mips_sys

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.NUMERIC_STD.ALL;
ENTITY e_block_fifo_dc IS
    GENERIC (
        addr_width: natural;
        data_width: natural
    );
    PORT (
        rst:       IN  std_logic;
        wr_clk:    IN  std_logic;
        o_wr_rdy:  OUT std_logic;
        i_wr_data: IN  std_logic_vector(data_width - 1 DOWNTO 0);
        i_wr_en:   IN  std_logic;
        rd_clk:    IN  std_logic;
        o_rd_rdy:  OUT std_logic;
        o_rd_data: OUT std_logic_vector(data_width - 1 DOWNTO 0);
        i_rd_en:   IN  std_logic
    );
END ENTITY e_block_fifo_dc;
ARCHITECTURE a_block_fifo_dc OF e_block_fifo_dc IS
    COMPONENT e_block_rwram_dc
        GENERIC (
            addr_width: natural;
            data_width: natural := 8
        );
        PORT (
            rd_clk:    IN  std_logic;
            i_rd_addr: IN  std_logic_vector(addr_width - 1 DOWNTO 0);
            o_rd_data: OUT std_logic_vector(data_width - 1 DOWNTO 0);
            wr_clk:    IN  std_logic;
            i_wr_addr: IN  std_logic_vector(addr_width - 1 DOWNTO 0);
            i_wr_data: IN  std_logic_vector(data_width - 1 DOWNTO 0);
            i_wr_en:   IN  std_logic
        );
    END COMPONENT e_block_rwram_dc;
    SUBTYPE t_pos  IS natural RANGE 0 TO 2 ** addr_width - 1;
    SUBTYPE t_addr IS std_logic_vector(addr_width - 1 DOWNTO 0);
    SUBTYPE t_data IS std_logic_vector(data_width - 1 DOWNTO 0);
    SIGNAL r_rd_begin:         t_pos     := 0;
    SIGNAL n_rd_begin:         t_pos;
    SIGNAL s_rd_begin_addr:    t_addr;
    SIGNAL s_rd_begin_sn_addr: t_addr; -- _sn_ means sometimes next
    SIGNAL s_rd_rdy:           std_logic;
    SIGNAL s_rd_en:            std_logic;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX