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[/] [qaz_libs/] [trunk/] [video/] [src/] [avf_line_buffer.sv] - Blame information for rev 49

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1 49 qaztronic
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2019 Authors and OPENCORES.ORG                 ////
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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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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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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.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.opencores.org/lgpl.shtml                     ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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module
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  avf_line_buffer #(N, U, L, AW)
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  (
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    axis_if axis_in,
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    axis_if axis_out,
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    input   aclk,
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    input   aresetn
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  );
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  // --------------------------------------------------------------------
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  localparam W = (N*8) + U + 1; // tdata + tuser + tlast
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  localparam F = 2; // fanout for the buffer row output
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  // --------------------------------------------------------------------
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  axis_if #(.N(N), .U(U)) row_out[L][F](.*);
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  axis_if #(.N(N), .U(U)) buffer_out[L-1](.*);
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  wire [L-2:0] zero_pad;
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  wire [L-2:0] initialized;
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  wire all_initialized = &initialized;
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  wire enable;
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  wire eof_trailing = row_out[0][0].tready & row_out[0][0].tvalid & row_out[0][0].tuser[2];
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  wire eof_leading = row_out[L-1][0].tready & row_out[L-1][0].tvalid & row_out[L-1][0].tuser[2];
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  // --------------------------------------------------------------------
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  generate
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    for(genvar j = 0; j < L-1; j++)
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    begin: buffer_gen
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      avf_line_buffer_row #(N, W, AW, j)
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        row_i
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        (
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          .axis_in(row_out[j+1][1]),
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          .axis_out(buffer_out[j]),
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          .zero_pad(zero_pad[j]),
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          .initialized(initialized[j]),
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          .*
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        );
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    end
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  endgenerate
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  // --------------------------------------------------------------------
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  generate
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    for(genvar j = 1; j < L-1; j++)
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    begin: middle_fanout_gen
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      axis_fanout #(F)
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        fanout_i(.axis_in(buffer_out[j]), .axis_out(row_out[j]), .*);
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    end
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  endgenerate
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  // --------------------------------------------------------------------
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  axis_fanout #(F) trailing_row_i(.axis_out(row_out[L-1]), .*);
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  axis_alias leading_row_i(buffer_out[0], row_out[0][0]);
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  // --------------------------------------------------------------------
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  enum reg [3:0]
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    {
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      INITIALIZE = 4'b0001,
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      ACTIVE = 4'b0010,
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      // READY       = 4'b0100,
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      FLUSH       = 4'b1000
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    } state, next_state;
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  // --------------------------------------------------------------------
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  always_ff @(posedge aclk)
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    if(~aresetn)
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      state <= INITIALIZE;
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    else
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      state <= next_state;
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  // --------------------------------------------------------------------
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  always_comb
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    case(state)
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      INITIALIZE: if(all_initialized)
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                    next_state = ACTIVE;
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                  else
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                    next_state = INITIALIZE;
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      ACTIVE:     if(eof_leading)
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                    next_state = FLUSH;
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                  else
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                    next_state = ACTIVE;
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      FLUSH:      if(eof_trailing)
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                    next_state = INITIALIZE;
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                  else
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                    next_state = FLUSH;
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      default:      next_state = INITIALIZE;
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    endcase
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  // --------------------------------------------------------------------
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  assign enable = (state == ACTIVE);
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  // --------------------------------------------------------------------
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  wire init = ((state == INITIALIZE) & (next_state == INITIALIZE));
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  wire flush = ((state == FLUSH) & (next_state == FLUSH));
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  axis_if #(.N(N), .U(U)) merge_in[L](.*);
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  generate
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    for(genvar j = 0; j < L; j++)
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    begin: merge_gen
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      axis_alias row_i(row_out[j][0], merge_in[j]);
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    end
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  endgenerate
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  avf_line_buffer_merge #(N, U, L) merge_i(.*);
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// --------------------------------------------------------------------
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endmodule
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