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[/] [openarty/] [trunk/] [rtl/] [wbusixchar.v] - Blame information for rev 53

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////////////////////////////////////////////////////////////////////////////////
//
//
// Filename:    wbusixchar.v
//
// Project:     FPGA library
//
// 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) 2015-2016, 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
 

Line No.	Rev	Author	Line
1	30	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
2	3	dgisselq	`//`
3			`//`
4			`// Filename: wbusixchar.v`
5			`//`
6			`// Project: FPGA library`
7			`//`
8			`// Purpose: Supports a conversion from a six digit bus to a printable`
9			`// ASCII character representing those six bits. The encoding is`
10			`// as follows:`
11			`//`
12			`// 0-9 -> 0-9`
13			`// A-Z -> 10-35`
14			`// a-z -> 36-61`
15			`// @ -> 62`
16			`// % -> 63`
17			`//`
18			`// Note that decoding is stateless, yet requires one clock.`
19			`//`
20			`//`
21			`// Creator: Dan Gisselquist, Ph.D.`
22			`// Gisselquist Technology, LLC`
23			`//`
24	30	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
25	3	dgisselq	`//`
26			`// Copyright (C) 2015-2016, Gisselquist Technology, LLC`
27			`//`
28			`// This program is free software (firmware): you can redistribute it and/or`
29			`// modify it under the terms of the GNU General Public License as published`
30			`// by the Free Software Foundation, either version 3 of the License, or (at`
31			`// your option) any later version.`
32			`//`
33			`// This program is distributed in the hope that it will be useful, but WITHOUT`
34			`// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or`
35			`// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
36			`// for more details.`
37			`//`
38			`// License: GPL, v3, as defined and found on www.gnu.org,`
39			`// http://www.gnu.org/licenses/gpl.html`
40			`//`
41			`//`
42	30	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
43	3	dgisselq	`//`
44			`//`
45			`//`
46			`module wbusixchar(i_clk, i_stb, i_bits, o_stb, o_char, o_busy, i_busy);`
47			`input i_clk;`
48			`input i_stb;`
49			`input [6:0] i_bits;`
50			`output reg o_stb;`
51			`output reg [7:0] o_char;`
52			`output wire o_busy;`
53			`input i_busy;`
54
55			`initial o_char = 8'h00;`
56			`always @(posedge i_clk)`
57			`if ((i_stb)&&(~o_busy))`
58			`begin`
59			`if (i_bits[6])`
60			`o_char <= 8'h0a;`
61			`else if (i_bits[5:0] <= 6'h09) // A digit, WORKS`
62			`o_char <= "0" + { 4'h0, i_bits[3:0] };`
63			`else if (i_bits[5:0] <= 6'd35) // Upper case`
64			`o_char <= "A" + { 2'h0, i_bits[5:0] } - 8'd10; // -'A'+10`
65			`else if (i_bits[5:0] <= 6'd61)`
66			`o_char <= "a" + { 2'h0, i_bits[5:0] } - 8'd36;// -'a'+(10+26)`
67			`else if (i_bits[5:0] == 6'd62) // An '@' sign`
68			`o_char <= 8'h40;`
69			`else // if (i_char == 6'h63) // A '%' sign`
70			`o_char <= 8'h25;`
71			`end`
72
73			`always @(posedge i_clk)`
74			`if ((o_stb)&&(~i_busy))`
75			`o_stb <= 1'b0;`
76			`else if ((i_stb)&&(~o_stb))`
77			`o_stb <= 1'b1;`
78
79			`assign o_busy = o_stb;`
80
81			`endmodule`
82

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[/] [openarty/] [trunk/] [rtl/] [wbusixchar.v] - Blame information for rev 53