Inital version

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2010-04-08 15:44:55 +00:00
parent 76eb2dfe32
commit 1abe64b3b4
2 changed files with 165 additions and 0 deletions
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+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.NUMERIC_STD.ALL;
+use std.textio.all; --  Imports the standard textio package.
+
+use work.utils_pkg.all; --  Imports the standard textio package.
+
+ENTITY crc32 IS
+	Port
+	(
+		rst			: in  STD_LOGIC;
+		clk			: in  STD_LOGIC;
+		din_vld		: in  STD_LOGIC;
+		din			: in  unsigned(7 downto 0);
+		crc32_vld	: out STD_LOGIC;
+		crc32_out	: out unsigned(31 downto 0)
+		
+	);
+END crc32;
+
+ARCHITECTURE behavior OF crc32 IS
+
+	type crc_table_t is array (0 to 15) of unsigned(31 downto 0);
+	
+	constant crc_table	: crc_table_t :=
+	(
+		X"4DBDF21C", X"500AE278", X"76D3D2D4", X"6B64C2B0",
+		X"3B61B38C", X"26D6A3E8", X"000F9344", X"1DB88320",
+		X"A005713C", X"BDB26158", X"9B6B51F4", X"86DC4190",
+		X"D6D930AC", X"CB6E20C8", X"EDB71064", X"F0000000"
+	);
+	
+	signal crc0		: unsigned(31 downto 0);
+	signal crc1		: unsigned(31 downto 0);
+	signal crc2		: unsigned(31 downto 0);
+	
+--------------------------------------------------------------------------
+begin
+
+	crc1	<= X"0" & crc0(31 downto 4) xor crc_table(to_integer(crc0(3 downto 0) xor din(3 downto 0)));
+	crc2	<= X"0" & crc1(31 downto 4) xor crc_table(to_integer(crc1(3 downto 0) xor din(7 downto 4)));
+	
+	crc32_out	<= crc0;
+	
+--------------------------------------------------------------------------
+process(clk)
+begin
+	if rising_edge(clk) then
+		crc32_vld	<= not rst and din_vld;
+		if rst = '1' then
+			crc0		<= (others => '0');
+		elsif din_vld = '1' then	
+			crc0		<= crc2;
+		end if;
+	end if;
+end process;
+
+--------------------------------------------------------------------------
+end behavior;
@@ -0,0 +1,106 @@
+-------------------------------------------------------------------------
+-- Project: JCPU, a portable 8-bit RISC CPU written in VHDL
+-- This file: testbench for system test using Xilinx ML-402
+
+-- Copyright (C) 2007 J. Ahrensfeld
+
+-- This library is free software; you can redistribute it and/or
+-- modify it under the terms of the GNU Lesser General Public
+-- License as published by the Free Software Foundation; either
+-- version 2.1 of the License, or (at your option) any later version.
+
+-- This library is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+-- Lesser General Public License for more details.
+
+-- You should have received a copy of the GNU Lesser General Public
+-- License along with this library; if not, write to the Free Software
+-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+-- For questions and ideas, please contact the author at jens@jayfield.org
+
+-----------------------------------------------------------------------
+
+LIBRARY ieee;
+use IEEE.STD_LOGIC_1164.ALL;
+USE ieee.numeric_std.ALL;
+
+ENTITY tb_crc32 IS
+END tb_crc32;
+
+ARCHITECTURE behavior OF tb_crc32 IS 
+
+	constant CLK_PERIOD		: time := 10 ns;
+
+	signal CLK				: std_logic := '1';
+	signal RST				: std_logic := '1';
+
+	signal din_vld			: std_logic := '0';
+	signal din				: unsigned(7 downto 0) := (others => '-');
+	signal crc32			: unsigned(31 downto 0);
+	signal crc32_vld		: std_logic;
+
+
+	type byte_array_t is array (0 to 61) of unsigned(7 downto 0);
+	
+	signal test_data : byte_array_t :=
+	(
+		X"00", X"0A", X"E6", X"F0", X"05", X"A3", X"00", X"12",
+		X"34", X"56", X"78", X"90", X"08", X"00", X"45", X"00",
+		X"00", X"30", X"B3", X"FE", X"00", X"00", X"80", X"11",
+		X"72", X"BA", X"0A", X"00", X"00", X"03", X"0A", X"00",
+		X"00", X"02", X"04", X"00", X"04", X"00", X"00", X"1C",
+		X"89", X"4D", X"00", X"01", X"02", X"03", X"04", X"05",
+		X"06", X"07", X"08", X"09", X"0A", X"0B", X"0C", X"0D",
+		X"0E", X"0F", X"10", X"11", X"12", X"13"
+	);
+	
+BEGIN
+
+inst_crc32: entity work.crc32
+	PORT MAP
+	(
+		rst				=> RST,
+		clk				=> CLK,
+		din_vld			=> din_vld,
+		din				=> din,
+		crc32_vld		=> crc32_vld,
+		crc32_out		=> crc32
+		
+	);
+
+
+CLK_GEN: process
+	begin
+		wait for CLK_PERIOD/2;
+		CLK <= not CLK;
+	end process;
+
+
+-- Master
+STIMULUS: process
+
+
+	begin
+
+		wait for 6*CLK_PERIOD;
+		RST <= '0';
+		wait for 6*CLK_PERIOD;
+
+		wait until rising_edge(CLK);
+
+		for i in 0 to 61 loop
+			din_vld	<= '1';
+			din		<= test_data(i);
+			wait until rising_edge(CLK);
+		end loop;
+
+		din		<= (others => '-');
+		din_vld	<= '0';
+
+		wait; 
+	
+	end process;
+	
+END;