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eexuke |
//--------------------------------------------------------------------------------------------------
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// Design : nova
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// Author(s) : Ke Xu
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// Email : eexuke@yahoo.com
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// File : heading_one_detector.v
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// Generated : June 6, 2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Priority based heading one detection
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//-------------------------------------------------------------------------------------------------
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "nova_defines.v"
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module heading_one_detector (heading_one_en,BitStream_buffer_output,heading_one_pos);
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input heading_one_en;
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input [15:0] BitStream_buffer_output;
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output [3:0] heading_one_pos;
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reg [3:0] heading_one_pos;
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always @ (heading_one_en or BitStream_buffer_output)
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if (heading_one_en == 1'b0)
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begin
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if (BitStream_buffer_output[15] == 1'b1 || BitStream_buffer_output[14] == 1'b1)
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begin
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if (BitStream_buffer_output[15] == 1'b1) heading_one_pos <= 0;
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else heading_one_pos <= 4'd1;
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end
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else if (BitStream_buffer_output[13] == 1'b1 || BitStream_buffer_output[12] == 1'b1 ||
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BitStream_buffer_output[11] == 1'b1 || BitStream_buffer_output[10] == 1'b1)
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begin
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if (BitStream_buffer_output[13] == 1'b1) heading_one_pos <= 4'd2;
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else if (BitStream_buffer_output[12] == 1'b1) heading_one_pos <= 4'd3;
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else if (BitStream_buffer_output[11] == 1'b1) heading_one_pos <= 4'd4;
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else heading_one_pos <= 4'd5;
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end
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else
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begin
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if (BitStream_buffer_output[9] == 1'b1) heading_one_pos <= 4'd6;
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else if (BitStream_buffer_output[8] == 1'b1) heading_one_pos <= 4'd7;
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else if (BitStream_buffer_output[7] == 1'b1) heading_one_pos <= 4'd8;
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else if (BitStream_buffer_output[6] == 1'b1) heading_one_pos <= 4'd9;
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else if (BitStream_buffer_output[5] == 1'b1) heading_one_pos <= 4'd10;
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else if (BitStream_buffer_output[4] == 1'b1) heading_one_pos <= 4'd11;
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else if (BitStream_buffer_output[3] == 1'b1) heading_one_pos <= 4'd12;
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else if (BitStream_buffer_output[2] == 1'b1) heading_one_pos <= 4'd13;
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else if (BitStream_buffer_output[1] == 1'b1) heading_one_pos <= 4'd14;
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else heading_one_pos <= 4'd15;
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end
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end
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else
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heading_one_pos <= 0;
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endmodule
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