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[/] [wb_conmax/] [trunk/] [rtl/] [verilog/] [wb_conmax_pri_enc.v] - Rev 5
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///////////////////////////////////////////////////////////////////// //// //// //// WISHBONE Connection Matrix Priority Encoder //// //// //// //// //// //// Author: Rudolf Usselmann //// //// rudi@asics.ws //// //// //// //// //// //// Downloaded from: http://www.opencores.org/cores/wb_conmax/ //// //// //// ///////////////////////////////////////////////////////////////////// //// //// //// 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: wb_conmax_pri_enc.v,v 1.2 2002-10-03 05:40:07 rudi Exp $ // // $Date: 2002-10-03 05:40:07 $ // $Revision: 1.2 $ // $Author: rudi $ // $Locker: $ // $State: Exp $ // // Change History: // $Log: not supported by cvs2svn $ // Revision 1.1.1.1 2001/10/19 11:01:41 rudi // WISHBONE CONMAX IP Core // // // // // `include "wb_conmax_defines.v" module wb_conmax_pri_enc( valid, pri0, pri1, pri2, pri3, pri4, pri5, pri6, pri7, pri_out ); //////////////////////////////////////////////////////////////////// // // Module Parameters // parameter [1:0] pri_sel = 2'd0; //////////////////////////////////////////////////////////////////// // // Module IOs // input [7:0] valid; input [1:0] pri0, pri1, pri2, pri3; input [1:0] pri4, pri5, pri6, pri7; output [1:0] pri_out; //////////////////////////////////////////////////////////////////// // // Local Wires // wire [3:0] pri0_out, pri1_out, pri2_out, pri3_out; wire [3:0] pri4_out, pri5_out, pri6_out, pri7_out; wire [3:0] pri_out_tmp; reg [1:0] pri_out0, pri_out1; wire [1:0] pri_out; //////////////////////////////////////////////////////////////////// // // Priority Decoders // wb_conmax_pri_dec #(pri_sel) pd0( .valid( valid[0] ), .pri_in( pri0 ), .pri_out( pri0_out ) ); wb_conmax_pri_dec #(pri_sel) pd1( .valid( valid[1] ), .pri_in( pri1 ), .pri_out( pri1_out ) ); wb_conmax_pri_dec #(pri_sel) pd2( .valid( valid[2] ), .pri_in( pri2 ), .pri_out( pri2_out ) ); wb_conmax_pri_dec #(pri_sel) pd3( .valid( valid[3] ), .pri_in( pri3 ), .pri_out( pri3_out ) ); wb_conmax_pri_dec #(pri_sel) pd4( .valid( valid[4] ), .pri_in( pri4 ), .pri_out( pri4_out ) ); wb_conmax_pri_dec #(pri_sel) pd5( .valid( valid[5] ), .pri_in( pri5 ), .pri_out( pri5_out ) ); wb_conmax_pri_dec #(pri_sel) pd6( .valid( valid[6] ), .pri_in( pri6 ), .pri_out( pri6_out ) ); wb_conmax_pri_dec #(pri_sel) pd7( .valid( valid[7] ), .pri_in( pri7 ), .pri_out( pri7_out ) ); //////////////////////////////////////////////////////////////////// // // Priority Encoding // assign pri_out_tmp = pri0_out | pri1_out | pri2_out | pri3_out | pri4_out | pri5_out | pri6_out | pri7_out; // 4 Priority Levels always @(pri_out_tmp) if(pri_out_tmp[3]) pri_out1 = 2'h3; else if(pri_out_tmp[2]) pri_out1 = 2'h2; else if(pri_out_tmp[1]) pri_out1 = 2'h1; else pri_out1 = 2'h0; // 2 Priority Levels always @(pri_out_tmp) if(pri_out_tmp[1]) pri_out0 = 2'h1; else pri_out0 = 2'h0; //////////////////////////////////////////////////////////////////// // // Final Priority Output // // Select configured priority assign pri_out = (pri_sel==2'd0) ? 2'h0 : ( (pri_sel==2'd1) ? pri_out0 : pri_out1 ); endmodule
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