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/////////////////////////////////////////////////////////////////////
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//// ////
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//// WISHBONE Connection Matrix Priority Decoder ////
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//// ////
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//// ////
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//// Author: Rudolf Usselmann ////
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//// rudi@asics.ws ////
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//// ////
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//// ////
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//// Downloaded from: http://www.opencores.org/cores/wb_conmax/ ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2000-2002 Rudolf Usselmann ////
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//// www.asics.ws ////
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//// rudi@asics.ws ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer.////
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//// ////
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//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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// CVS Log
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//
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// $Id: wb_conmax_pri_dec.v,v 1.2 2002-10-03 05:40:07 rudi Exp $
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//
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// $Date: 2002-10-03 05:40:07 $
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// $Revision: 1.2 $
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// $Author: rudi $
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// $Locker: $
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// $State: Exp $
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//
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// Change History:
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// $Log: not supported by cvs2svn $
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// Revision 1.1.1.1 2001/10/19 11:01:42 rudi
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// WISHBONE CONMAX IP Core
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//
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//
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//
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//
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//
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`include "wb_conmax_defines.v"
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module wb_conmax_pri_dec(valid, pri_in, pri_out);
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////////////////////////////////////////////////////////////////////
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//
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// Module Parameters
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//
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parameter [1:0] pri_sel = 2'd0;
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////////////////////////////////////////////////////////////////////
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//
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// Module IOs
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//
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input valid;
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input [1:0] pri_in;
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output [3:0] pri_out;
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////////////////////////////////////////////////////////////////////
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//
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// Local Wires
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//
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wire [3:0] pri_out;
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reg [3:0] pri_out_d0;
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reg [3:0] pri_out_d1;
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////////////////////////////////////////////////////////////////////
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//
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// Priority Decoder
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//
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// 4 Priority Levels
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always @(valid or pri_in)
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if(!valid) pri_out_d1 = 4'b0001;
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else
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if(pri_in==2'h0) pri_out_d1 = 4'b0001;
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else
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if(pri_in==2'h1) pri_out_d1 = 4'b0010;
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else
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if(pri_in==2'h2) pri_out_d1 = 4'b0100;
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else pri_out_d1 = 4'b1000;
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// 2 Priority Levels
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always @(valid or pri_in)
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if(!valid) pri_out_d0 = 4'b0001;
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else
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if(pri_in==2'h0) pri_out_d0 = 4'b0001;
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else pri_out_d0 = 4'b0010;
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// Select Configured Priority
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assign pri_out = (pri_sel==2'd0) ? 4'h0 : ( (pri_sel==1'd1) ? pri_out_d0 : pri_out_d1 );
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endmodule
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