tb_i2s.vhd

这是一个I2S接口的VHDL实现源代码

----------------------------------------------------------------------
----                                                              ----
---- WISHBONE I2S Interface IP Core                               ----
----                                                              ----
---- This file is part of the I2S Interface project               ----
---- http://www.opencores.org/cores/i2s_interface/                ----
----                                                              ----
---- Description                                                  ----
---- I2S top level test bench. Two transmitters and two receivers ----
---- are instantiated, one each in slave and master mode.         ----
---- Test result is displayed in the log window, there should     ----
---- be no errors.                                                ----
----                                                              ----
---- To Do:                                                       ----
---- -                                                            ----
----                                                              ----
---- Author(s):                                                   ----
---- - Geir Drange, [e-mail]                           ----
----                                                              ----
----------------------------------------------------------------------
----                                                              ----
---- Copyright (C) 2004 Authors and OPENCORES.ORG                 ----
----                                                              ----
---- This source file may be used and distributed without         ----
---- restriction provided that this copyright statement is not    ----
---- removed from the file and that any derivative work contains  ----
---- the original copyright notice and the associated disclaimer. ----
----                                                              ----
---- This source file is free software; you can redistribute it   ----
---- and/or modify it under the terms of the GNU General          ----
---- Public License as published by the Free Software Foundation; ----
---- either version 2.0 of the License, or (at your option) any   ----
---- later version.                                               ----
----                                                              ----
---- This source 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 General Public License for more details.----
----                                                              ----
---- You should have received a copy of the GNU General           ----
---- Public License along with this source; if not, download it   ----
---- from http://www.gnu.org/licenses/gpl.txt                     ----
----                                                              ----
----------------------------------------------------------------------
--
-- CVS Revision History
--
-- $Log: tb_i2s.vhd,v $
-- Revision 1.2  2004/08/07 12:33:29  gedra
-- De-linted.
--
-- Revision 1.1  2004/08/04 14:31:02  gedra
-- Top level test bench.
--
--
--
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.wb_tb_pack.all;
	
entity tb_i2s is  

end tb_i2s;

architecture behav of tb_i2s is

  component tx_i2s_topm 
    generic (DATA_WIDTH: integer range 16 to 32;
             ADDR_WIDTH: integer range 5 to 32);
    port (
      -- Wishbone interface
      wb_clk_i: in std_logic;
      wb_rst_i: in std_logic;
      wb_sel_i: in std_logic;
      wb_stb_i: in std_logic;
      wb_we_i: in std_logic;
      wb_cyc_i: in std_logic;
      wb_bte_i: in std_logic_vector(1 downto 0);
      wb_cti_i: in std_logic_vector(2 downto 0);
      wb_adr_i: in std_logic_vector(ADDR_WIDTH - 1 downto 0);
      wb_dat_i: in std_logic_vector(DATA_WIDTH -1 downto 0);
      wb_ack_o: out std_logic;
      wb_dat_o: out std_logic_vector(DATA_WIDTH - 1 downto 0);
      -- Interrupt line
      tx_int_o: out std_logic;
      -- I2S signals
      i2s_sd_o: out std_logic;
      i2s_sck_o: out std_logic;
      i2s_ws_o: out std_logic);
  end component;

  component tx_i2s_tops 
    generic (DATA_WIDTH: integer range 16 to 32;
             ADDR_WIDTH: integer range 5 to 32);
    port (
      wb_clk_i: in std_logic;
      wb_rst_i: in std_logic;
      wb_sel_i: in std_logic;
      wb_stb_i: in std_logic;
      wb_we_i: in std_logic;
      wb_cyc_i: in std_logic;
      wb_bte_i: in std_logic_vector(1 downto 0);
      wb_cti_i: in std_logic_vector(2 downto 0);
      wb_adr_i: in std_logic_vector(ADDR_WIDTH - 1 downto 0);
      wb_dat_i: in std_logic_vector(DATA_WIDTH -1 downto 0);
      i2s_sck_i: in std_logic;
      i2s_ws_i: in std_logic;
      wb_ack_o: out std_logic;
      wb_dat_o: out std_logic_vector(DATA_WIDTH - 1 downto 0);
      tx_int_o: out std_logic;
      i2s_sd_o: out std_logic);
  end component;

  component rx_i2s_topm 
    generic (DATA_WIDTH: integer range 16 to 32;
             ADDR_WIDTH: integer range 5 to 32);
    port (
      wb_clk_i: in std_logic;
      wb_rst_i: in std_logic;
      wb_sel_i: in std_logic;
      wb_stb_i: in std_logic;
      wb_we_i: in std_logic;
      wb_cyc_i: in std_logic;
      wb_bte_i: in std_logic_vector(1 downto 0);
      wb_cti_i: in std_logic_vector(2 downto 0);
      wb_adr_i: in std_logic_vector(ADDR_WIDTH - 1 downto 0);
      wb_dat_i: in std_logic_vector(DATA_WIDTH -1 downto 0);
      i2s_sd_i: in std_logic;             -- I2S data input
      wb_ack_o: out std_logic;
      wb_dat_o: out std_logic_vector(DATA_WIDTH - 1 downto 0);
      rx_int_o: out std_logic;            -- Interrupt line
      i2s_sck_o: out std_logic;           -- I2S clock out
      i2s_ws_o: out std_logic);           -- I2S word select out
  end component;
  
