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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

 `include "cypress.v"

   

`ifdef counter4bit_ALREADY_INCLUDED

   

`else

   

`define counter4bit_ALREADY_INCLUDED

   

//`#end` -- edit above this line, do not edit this line

   

 

   

//`#start body` -- edit after this line, do not edit this line

   

 

   

module counter4bit (

   

    Count_Out,

   

    Min,

   

    Max,

   

    Load_Val,

   

Clock,

   

Load,

   

Roll_Enable,

   

Reset

   

);

   

output [3:0] Count_Out;

   

output  Min;

   

output  Max;

   

input   Clock;

   

input   Load;

   

input   Roll_Enable;

   

    input   [3:0] Load_Val;

   

input   Reset;

   

parameter Up_Down = 1;

   

 

   

    reg     [3:0] Count_Out; // current count value

   

    reg     Min; // min output

   

    reg     Max; // max output

   

 

   

    // assign output lines to registers

   

 

   

    // whatever happens to the counter, set min and max accordingly

   

    always @(Count_Out)

   

    begin

   

        Min=(Count_Out==0);

   

        Max=(Count_Out==15);

   

    end

   

    

   

    always @ (posedge Clock or negedge Reset)

   

    begin

   

        // handle async reset

   

        if (Reset==0)

   

            Count_Out <= 4'b000;

   

        else 

   

        // when load is high durign a clock puilse, load the value (and don't count)

   

        if (Load)

   

        begin

   

            Count_Out<=Load_Val;       

   

        end

   

        // count in the right direction

   

        // and check for possible (and allowed) rollover

   

        else if (Up_Down)

   

            if (Roll_Enable || Count_Out!=15)

   

                Count_Out <= Count_Out+1;

   

            else

   

            begin

   

            end

   

        else

   

            if (Roll_Enable || Count_Out!=0)

   

                Count_Out <= Count_Out-1;

   

            else

   

            begin

   

            end

   

    end

   

    

   

endmodule

   

 

   

//`#end` -- edit above this line, do not edit this line

   

 

   

//`#start footer` -- edit after this line, do not edit this line

   

`endif

   

//`#end` -- edit above this line, do not edit this line

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