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[/] [xulalx25soc/] [trunk/] [rtl/] [wbusixchar.v] - Rev 70
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/////////////////////////////////////////////////////////////////////////// // // Filename: wbusixchar.v // // Project: XuLA2 board // // Purpose: Supports a conversion from a six digit bus to a printable // ASCII character representing those six bits. The encoding is // as follows: // // 0-9 -> 0-9 // A-Z -> 10-35 // a-z -> 36-61 // @ -> 62 // % -> 63 // // Note that decoding is stateless, yet requires one clock. // // // Creator: Dan Gisselquist, Ph.D. // Gisselquist Technology, LLC // /////////////////////////////////////////////////////////////////////////// // // Copyright (C) 2015, Gisselquist Technology, LLC // // This program is free software (firmware): you can redistribute it and/or // modify it under the terms of the GNU General Public License as published // by the Free Software Foundation, either version 3 of the License, or (at // your option) any later version. // // This program is distributed in the hope that it will be useful, but WITHOUT // ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // License: GPL, v3, as defined and found on www.gnu.org, // http://www.gnu.org/licenses/gpl.html // // /////////////////////////////////////////////////////////////////////////// // // // module wbusixchar(i_clk, i_stb, i_bits, o_stb, o_char, o_busy, i_busy); input i_clk; input i_stb; input [6:0] i_bits; output reg o_stb; output reg [7:0] o_char; output wire o_busy; input i_busy; initial o_char = 8'h00; always @(posedge i_clk) if ((i_stb)&&(~o_busy)) begin if (i_bits[6]) o_char <= 8'h0a; else if (i_bits[5:0] <= 6'h09) // A digit, WORKS o_char <= "0" + { 4'h0, i_bits[3:0] }; else if (i_bits[5:0] <= 6'd35) // Upper case o_char <= "A" + { 2'h0, i_bits[5:0] } - 8'd10; // -'A'+10 else if (i_bits[5:0] <= 6'd61) o_char <= "a" + { 2'h0, i_bits[5:0] } - 8'd36;// -'a'+(10+26) else if (i_bits[5:0] == 6'd62) // An '@' sign o_char <= 8'h40; else // if (i_char == 6'h63) // A '%' sign o_char <= 8'h25; end always @(posedge i_clk) if ((o_stb)&&(~i_busy)) o_stb <= 1'b0; else if ((i_stb)&&(~o_stb)) o_stb <= 1'b1; assign o_busy = o_stb; endmodule
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