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[/] [versatile_library/] [trunk/] [rtl/] [verilog/] [counters.v] - Diff between revs 3 and 4

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//// Public License along with this source; if not, download it   ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
 
 
 
module cnt_shreg_ce ( cke, q, rst, clk);
 
 
 
   parameter length = 4;
 
   input cke;
 
   output reg [0:length-1] q;
 
   input rst;
 
   input clk;
 
 
 
    always @ (posedge clk or posedge rst)
 
    if (rst)
 
        q <= {1'b1,{length-1{1'b0}}};
 
    else
 
        if (cke)
 
            q <= q >> 1;
 
 
 
endmodule
 
 
 
module cnt_shreg_ce_clear ( cke, clear, q, rst, clk);
 
 
 
   parameter length = 4;
 
   input cke;
 
   input clear;
 
   output reg [0:length-1] q;
 
   input rst;
 
   input clk;
 
 
 
    always @ (posedge clk or posedge rst)
 
    if (rst)
 
        q <= {1'b1,{length-1{1'b0}}};
 
    else
 
        if (cke)
 
            if (clear)
 
                q <= {1'b1,{length-1{1'b0}}};
 
            else
 
                q <= q >> 1;
 
 
 
endmodule
 
 
 
 
 
 
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