// $Id: lb_fifo_5cell.v,v 1.1 2006-02-26 17:11:49-08 mzeng Exp $/*******************************************************************************
//
//  Author:    Hongjian Ye
//  Filename:  lb_fifo_5cell.v
//  Modified:  02/28/00
//
//  Description: Data FIFO with 5 buffer Cells;
//
//  Modification History:
//
//  Date      Who      Description of change
//  ------------------------------------------------------------------------
//  02/00/00  Hongjian
//
//  ------------------------------------------------------------------------
//                   Copyright (c) 2000 Nexware Corp.
//                   All rights reserved
*******************************************************************************/
 
module  lb_fifo_5cell
    (   sys_clk,
        sys_rst_n,
 
        data_in,
        data_write,
 
        data_out,
        data_read,
 
        full_cell0,
        full_cell1,
        full_cell2,
        full_cell3,
        full_cell4
    );
 
    parameter   WIDTH = 8;
    parameter   D     = 2;
 
////////////////////////////////////////
////    Global signals
////////////////////////////////////////
    input                   sys_clk;        // Internal system clk;
    input                   sys_rst_n;        // synopsys sync_set_reset "sys_rst_n"
 
    input    [WIDTH-1:0]    data_in;        // Data that is pushing in;
    output   [WIDTH-1:0]    data_out;       // Data that is ready for read;;
 
    input                   data_read;      // Read from FIFO;
    input                   data_write;     // Write to FIFO;
 
    output                  full_cell0;
    output                  full_cell1;
    output                  full_cell2;
    output                  full_cell3;
    output                  full_cell4;
 
    wire    [WIDTH-1:0]     data_cell0;
    wire    [WIDTH-1:0]     data_cell1;
    wire    [WIDTH-1:0]     data_cell2;
    wire    [WIDTH-1:0]     data_cell3;
    wire    [WIDTH-1:0]     data_cell4;
    wire    [WIDTH-1:0]     data_cell5;
 
    wire                    full_cell5;
 
lb_fifo_cell #(WIDTH,D) cell0
    (  .sys_clk(sys_clk),
       .sys_rst_n(sys_rst_n),
 
       .data_in(data_in[WIDTH-1:0]),
       .data_write(data_write),
 
       .next_data(data_cell1[WIDTH-1:0]),
       .next_full(full_cell1),
       .last_full(1'b1),
 
       .data_out(data_out[WIDTH-1:0]),
       .data_read(data_read),
 
       .full(full_cell0)
    );

lb_fifo_cell #(WIDTH,D) cell1
    (  .sys_clk(sys_clk),
       .sys_rst_n(sys_rst_n),
 
       .data_in(data_in[WIDTH-1:0]),
       .data_write(data_write),
 
       .next_data(data_cell2[WIDTH-1:0]),
       .next_full(full_cell2),
       .last_full(full_cell0),
 
       .data_out(data_cell1[WIDTH-1:0]),
       .data_read(data_read),
 
       .full(full_cell1)
    );
 
lb_fifo_cell #(WIDTH,D) cell2
    (  .sys_clk(sys_clk),
       .sys_rst_n(sys_rst_n),
 
       .data_in(data_in[WIDTH-1:0]),
       .data_write(data_write),
 
       .next_data(data_cell3[WIDTH-1:0]),
       .next_full(full_cell3),
       .last_full(full_cell1),
 
       .data_out(data_cell2[WIDTH-1:0]),
       .data_read(data_read),
 
       .full(full_cell2)
    );
 
lb_fifo_cell #(WIDTH,D) cell3
    (  .sys_clk(sys_clk),
       .sys_rst_n(sys_rst_n),
 
       .data_in(data_in[WIDTH-1:0]),
       .data_write(data_write),
 
       .next_data(data_cell4[WIDTH-1:0]),
       .next_full(full_cell4),
       .last_full(full_cell2),
 
       .data_out(data_cell3[WIDTH-1:0]),
       .data_read(data_read),
 
       .full(full_cell3)
    );
 
lb_fifo_cell #(WIDTH,D) cell4
    (  .sys_clk(sys_clk),
       .sys_rst_n(sys_rst_n),
 
       .data_in(data_in[WIDTH-1:0]),
       .data_write(data_write),
 
       .next_data(data_cell5[WIDTH-1:0]),
       .next_full(full_cell5),
       .last_full(full_cell3),
 
       .data_out(data_cell4[WIDTH-1:0]),
       .data_read(data_read),
 
       .full(full_cell4)
    );

    assign  data_cell5[WIDTH-1:0] = {WIDTH{1'b0}};
    assign  full_cell5 = 1'b0;

endmodule