`timescale 1ns / 1ps
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`timescale 1ns / 1ps
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`include "aDefinitions.v"
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`include "aDefinitions.v"
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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module ArithmeticComparison
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module ArithmeticComparison
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(
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(
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input wire Clock,
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input wire Clock,
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input wire[`WIDTH-1:0] X,Y,
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input wire[`WIDTH-1:0] X,Y,
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input wire[2:0] iOperation,
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input wire[2:0] iOperation,
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input wire iInputReady,
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input wire iInputReady,
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output reg OutputReady,
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output reg OutputReady,
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output reg Result
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output reg Result
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);
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);
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wire [`WIDTH-1:0] wX,wY;
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wire [`WIDTH-1:0] wX,wY;
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wire SignX,SignY;
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wire SignX,SignY;
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reg rGreaterThan;
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reg rGreaterThan;
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wire wUGt,wULT,wEQ;
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wire wUGt,wULT,wEQ;
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assign SignX = (X == 0) ? 0: X[31];
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assign SignX = (X == 0) ? 0: X[31];
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assign SignY = (Y == 0) ? 0: Y[31];
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assign SignY = (Y == 0) ? 0: Y[31];
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assign wX = ( SignX ) ? ~X + 1'b1 : X;
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assign wX = ( SignX ) ? ~X + 1'b1 : X;
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assign wY = ( SignY ) ? ~Y + 1'b1 : Y;
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assign wY = ( SignY ) ? ~Y + 1'b1 : Y;
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assign wUGt = wX > wY;
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assign wUGt = wX > wY;
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assign wULT = wX < wY;
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assign wULT = wX < wY;
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assign wEQ = wX == wY;
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assign wEQ = wX == wY;
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always @ ( * )
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always @ ( * )
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begin
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begin
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case ( {SignX,SignY} )
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case ( {SignX,SignY} )
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//Greater than test ( X > Y )
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//Greater than test ( X > Y )
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2'b00: rGreaterThan = wUGt; //both numbers positive
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2'b00: rGreaterThan = wUGt; //both numbers positive
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2'b01: rGreaterThan = 1; //X positive, y negative
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2'b01: rGreaterThan = 1; //X positive, y negative
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2'b10: rGreaterThan = 0; //X negative, y positive
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2'b10: rGreaterThan = 0; //X negative, y positive
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2'b11: rGreaterThan = wULT; //X negative, y negative
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2'b11: rGreaterThan = wULT; //X negative, y negative
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endcase
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endcase
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end
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end
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always @ ( posedge Clock )
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always @ ( posedge Clock )
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begin
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begin
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if (iInputReady)
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if (iInputReady)
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begin
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begin
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case ( iOperation )
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case ( iOperation )
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3'b000: Result = rGreaterThan; //X > Y
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3'b000: Result = rGreaterThan; //X > Y
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3'b001: Result = ~rGreaterThan; //X < Y
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3'b001: Result = ~rGreaterThan; //X < Y
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3'b010: Result = wEQ; //X == Y
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3'b010: Result = wEQ; //X == Y
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3'b011: Result = ~wEQ; //X != Y
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3'b011: Result = ~wEQ; //X != Y
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3'b100: Result = rGreaterThan || wEQ; // X >= Y
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3'b100: Result = rGreaterThan || wEQ; // X >= Y
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3'b101: Result = ~rGreaterThan || wEQ; // X <= Y
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3'b101: Result = ~rGreaterThan || wEQ; // X <= Y
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default: Result = 0;
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default: Result = 0;
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endcase
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endcase
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OutputReady = 1;
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OutputReady = 1;
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end
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end
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else
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else
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OutputReady = 0;
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OutputReady = 0;
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end
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end
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endmodule
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endmodule
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