Subversion Repositories mlite

---------------------------------------------------------------------

---------------------------------------------------------------------

-- TITLE: Random Access Memory

-- TITLE: Random Access Memory

-- AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

-- AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

-- DATE CREATED: 4/21/01

-- DATE CREATED: 4/21/01

-- FILENAME: ram.vhd

-- FILENAME: ram.vhd

-- COPYRIGHT: Software placed into the public domain by the author.

-- COPYRIGHT: Software placed into the public domain by the author.

--    Software 'as is' without warranty.  Author liable for nothing.

--    Software 'as is' without warranty.  Author liable for nothing.

-- DESCRIPTION:

-- DESCRIPTION:

--    Implements the RAM, reads the executable from "code.txt",

--    Implements the RAM, reads the executable from "code.txt",

--    and saves a character to "output.txt" upon a write to 0xffff.

--    and saves a character to "output.txt" upon a write to 0xffff.

use ieee.std_logic_arith.all;

use ieee.std_logic_arith.all;

use ieee.std_logic_textio.all;

use ieee.std_logic_textio.all;

use std.textio.all;

use std.textio.all;

use ieee.std_logic_unsigned.all;

use ieee.std_logic_unsigned.all;

entity ram is

entity ram is

   generic(load_file_name : string);

   generic(load_file_name : string);

   port(clk          : in std_logic;

   port(clk          : in std_logic;

        mem_byte_sel : in std_logic_vector(3 downto 0);

        mem_byte_sel : in std_logic_vector(3 downto 0);