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<##//////////////////////////////////////////////////////////////////
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//// ////
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//// Author: Eyal Hochberg ////
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//// eyal@provartec.com ////
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//// ////
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//// Downloaded from: http://www.opencores.org ////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2010 Provartec LTD ////
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//// www.provartec.com ////
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//// info@provartec.com ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer.////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation.////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more////
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//// details. http://www.gnu.org/licenses/lgpl.html ////
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//// ////
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//////////////////////////////////////////////////////////////////##>
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OUTFILE prgen_fifo.v
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OUTFILE prgen_fifo.v
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module prgen_fifo(PORTS);
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module prgen_fifo(PORTS);
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parameter WIDTH = 8;
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parameter WIDTH = 8;
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parameter DEPTH_FULL = 8;
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parameter DEPTH_FULL = 8;
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parameter SINGLE = DEPTH_FULL == 1;
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parameter SINGLE = DEPTH_FULL == 1;
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parameter DEPTH = SINGLE ? 1 : DEPTH_FULL -1;
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parameter DEPTH = SINGLE ? 1 : DEPTH_FULL -1;
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parameter DEPTH_BITS =
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parameter DEPTH_BITS =
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(DEPTH <= 2) ? 1 :
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(DEPTH <= 2) ? 1 :
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(DEPTH <= 4) ? 2 :
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(DEPTH <= 4) ? 2 :
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(DEPTH <= 8) ? 3 :
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(DEPTH <= 8) ? 3 :
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(DEPTH <= 16) ? 4 :
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(DEPTH <= 16) ? 4 :
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(DEPTH <= 32) ? 5 :
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(DEPTH <= 32) ? 5 :
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(DEPTH <= 64) ? 6 :
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(DEPTH <= 64) ? 6 :
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(DEPTH <= 128) ? 7 :
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(DEPTH <= 128) ? 7 :
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(DEPTH <= 256) ? 8 : 0; //0 is ilegal
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(DEPTH <= 256) ? 8 : 0; //0 is ilegal
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parameter LAST_LINE = DEPTH-1;
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parameter LAST_LINE = DEPTH-1;
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input clk;
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input clk;
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input reset;
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input reset;
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input push;
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input push;
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input pop;
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input pop;
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input [WIDTH-1:0] din;
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input [WIDTH-1:0] din;
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output [WIDTH-1:0] dout;
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output [WIDTH-1:0] dout;
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//output next;
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//output next;
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output empty;
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output empty;
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output full;
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output full;
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wire reg_push;
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wire reg_push;
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wire reg_pop;
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wire reg_pop;
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wire fifo_push;
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wire fifo_push;
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wire fifo_pop;
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wire fifo_pop;
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reg [DEPTH-1:0] fullness_in;
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reg [DEPTH-1:0] fullness_in;
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reg [DEPTH-1:0] fullness_out;
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reg [DEPTH-1:0] fullness_out;
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reg [DEPTH-1:0] fullness;
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reg [DEPTH-1:0] fullness;
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reg [WIDTH-1:0] fifo [DEPTH-1:0];
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reg [WIDTH-1:0] fifo [DEPTH-1:0];
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wire fifo_empty;
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wire fifo_empty;
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wire next;
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wire next;
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reg [WIDTH-1:0] dout;
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reg [WIDTH-1:0] dout;
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reg dout_empty;
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reg dout_empty;
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reg [DEPTH_BITS-1:0] ptr_in;
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reg [DEPTH_BITS-1:0] ptr_in;
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reg [DEPTH_BITS-1:0] ptr_out;
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reg [DEPTH_BITS-1:0] ptr_out;
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assign reg_push = push & fifo_empty & (dout_empty | pop);
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assign reg_push = push & fifo_empty & (dout_empty | pop);
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assign reg_pop = pop & fifo_empty;
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assign reg_pop = pop & fifo_empty;
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assign fifo_push = !SINGLE & push & (~reg_push);
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assign fifo_push = !SINGLE & push & (~reg_push);
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assign fifo_pop = !SINGLE & pop & (~reg_pop);
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assign fifo_pop = !SINGLE & pop & (~reg_pop);
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always @(posedge clk or posedge reset)
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always @(posedge clk or posedge reset)
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if (reset)
