Subversion Repositories i2s_interface

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----                                                              ----

---- WISHBONE I2S Interface IP Core                               ----

----                                                              ----

---- This file is part of the I2S Interface project               ----

---- http://www.opencores.org/cores/i2s_interface/                ----

----                                                              ----

---- Description                                                  ----

---- I2S receiver. Top level entity for the receiver core,        ----

---- slave mode.                                                  ----

----                                                              ----

---- To Do:                                                       ----

---- -                                                            ----

----                                                              ----

---- Author(s):                                                   ----

---- - Geir Drange, gedra@opencores.org                           ----

----                                                              ----

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----                                                              ----

---- 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                     ----

----                                                              ----

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--

-- CVS Revision History

--

-- $Log: not supported by cvs2svn $

--

--

library ieee;

use ieee.std_logic_1164.all;

use work.rx_i2s_pack.all;

entity rx_i2s_tops is

  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 rx_i2s_tops;

architecture rtl of rx_i2s_tops is

  signal data_out, version_dout : std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal version_rd : std_logic;

  signal config_rd, config_wr, status_rd : std_logic;

  signal config_dout, status_dout: std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal config_bits : std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal intmask_bits, intmask_dout: std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal intmask_rd, intmask_wr: std_logic;

  signal intstat_dout, intstat_events: std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal intstat_rd, intstat_wr : std_logic;

  signal evt_hsbf, evt_lsbf : std_logic;

  signal mem_wr, mem_rd: std_logic;

  signal sbuf_rd_adr, sbuf_wr_adr : std_logic_vector(ADDR_WIDTH - 2 downto 0);

  signal sbuf_dout, sbuf_din, zeros: std_logic_vector(DATA_WIDTH - 1 downto 0);

  signal conf_res : std_logic_vector(5 downto 0);

  signal conf_ratio : std_logic_vector(7 downto 0);

  signal conf_rswap, conf_rinten, conf_rxen : std_logic;

  signal zero: std_logic;

begin

-- Data bus or'ing 

    data_out <= version_dout or config_dout or intmask_dout or intstat_dout

                when wb_adr_i(ADDR_WIDTH - 1) = '0' else sbuf_dout;

-- Wishbone bus cycle decoder

  WB: rx_i2s_wbd

    generic map (

      DATA_WIDTH => DATA_WIDTH,

      ADDR_WIDTH => ADDR_WIDTH)

    port map (

      wb_clk_i => wb_clk_i,

      wb_rst_i => wb_rst_i,

      wb_sel_i => wb_sel_i,

      wb_stb_i => wb_stb_i,

      wb_we_i => wb_we_i,

      wb_cyc_i => wb_cyc_i,

      wb_bte_i => wb_bte_i,

      wb_cti_i => wb_cti_i,

      wb_adr_i => wb_adr_i,

      data_out => data_out,

      wb_ack_o => wb_ack_o,

      wb_dat_o => wb_dat_o,

      version_rd => version_rd,

      config_rd => config_rd,

      config_wr => config_wr,

      intmask_rd => intmask_rd,

      intmask_wr => intmask_wr,

      intstat_rd => intstat_rd,

      intstat_wr => intstat_wr,

      mem_rd => mem_rd,

      mem_addr => sbuf_rd_adr);

-- TxVersion - Version register

  VER : i2s_version

    generic map (

      DATA_WIDTH => DATA_WIDTH,

      ADDR_WIDTH => ADDR_WIDTH,

      IS_MASTER => 0)

    port map (

      ver_rd => version_rd,

      ver_dout => version_dout);

-- TxConfig - Configuration register

  CG32: if DATA_WIDTH = 32 generate

    CONF: gen_control_reg

      generic map (

        DATA_WIDTH => 32,

        ACTIVE_BIT_MASK => "11100000111111111111110000000000")

      port map (

        clk => wb_clk_i,

        rst => wb_rst_i,

        ctrl_wr => config_wr,

        ctrl_rd => config_rd,

        ctrl_din => wb_dat_i,

        ctrl_dout => config_dout,

        ctrl_bits => config_bits);

    conf_res(5 downto 0) <= config_bits(21 downto 16);

  end generate CG32;

