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;
8 -------------------------------------------------------------------------------
10 -------------------------------------------------------------------------------
16 -------------------------------------------------------------------------------
18 -------------------------------------------------------------------------------
19 architecture behavior of pipeline_tb is
21 constant cc : time := 20 ns; -- test clock period
22 constant SYS_CLOCK_FREQ : integer := 50000000;
23 constant BAUD_COUNT : integer := SYS_CLOCK_FREQ/115200;
25 signal sys_clk_pin : std_logic;
26 signal sys_res_n_pin : std_logic;
29 signal dummy : std_logic;
31 signal jump_result_pin : instruction_addr_t;
32 signal prediction_result_pin : instruction_addr_t;
33 signal branch_prediction_bit_pin : std_logic;
34 signal alu_jump_bit_pin : std_logic;
35 signal instruction_pin : instruction_word_t;
36 signal prog_cnt : instruction_addr_t;
38 signal reg_w_addr_pin : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
39 signal reg_wr_data_pin : gp_register_t;
40 signal reg_we_pin : std_logic;
41 signal to_next_stage_pin : dec_op;
43 signal result_pin : gp_register_t;--reg
44 signal result_addr_pin : gp_addr_t;--reg
45 signal addr_pin : word_t; --memaddr
46 signal data_pin : gp_register_t; --mem data --ureg
47 signal alu_jump_pin : std_logic;--reg
48 signal brpr_pin : std_logic; --reg
49 signal wr_en_pin : std_logic;--regop --reg
50 signal dmem_pin : std_logic;--memop
51 signal dmem_wr_en_pin : std_logic;
52 signal hword_pin : std_logic;
53 signal byte_s_pin, tx_pin, rx_pin : std_logic;
55 signal gpm_in_pin : extmod_rec;
56 signal gpm_out_pin : gp_register_t;
57 signal nop_pin : std_logic;
59 signal cycle_cnt : integer;
61 signal sseg0, sseg1, sseg2, sseg3 : std_logic_vector(0 to 6);
66 -- instruction_ram : r_w_ram
68 -- PHYS_INSTR_ADDR_WIDTH,
74 -- instr_w_addr(PHYS_INSTR_ADDR_WIDTH-1 downto 0),
75 -- instr_r_addr_nxt(PHYS_INSTR_ADDR_WIDTH-1 downto 0),
81 fetch_st : fetch_stage
90 clk => sys_clk_pin, --: in std_logic;
91 reset => sys_res_n_pin, --: in std_logic;
94 jump_result => jump_result_pin, --: in instruction_addr_t;
95 prediction_result => prediction_result_pin, --: in instruction_addr_t;
96 branch_prediction_bit => branch_prediction_bit_pin, --: in std_logic;
97 alu_jump_bit => alu_jump_bit_pin, --: in std_logic;
100 instruction => instruction_pin, --: out instruction_word_t
104 decode_st : decode_stage
106 -- active reset value
108 -- active logic value
114 clk => sys_clk_pin, --: in std_logic;
115 reset => sys_res_n_pin, -- : in std_logic;
118 instruction => instruction_pin, --: in instruction_word_t;
119 prog_cnt => prog_cnt,
120 reg_w_addr => reg_w_addr_pin, --: in std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
121 reg_wr_data => reg_wr_data_pin, --: in gp_register_t;
122 reg_we => reg_we_pin, --: in std_logic;
126 branch_prediction_res => prediction_result_pin, --: instruction_word_t;
127 branch_prediction_bit => branch_prediction_bit_pin, --: std_logic
128 to_next_stage => to_next_stage_pin
131 exec_st : execute_stage
133 port map(sys_clk_pin, sys_res_n_pin,to_next_stage_pin,reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, gpm_in_pin, result_pin, result_addr_pin,addr_pin,
134 data_pin, alu_jump_pin,brpr_pin, wr_en_pin, dmem_pin,dmem_wr_en_pin,hword_pin,byte_s_pin, gpm_out_pin);
136 writeback_st : writeback_stage
137 generic map('0', '1')
138 port map(sys_clk_pin, sys_res_n_pin, result_pin, result_addr_pin, addr_pin, data_pin, alu_jump_pin, brpr_pin,
139 wr_en_pin, dmem_pin, dmem_wr_en_pin, hword_pin, byte_s_pin,
140 reg_wr_data_pin, reg_we_pin, reg_w_addr_pin, jump_result_pin, alu_jump_bit_pin, tx_pin, rx_pin, sseg0, sseg1, sseg2, sseg3);
145 nop_pin <= (alu_jump_bit_pin);-- xor brpr_pin);
147 -------------------------------------------------------------------------------
148 -- generate simulation clock
149 -------------------------------------------------------------------------------
159 cnt : process(sys_clk_pin, sys_res_n_pin)
163 if (sys_res_n_pin = '0') then
165 elsif (sys_clk_pin'event and sys_clk_pin = '1') then
166 cycle_cnt <= cycle_cnt + 1;
170 -------------------------------------------------------------------------------
172 -------------------------------------------------------------------------------
175 -- wait for n clock cycles
176 procedure icwait(cycles : natural) is
178 for i in 1 to cycles loop
179 wait until sys_clk_pin = '1' and sys_clk_pin'event;
183 procedure txd(trans_data : in std_logic_vector) is
186 rx_pin <= trans_data(i);
195 -----------------------------------------------------------------------------
197 -----------------------------------------------------------------------------
198 sys_res_n_pin <= '0';
199 -- reg_w_addr_pin <= (others => '0');
200 -- reg_wr_data_pin <= (others => '0');
201 -- reg_we_pin <= '0';
205 sys_res_n_pin <= '1';
206 wait until sys_res_n_pin = '1';
214 ---------------------------------------------------------------------------
216 ---------------------------------------------------------------------------
218 report "Test finished"
226 -------------------------------------------------------------------------------
228 -------------------------------------------------------------------------------
229 configuration pipeline_conf_beh of pipeline_tb is
231 for fetch_st : fetch_stage use entity work.fetch_stage(behav);
233 for decode_st : decode_stage use entity work.decode_stage(behav);
235 for exec_st : execute_stage use entity work.execute_stage(behav);
237 for writeback_st : writeback_stage use entity work.writeback_stage(behav);
241 end pipeline_conf_beh;