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[/] [xulalx25soc/] [trunk/] [rtl/] [wbuoutput.v] - Blame information for rev 2

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1 2 dgisselq
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename:    wbuoutput.v
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//
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// Project:     XuLA2 board
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//
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// Purpose:     Converts 36-bit codewords into bytes to be placed on the serial
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//              output port.  The codewords themselves are the results of bus
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//      transactions, which are then (hopefully) compressed within here and
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//      carefully arranged into "lines" for visual viewing (if necessary).
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//
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//
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// Creator:     Dan Gisselquist, Ph.D.
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//              Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of  the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// License:     GPL, v3, as defined and found on www.gnu.org,
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//              http://www.gnu.org/licenses/gpl.html
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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module  wbuoutput(i_clk, i_rst, i_stb, i_codword,
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                i_wb_cyc, i_int, i_bus_busy,
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                o_stb, o_char, i_tx_busy, o_fifo_err);
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        input                   i_clk, i_rst;
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        input                   i_stb;
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        input           [35:0]   i_codword;
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        // Not Idle indicators
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        input                   i_wb_cyc, i_int, i_bus_busy;
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        // Outputs to our UART transmitter
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        output  wire            o_stb;
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        output  wire    [7:0]    o_char;
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        // Miscellaneous I/O: UART transmitter busy, and fifo error
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        input                   i_tx_busy;
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        output  wire            o_fifo_err;
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        wire            fifo_rd, dw_busy, fifo_empty_n, fifo_err;
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        wire    [35:0]   fifo_codword;
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        wire            cw_stb, cw_busy, cp_stb, dw_stb, ln_stb, ln_busy,
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                        cp_busy, byte_busy;
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        wire    [35:0]   cw_codword, cp_word;
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        wire    [6:0]    dw_bits, ln_bits;
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// `define      SKIP_FIFO
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`ifdef  SKIP_FIFO
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        assign  fifo_rd = i_stb;
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        assign  fifo_codword = i_codword;
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        assign  fifo_err = 1'b0;
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`else
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        assign  fifo_rd = (fifo_empty_n)&&(~cw_busy);
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        wbufifo #(36,10) busoutfifo(i_clk, i_rst, i_stb, i_codword,
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                                fifo_rd, fifo_codword, fifo_empty_n,
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                                fifo_err);
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`endif
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        assign  o_fifo_err = fifo_err;
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        wbuidleint      buildcw(i_clk, fifo_rd, fifo_codword,
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                                i_wb_cyc, i_bus_busy, i_int,
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                                cw_stb, cw_codword, cw_busy, cp_busy);
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        // assign       o_dbg = dw_busy; // Always asserted ... ???
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        // assign       o_dbg = { dw_busy, ln_busy, fifo_rd };
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        // Stuck: dw_busy and ln_busy get stuck high after read attempt,
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        //      fifo_rd is low
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        // assign       o_dbg = { fifo_rd, cp_stb, cw_stb };
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        // cw_stb and cp_stb get stuck high after one read
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        //
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        // cw_busy & cw_stb, not cp_stb, but dw_busy
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        //
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// `define      SKIP_COMPRESS
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`ifdef  SKIP_COMPRESS
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        assign  cp_stb = cw_stb;
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        assign  cp_word = cw_codword;
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        assign  cp_busy = dw_busy;
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`else
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        assign  cp_busy = cp_stb;
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        wbucompress     packit(i_clk, cw_stb, cw_codword,
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                                cp_stb, cp_word, dw_busy);
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`endif
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        wbudeword       deword(i_clk, cp_stb, cp_word, ln_busy,
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                                        dw_stb, dw_bits, dw_busy);
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        wbucompactlines linepacker(i_clk, dw_stb, dw_bits,
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                        ln_stb, ln_bits,
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                        (i_wb_cyc||i_bus_busy||fifo_empty_n||cw_busy),
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                        byte_busy, ln_busy);
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        wbusixchar      mkbytes(i_clk, ln_stb, ln_bits, o_stb, o_char, byte_busy, i_tx_busy);
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endmodule

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