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/////////////////////////////////////////////////////////////////////
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//// ////
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//// WISHBONE Connection Matrix Priority Encoder ////
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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_enc.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 11:01:41 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_enc(
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valid,
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pri0, pri1, pri2, pri3,
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pri4, pri5, pri6, pri7,
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pri_out
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);
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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 [7:0] valid;
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input [1:0] pri0, pri1, pri2, pri3;
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input [1:0] pri4, pri5, pri6, pri7;
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output [1:0] 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] pri0_out, pri1_out, pri2_out, pri3_out;
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wire [3:0] pri4_out, pri5_out, pri6_out, pri7_out;
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wire [3:0] pri_out_tmp;
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reg [1:0] pri_out0, pri_out1;
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wire [1:0] pri_out;
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////////////////////////////////////////////////////////////////////
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//
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// Priority Decoders
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//
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wb_conmax_pri_dec #(pri_sel) pd0(
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.valid( valid[0] ),
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.pri_in( pri0 ),
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.pri_out( pri0_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd1(
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.valid( valid[1] ),
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.pri_in( pri1 ),
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.pri_out( pri1_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd2(
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.valid( valid[2] ),
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.pri_in( pri2 ),
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.pri_out( pri2_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd3(
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.valid( valid[3] ),
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.pri_in( pri3 ),
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.pri_out( pri3_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd4(
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.valid( valid[4] ),
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.pri_in( pri4 ),
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.pri_out( pri4_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd5(
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.valid( valid[5] ),
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.pri_in( pri5 ),
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.pri_out( pri5_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd6(
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.valid( valid[6] ),
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.pri_in( pri6 ),
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.pri_out( pri6_out )
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);
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wb_conmax_pri_dec #(pri_sel) pd7(
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.valid( valid[7] ),
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.pri_in( pri7 ),
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.pri_out( pri7_out )
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);
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////////////////////////////////////////////////////////////////////
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//
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// Priority Encoding
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//
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assign pri_out_tmp = pri0_out | pri1_out | pri2_out | pri3_out |
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pri4_out | pri5_out | pri6_out | pri7_out;
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// 4 Priority Levels
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always @(pri_out_tmp)
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if(pri_out_tmp[3]) pri_out1 = 2'h3;
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else
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if(pri_out_tmp[2]) pri_out1 = 2'h2;
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else
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if(pri_out_tmp[1]) pri_out1 = 2'h1;
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else pri_out1 = 2'h0;
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// 2 Priority Levels
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always @(pri_out_tmp)
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if(pri_out_tmp[1]) pri_out0 = 2'h1;
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else pri_out0 = 2'h0;
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////////////////////////////////////////////////////////////////////
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//
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// Final Priority Output
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//
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// Select configured priority
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assign pri_out = (pri_sel==2'd0) ? 2'h0 : ( (pri_sel==2'd1) ? pri_out0 : pri_out1 );
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endmodule
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