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132 lines
3.6 KiB
Verilog
132 lines
3.6 KiB
Verilog
/* Model for xilinx async fifo*/
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module fifo_async_104x16
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(/*AUTOARG*/
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// Outputs
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full, dout, empty, valid,
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// Inputs
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wr_rst, rd_rst, wr_clk, rd_clk, wr_en, din, rd_en
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);
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parameter DW = 104;//104 wide
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parameter AW = 4; //16 entries
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//##########
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//# RESET/CLOCK
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//##########
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input wr_rst; //asynchronous reset
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input rd_rst; //asynchronous reset
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input wr_clk; //write clock
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input rd_clk; //read clock
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//##########
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//# FIFO WRITE
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//##########
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input wr_en;
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input [DW-1:0] din;
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output full;
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//###########
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//# FIFO READ
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//###########
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input rd_en;
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output [DW-1:0] dout;
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output empty;
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output valid;
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//Wires
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wire [DW/8-1:0] wr_vec;
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wire [AW:0] wr_rd_gray_pointer;
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wire [AW:0] rd_wr_gray_pointer;
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wire [AW:0] wr_gray_pointer;
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wire [AW:0] rd_gray_pointer;
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wire [AW-1:0] rd_addr;
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wire [AW-1:0] wr_addr;
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reg valid;
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assign wr_vec[DW/8-1:0] = {(DW/8){wr_en}};
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//Valid data at output
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always @ (posedge rd_clk or posedge rd_rst)
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if(rd_rst)
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valid <=1'b0;
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else
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valid <= rd_en;
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memory_dp #(.DW(DW),.AW(AW)) memory_dp (
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// Outputs
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.rd_data (dout[DW-1:0]),
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// Inputs
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.wr_clk (wr_clk),
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.wr_en (wr_vec[DW/8-1:0]),
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.wr_addr (wr_addr[AW-1:0]),
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.wr_data (din[DW-1:0]),
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.rd_clk (rd_clk),
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.rd_en (rd_en),
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.rd_addr (rd_addr[AW-1:0]));
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//Read State Machine
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fifo_empty_block #(.AW(AW)) fifo_empty_block(
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// Outputs
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.rd_fifo_empty (empty),
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.rd_addr (rd_addr[AW-1:0]),
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.rd_gray_pointer(rd_gray_pointer[AW:0]),
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// Inputs
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.reset (rd_rst),
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.rd_clk (rd_clk),
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.rd_wr_gray_pointer(rd_wr_gray_pointer[AW:0]),
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.rd_read (rd_en));
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//Write State Machine
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fifo_full_block #(.AW(AW)) fifo_full_block(
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// Outputs
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.wr_fifo_prog_full(prog_full),
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.wr_fifo_full (full),
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.wr_addr (wr_addr[AW-1:0]),
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.wr_gray_pointer (wr_gray_pointer[AW:0]),
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// Inputs
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.reset (wr_rst),
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.wr_clk (wr_clk),
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.wr_rd_gray_pointer(wr_rd_gray_pointer[AW:0]),
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.wr_write (wr_en));
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synchronizer #(.DW(AW+1)) rd2wr_sync (.out (wr_rd_gray_pointer[AW:0]),
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.in (rd_gray_pointer[AW:0]),
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.reset (wr_rst),
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.clk (wr_clk));
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synchronizer #(.DW(AW+1)) wr2rd_sync (.out (rd_wr_gray_pointer[AW:0]),
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.in (wr_gray_pointer[AW:0]),
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.reset (rd_rst),
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.clk (rd_clk));
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endmodule // fifo_async
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// Local Variables:
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// verilog-library-directories:("." "../../common/hdl")
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// End:
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/*
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Copyright (C) 2013 Adapteva, Inc.
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Contributed by Andreas Olofsson, Roman Trogan <support@adapteva.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program (see the file COPYING). If not, see
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<http://www.gnu.org/licenses/>.
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*/
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