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library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

use ieee.numeric_std.all;

use std.textio.all;

use work.whisk_constants.all;

entity singleport_mem is

    generic (

    memsize, addr_width, data_width : integer);

        port (

                clk : in std_logic;

                we : in std_logic;

                addr : in std_logic_vector(addr_width - 1 downto 0);

                di : in std_logic_vector(data_width - 1 downto 0);

                do : out std_logic_vector(data_width - 1 downto 0)

        );

end entity singleport_mem;

architecture behav of singleport_mem is

        type ram_type is array (0 to memsize - 1) of bit_vector(data_width - 1 downto 0);

        signal read_a : std_logic_vector(addr_width - 1 downto 0);

signal RAM : ram_type;

begin

        process(clk)

                begin

            --capture on rising edge, gives registered output. 

                        if rising_edge(clk) then

                                if (we = '1') then

                                        RAM(to_integer(unsigned(addr))) <= to_bitvector(di);

                                end if;

                                read_a <= addr;

                        end if;

        end process;

        do <= to_stdlogicvector(RAM(to_integer(unsigned(read_a))));

end behav;