24 HEX0 : out std_logic_vector(0 to 6);
25 HEX1 : out std_logic_vector(0 to 6);
26 HEX2 : out std_logic_vector(0 to 6);
27 HEX3 : out std_logic_vector(0 to 6);
30 LCD_DATA_8 : out std_logic_vector(7 downto 0);
31 LCD_BLON : out std_logic;
32 LCD_RW : out std_logic;
33 LCD_EN : out std_logic;
34 LCD_RS : out std_logic;
35 LCD_ON : out std_logic
40 end core_top_c4de2_115;
42 architecture behav of core_top_c4de2_115 is
44 constant SYNC_STAGES : integer := 2;
45 constant RESET_VALUE : std_logic := '0';
47 signal sys_clk, sys_res, soft_res : std_logic;
48 signal bus_tx, bus_rx : std_logic;
49 signal led2 : std_logic;
50 signal sseg0, sseg1, sseg2, sseg3 : std_logic_vector(0 to 6);
52 signal jump_result : instruction_addr_t;
53 signal jump_result_pin : instruction_addr_t;
54 signal prediction_result_pin : instruction_addr_t;
55 signal branch_prediction_bit_pin : std_logic;
56 signal alu_jump_bit_pin : std_logic;
57 signal instruction_pin : instruction_word_t;
58 signal prog_cnt_pin : instruction_addr_t;
60 signal reg_w_addr_pin : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
61 signal reg_wr_data_pin : gp_register_t;
62 signal reg_we_pin : std_logic;
63 signal to_next_stage : dec_op;
65 signal result_pin : gp_register_t;--reg
66 signal result_addr_pin : gp_addr_t;--reg
67 signal addr_pin : word_t; --memaddr
68 signal data_pin : gp_register_t; --mem data --ureg
69 signal alu_jump_pin : std_logic;--reg
70 signal brpr_pin : std_logic; --reg
71 signal wr_en_pin : std_logic;--regop --reg
72 signal dmem_pin : std_logic;--memop
73 signal dmem_wr_en_pin : std_logic;
74 signal hword_pin : std_logic;
75 signal byte_s_pin : std_logic;
77 signal gpm_in_pin : extmod_rec;
78 signal gpm_out_pin : gp_register_t;
79 signal nop_pin : std_logic;
81 signal sync : std_logic_vector(1 to SYNC_STAGES);
82 signal sync2 : std_logic_vector(1 to SYNC_STAGES);
83 signal sys_res_n, soft_res_n : std_logic;
85 signal int_req : interrupt_t;
87 signal new_im_data : std_logic;
88 signal im_addr, im_data : gp_register_t;
89 -- signal led2 : std_logic;
91 signal vers, vers_nxt : exec2wb_rec;
102 LEDR(1 to 17) <= (others => '0');
103 LEDG <= (others => '0');
110 fetch_st : fetch_stage
119 clk => sys_clk, --: in std_logic;
120 reset => sys_res_n, --: in std_logic;
121 s_reset => soft_res_n,
124 jump_result => jump_result_pin, --: in instruction_addr_t;
125 prediction_result => prediction_result_pin, --: in instruction_addr_t;
126 branch_prediction_bit => branch_prediction_bit_pin, --: in std_logic;
127 alu_jump_bit => alu_jump_bit_pin, --: in std_logic;
129 -- instruction memory program port :D
130 new_im_data_in => new_im_data,
134 instruction => instruction_pin, --: out instruction_word_t
135 prog_cnt => prog_cnt_pin,
139 decode_st : decode_stage
141 -- active reset value
143 -- active logic value
148 clk => sys_clk, --: in std_logic;
149 reset => sys_res_n and soft_res_n, -- : in std_logic;
152 instruction => instruction_pin, --: in instruction_word_t;
153 prog_cnt => prog_cnt_pin,
154 reg_w_addr => reg_w_addr_pin, --: in std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
155 reg_wr_data => reg_wr_data_pin, --: in gp_register_t;
156 reg_we => reg_we_pin, --: in std_logic;
160 branch_prediction_res => prediction_result_pin, --: instruction_word_t;
161 branch_prediction_bit => branch_prediction_bit_pin, --: std_logic
162 to_next_stage => to_next_stage
165 exec_st : execute_stage
166 generic map(RESET_VALUE)
167 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,
168 data_pin, alu_jump_pin,brpr_pin, wr_en_pin, dmem_pin,dmem_wr_en_pin,hword_pin,byte_s_pin, gpm_out_pin);
170 writeback_st : writeback_stage
171 generic map(RESET_VALUE, '1', "altera", 434)
172 port map(sys_clk, sys_res_n and soft_res_n, result_pin, result_addr_pin, addr_pin, data_pin, alu_jump_pin, brpr_pin,
173 wr_en_pin, dmem_pin, dmem_wr_en_pin, hword_pin, byte_s_pin,
174 reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, jump_result_pin, alu_jump_bit_pin,bus_tx, bus_rx,
175 new_im_data, im_addr, im_data, sseg0, sseg1, sseg2, sseg3, int_req);
179 syn: process(sys_clk, sys_res)
183 if sys_res = RESET_VALUE then
185 sync <= (others => RESET_VALUE);
187 elsif rising_edge(sys_clk) then
189 for i in 2 to SYNC_STAGES loop
190 sync(i) <= sync(i - 1);
193 sync2(1) <= soft_res;
194 for i in 2 to SYNC_STAGES loop
195 sync2(i) <= sync2(i - 1);
202 sys_res_n <= sync(SYNC_STAGES);
203 soft_res_n <= sync2(SYNC_STAGES);
204 nop_pin <= (alu_jump_bit_pin); -- xor brpr_pin);
205 jump_result <= prog_cnt_pin; --jump_result_pin;