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[/] [pcie_ds_dma/] [trunk/] [core/] [wishbone/] [cross/] [wb_conmax_pri_dec.v] - Rev 44
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///////////////////////////////////////////////////////////////////// //// //// //// WISHBONE Connection Matrix Priority Decoder //// //// //// //// //// //// 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_dec.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 11:01:42 rudi // WISHBONE CONMAX IP Core // // // // // //`include "wb_conmax_defines.v" `timescale 1ns / 10ps module wb_conmax_pri_dec(valid, pri_in, pri_out); //////////////////////////////////////////////////////////////////// // // Module Parameters // parameter [1:0] pri_sel = 2'd0; //////////////////////////////////////////////////////////////////// // // Module IOs // input valid; input [1:0] pri_in; output [3:0] pri_out; //////////////////////////////////////////////////////////////////// // // Local Wires // wire [3:0] pri_out; reg [3:0] pri_out_d0; reg [3:0] pri_out_d1; //////////////////////////////////////////////////////////////////// // // Priority Decoder // // 4 Priority Levels always @(valid or pri_in) if(!valid) pri_out_d1 = 4'b0001; else if(pri_in==2'h0) pri_out_d1 = 4'b0001; else if(pri_in==2'h1) pri_out_d1 = 4'b0010; else if(pri_in==2'h2) pri_out_d1 = 4'b0100; else pri_out_d1 = 4'b1000; // 2 Priority Levels always @(valid or pri_in) if(!valid) pri_out_d0 = 4'b0001; else if(pri_in==2'h0) pri_out_d0 = 4'b0001; else pri_out_d0 = 4'b0010; // Select Configured Priority assign pri_out = (pri_sel==2'd0) ? 4'h0 : ( (pri_sel==1'd1) ? pri_out_d0 : pri_out_d1 ); endmodule
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