  component rx_i2s_tops
    generic (DATA_WIDTH: integer range 16 to 32;
             ADDR_WIDTH: integer range 5 to 32);
    port (
      wb_clk_i: in std_logic;
      wb_rst_i: in std_logic;
      wb_sel_i: in std_logic;
      wb_stb_i: in std_logic;
      wb_we_i: in std_logic;
      wb_cyc_i: in std_logic;
      wb_bte_i: in std_logic_vector(1 downto 0);
      wb_cti_i: in std_logic_vector(2 downto 0);
      wb_adr_i: in std_logic_vector(ADDR_WIDTH - 1 downto 0);
      wb_dat_i: in std_logic_vector(DATA_WIDTH -1 downto 0);
      i2s_sd_i: in std_logic;             -- I2S data input
      i2s_sck_i: in std_logic;            -- I2S clock input
      i2s_ws_i: in std_logic;            -- I2S word select input
      wb_ack_o: out std_logic;
      wb_dat_o: out std_logic_vector(DATA_WIDTH - 1 downto 0);
      rx_int_o: out std_logic);           -- Interrupt line
  end component;

  signal wb_clk_o, wb_rst_o, wb_sel_o, wb_stb_o, wb_we_o : std_logic;
  signal wb_cyc_o, wb_ack_i, rx1_int_o: std_logic;
  signal tx_int_o, tx1_ack, rx1_ack, tx2_ack, rx2_ack : std_logic;
  signal rx2_int_o, tx1_int_o, tx2_int_o : std_logic;
  signal wb_bte_o : std_logic_vector(1 downto 0);
  signal wb_cti_o : std_logic_vector(2 downto 0);
  signal wb_adr_o : std_logic_vector(15 downto 0);
  signal wb_dat_i, wb_dat_o, rx1_dat_i: std_logic_vector(31 downto 0);
  signal tx1_dat_i, rx2_dat_i, tx2_dat_i: std_logic_vector(31 downto 0);
  signal wb_stb_32bit_rx1, wb_stb_32bit_tx1 : std_logic;
  signal wb_stb_32bit_rx2, wb_stb_32bit_tx2 : std_logic;
  signal i2s_sd1, i2s_sd2, i2s_sck1, i2s_sck2, i2s_ws1, i2s_ws2: std_logic;
  -- register address definitions
  constant RX1_VERSION : natural := 16#1000#;
  constant RX1_CONFIG  : natural := 16#1001#;
  constant RX1_INTMASK : natural := 16#1002#;
  constant RX1_INTSTAT : natural := 16#1003#;
  constant RX1_BUF_BASE: natural := 16#1020#;
  constant TX1_VERSION : natural := 16#2000#;
  constant TX1_CONFIG  : natural := 16#2001#;
  constant TX1_INTMASK : natural := 16#2002#;
  constant TX1_INTSTAT : natural := 16#2003#;
  constant TX1_BUF_BASE: natural := 16#2020#;
  constant RX2_VERSION : natural := 16#3000#;
  constant RX2_CONFIG  : natural := 16#3001#;
  constant RX2_INTMASK : natural := 16#3002#;
  constant RX2_INTSTAT : natural := 16#3003#;
  constant RX2_BUF_BASE: natural := 16#3020#;
  constant TX2_VERSION : natural := 16#4000#;
  constant TX2_CONFIG  : natural := 16#4001#;
  constant TX2_INTMASK : natural := 16#4002#;
  constant TX2_INTSTAT : natural := 16#4003#;
  constant TX2_BUF_BASE: natural := 16#4020#;
  
begin

  wb_ack_i <= rx1_ack or tx1_ack or rx2_ack or tx2_ack;
  wb_dat_i <= rx1_dat_i when wb_stb_32bit_rx1 = '1'
              else tx1_dat_i when wb_stb_32bit_tx1 = '1'
              else rx2_dat_i when wb_stb_32bit_rx2 = '1'
              else tx2_dat_i when wb_stb_32bit_tx2 = '1'
              else (others => '0');

-- I2S transmitter 1, slave mode
  ITX32S: tx_i2s_tops 
    generic map (DATA_WIDTH => 32,
                 ADDR_WIDTH => 6)
    port map (
      -- Wishbone interface
      wb_clk_i => wb_clk_o,
      wb_rst_i => wb_rst_o,
      wb_sel_i => wb_sel_o,
      wb_stb_i => wb_stb_32bit_tx1,
      wb_we_i => wb_we_o,
      wb_cyc_i => wb_cyc_o,
      wb_bte_i => wb_bte_o,
      wb_cti_i => wb_cti_o,
      wb_adr_i => wb_adr_o(5 downto 0),
      wb_dat_i => wb_dat_o(31 downto 0),
      wb_ack_o => tx1_ack,
      wb_dat_o => tx1_dat_i,
      tx_int_o => tx1_int_o,
      i2s_sd_o => i2s_sd1,
      i2s_sck_i => i2s_sck1,
      i2s_ws_i => i2s_ws1);

-- I2S transmitter 2, master mode
  ITX32M: tx_i2s_topm 
    generic map (DATA_WIDTH => 32,
                 ADDR_WIDTH => 6)
    port map (
      -- Wishbone interface