Subversion Repositories ac97

/////////////////////////////////////////////////////////////////////

////                                                             ////

////  WISHBONE AC 97 Controller                                  ////

////  Serial Input Block                                         ////

////                                                             ////

////                                                             ////

////  Author: Rudolf Usselmann                                   ////

////          rudi@asics.ws                                      ////

////                                                             ////

////                                                             ////

////  Downloaded from: http://www.opencores.org/cores/ac97_ctrl/ ////

////                                                             ////

/////////////////////////////////////////////////////////////////////

////                                                             ////

//// Copyright (C) 2000-2002 Rudolf Usselmann                    ////

////                         www.asics.ws                        ////

////                         rudi@asics.ws                       ////

////                                                             ////

//// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////

//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////

//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////

//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////

//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////

//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////

//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////

//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////

//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////

//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////

//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////

//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////

//// POSSIBILITY OF SUCH DAMAGE.                                 ////

////                                                             ////

/////////////////////////////////////////////////////////////////////

//  CVS Log

//

//  $Id: ac97_sin.v,v 1.2 2002-09-19 06:30:56 rudi Exp $

//

//  $Date: 2002-09-19 06:30:56 $

//  $Revision: 1.2 $

//  $Author: rudi $

//  $Locker:  $

//  $State: Exp $

//

// Change History:

//               $Log: not supported by cvs2svn $

//               Revision 1.1  2001/08/03 06:54:50  rudi

//

//

//               - Changed to new directory structure

//

//               Revision 1.1.1.1  2001/05/19 02:29:15  rudi

//               Initial Checkin

//

//

//

//

`include "ac97_defines.v"

module ac97_sin(clk, rst,

        out_le, slt0, slt1, slt2, slt3, slt4,

        slt6,

        sdata_in

        );

input           clk, rst;

// --------------------------------------

// Misc Signals

input   [5:0]    out_le;

output  [15:0]   slt0;

output  [19:0]   slt1;

output  [19:0]   slt2;

output  [19:0]   slt3;

output  [19:0]   slt4;

output  [19:0]   slt6;

// --------------------------------------

// AC97 Codec Interface

input           sdata_in;

////////////////////////////////////////////////////////////////////

//

// Local Wires

//

reg             sdata_in_r;

reg     [19:0]   sr;

reg     [15:0]   slt0;

reg     [19:0]   slt1;

reg     [19:0]   slt2;

reg     [19:0]   slt3;

reg     [19:0]   slt4;

reg     [19:0]   slt6;

////////////////////////////////////////////////////////////////////

//

// Output Registers

//

always @(posedge clk)

        if(out_le[0])    slt0 <= #1 sr[15:0];

always @(posedge clk)

        if(out_le[1])   slt1 <= #1 sr;

always @(posedge clk)

        if(out_le[2])   slt2 <= #1 sr;

always @(posedge clk)

        if(out_le[3])   slt3 <= #1 sr;

always @(posedge clk)

        if(out_le[4])   slt4 <= #1 sr;

always @(posedge clk)

        if(out_le[5])   slt6 <= #1 sr;

////////////////////////////////////////////////////////////////////

//

// Serial Shift Register

//

always @(negedge clk)

        sdata_in_r <= #1 sdata_in;

always @(posedge clk)

        sr <= #1 {sr[18:0], sdata_in_r };

endmodule