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if (reset)
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begin
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begin
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dout <= #FFD {WIDTH{1'b0}};
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dout <= #FFD {WIDTH{1'b0}};
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dout_empty <= #FFD 1'b1;
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dout_empty <= #FFD 1'b1;
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end
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end
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else if (reg_push)
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else if (reg_push)
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begin
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begin
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dout <= #FFD din;
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dout <= #FFD din;
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dout_empty <= #FFD 1'b0;
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dout_empty <= #FFD 1'b0;
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end
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end
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else if (reg_pop)
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else if (reg_pop)
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begin
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begin
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dout <= #FFD {WIDTH{1'b0}};
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dout <= #FFD {WIDTH{1'b0}};
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dout_empty <= #FFD 1'b1;
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dout_empty <= #FFD 1'b1;
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end
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end
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else if (fifo_pop)
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else if (fifo_pop)
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begin
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begin
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dout <= #FFD fifo[ptr_out];
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dout <= #FFD fifo[ptr_out];
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dout_empty <= #FFD 1'b0;
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dout_empty <= #FFD 1'b0;
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end
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end
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always @(posedge clk or posedge reset)
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always @(posedge clk or posedge reset)
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if (reset)
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if (reset)
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ptr_in <= #FFD {DEPTH_BITS{1'b0}};
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ptr_in <= #FFD {DEPTH_BITS{1'b0}};
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else if (fifo_push)
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else if (fifo_push)
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ptr_in <= #FFD ptr_in == LAST_LINE ? 0 : ptr_in + 1'b1;
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ptr_in <= #FFD ptr_in == LAST_LINE ? 0 : ptr_in + 1'b1;
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always @(posedge clk or posedge reset)
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always @(posedge clk or posedge reset)
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if (reset)
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if (reset)
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ptr_out <= #FFD {DEPTH_BITS{1'b0}};
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ptr_out <= #FFD {DEPTH_BITS{1'b0}};
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else if (fifo_pop)
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else if (fifo_pop)
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ptr_out <= #FFD ptr_out == LAST_LINE ? 0 : ptr_out + 1'b1;
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ptr_out <= #FFD ptr_out == LAST_LINE ? 0 : ptr_out + 1'b1;
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always @(posedge clk)
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always @(posedge clk)
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if (fifo_push)
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if (fifo_push)
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fifo[ptr_in] <= #FFD din;
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fifo[ptr_in] <= #FFD din;
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always @(/*AUTOSENSE*/fifo_push or ptr_in)
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always @(/*AUTOSENSE*/fifo_push or ptr_in)
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begin
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begin
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fullness_in = {DEPTH{1'b0}};
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fullness_in = {DEPTH{1'b0}};
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fullness_in[ptr_in] = fifo_push;
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fullness_in[ptr_in] = fifo_push;
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end
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end
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always @(/*AUTOSENSE*/fifo_pop or ptr_out)
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always @(/*AUTOSENSE*/fifo_pop or ptr_out)
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begin
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begin
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fullness_out = {DEPTH{1'b0}};
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fullness_out = {DEPTH{1'b0}};
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fullness_out[ptr_out] = fifo_pop;
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fullness_out[ptr_out] = fifo_pop;
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end
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end
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always @(posedge clk or posedge reset)
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always @(posedge clk or posedge reset)
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if (reset)
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if (reset)
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fullness <= #FFD {DEPTH{1'b0}};
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fullness <= #FFD {DEPTH{1'b0}};
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else if (fifo_push | fifo_pop)
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else if (fifo_push | fifo_pop)
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fullness <= #FFD (fullness & (~fullness_out)) | fullness_in;
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fullness <= #FFD (fullness & (~fullness_out)) | fullness_in;
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assign next = |fullness;
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assign next = |fullness;
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assign fifo_empty = ~next;
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assign fifo_empty = ~next;
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assign empty = fifo_empty & dout_empty;
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assign empty = fifo_empty & dout_empty;
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assign full = SINGLE ? !dout_empty : &fullness;
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assign full = SINGLE ? !dout_empty : &fullness;
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endmodule
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endmodule
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