  CG16: if DATA_WIDTH = 16 generate

    CONF: gen_control_reg

      generic map (

        DATA_WIDTH => 16,

        ACTIVE_BIT_MASK => "1110000011111111")

      port map (

        clk => wb_clk_i,

        rst => wb_rst_i,

        ctrl_wr => config_wr,

        ctrl_rd => config_rd,

        ctrl_din => wb_dat_i,

        ctrl_dout => config_dout,

        ctrl_bits => config_bits);

    conf_res(5 downto 0) <= "010000";    -- 16bit only

  end generate CG16;

    conf_ratio(7 downto 0) <= config_bits(15 downto 8);

    conf_rswap <= config_bits(2);

    conf_rinten <= config_bits(1);

    conf_rxen <= config_bits(0);

-- TxIntMask - interrupt mask register

  IM32: if DATA_WIDTH = 32 generate

    IMASK: gen_control_reg

      generic map (

        DATA_WIDTH => 32,

        ACTIVE_BIT_MASK => "11000000000000000000000000000000")

      port map (

        clk => wb_clk_i,

        rst => wb_rst_i,

        ctrl_wr => intmask_wr,

        ctrl_rd => intmask_rd,

        ctrl_din => wb_dat_i,

        ctrl_dout => intmask_dout,

        ctrl_bits => intmask_bits);

  end generate IM32;

  IM16: if DATA_WIDTH = 16 generate

    IMASK: gen_control_reg

      generic map (

        DATA_WIDTH => 16,

        ACTIVE_BIT_MASK => "1100000000000000")

      port map (

        clk => wb_clk_i,

        rst => wb_rst_i,

        ctrl_wr => intmask_wr,

        ctrl_rd => intmask_rd,

        ctrl_din => wb_dat_i,

        ctrl_dout => intmask_dout,

        ctrl_bits => intmask_bits);

  end generate IM16;

-- TxIntStat - interrupt status register

  ISTAT: gen_event_reg

    generic map (

      DATA_WIDTH => DATA_WIDTH)

    port map (

      clk => wb_clk_i,

      rst => wb_rst_i,

      evt_wr => intstat_wr,

      evt_rd => intstat_rd,

      evt_din => wb_dat_i,

      evt_dout => intstat_dout,

      event => intstat_events,

      evt_mask => intmask_bits,

      evt_en => conf_rinten,

      evt_irq => rx_int_o);

    intstat_events(0) <= evt_lsbf;        -- lower sample buffer empty

    intstat_events(1) <= evt_hsbf;        -- higher sampel buffer empty

    intstat_events(DATA_WIDTH - 1 downto 2) <= (others => '0');

-- Sample buffer memory

  MEM: dpram

    generic map (

      DATA_WIDTH => DATA_WIDTH,

      RAM_WIDTH => ADDR_WIDTH - 1)

    port map (

      clk => wb_clk_i,

      rst => wb_rst_i,

      din => sbuf_din,

      wr_en => mem_wr,

      rd_en => mem_rd,

      wr_addr => sbuf_wr_adr,

      rd_addr => sbuf_rd_adr,

      dout => sbuf_dout);

-- Receive decoder

    zero <= '0';

    zeros <= (others => '0');

    DEC: i2s_codec

    generic map (DATA_WIDTH => DATA_WIDTH,

                 ADDR_WIDTH => ADDR_WIDTH,

                 IS_MASTER => 0,

                 IS_RECEIVER => 1)

    port map (

      wb_clk_i => wb_clk_i,

      conf_res => conf_res,

      conf_ratio => conf_ratio,

      conf_swap => conf_rswap,

      conf_inten => conf_rinten,

      conf_en => conf_rxen,

      i2s_sd_i => i2s_sd_i,

      i2s_sck_i => i2s_sck_i,

      i2s_ws_i => i2s_ws_i,

      sample_dat_i => zeros,

      sample_dat_o => sbuf_din,

      mem_rdwr => mem_wr,

      sample_addr => sbuf_wr_adr,

      evt_hsbf => evt_hsbf,

      evt_lsbf => evt_lsbf,

      i2s_sd_o => open,

      i2s_sck_o => open,

      i2s_ws_o => open);

end rtl;