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    /adv_debug_sys/tags/ADS_RELEASE_1_0_0/Hardware/jtag/tap
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Rev 8 → Rev 12

/rtl/verilog/tap_defines.v
0,0 → 1,79
//////////////////////////////////////////////////////////////////////
//// ////
//// tap_defines.v ////
//// ////
//// ////
//// This file is part of the JTAG Test Access Port (TAP) ////
//// http://www.opencores.org/projects/jtag/ ////
//// ////
//// Author(s): ////
//// Igor Mohor (igorm@opencores.org) ////
//// ////
//// ////
//// All additional information is avaliable in the README.txt ////
//// file. ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000 - 2003 Authors ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source is distributed in the hope that it will be ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
//// PURPOSE. See the GNU Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from http://www.opencores.org/lgpl.shtml ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: tap_defines.v,v $
// Revision 1.1.1.1 2008/05/14 12:07:33 Nathan
// Original from OpenCores
//
// Revision 1.3 2004/03/02 17:39:45 mohor
// IDCODE_VALUE changed to Flextronics ID.
//
// Revision 1.2 2004/01/27 10:00:33 mohor
// Unused registers removed.
//
// Revision 1.1 2003/12/23 14:52:14 mohor
// Directory structure changed. New version of TAP.
//
//
//
 
 
// Define IDCODE Value
`define IDCODE_VALUE 32'h149511c3
// 0001 version
// 0100100101010001 part number (IQ)
// 00011100001 manufacturer id (flextronics)
// 1 required by standard
 
// Length of the Instruction register
`define IR_LENGTH 4
 
// Supported Instructions
`define EXTEST 4'b0000
`define SAMPLE_PRELOAD 4'b0001
`define IDCODE 4'b0010
`define DEBUG 4'b1000
`define MBIST 4'b1001
`define BYPASS 4'b1111
 
/rtl/verilog/tap_top.v
0,0 → 1,577
//////////////////////////////////////////////////////////////////////
//// ////
//// tap_top.v ////
//// ////
//// ////
//// This file is part of the JTAG Test Access Port (TAP) ////
//// ////
//// Author(s): ////
//// Igor Mohor (igorm@opencores.org) ////
//// Nathan Yawn (nathan.yawn@opencores.org) ////
//// ////
//// ////
//// All additional information is avaliable in the jtag.pdf ////
//// file. ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000 - 2008 Authors ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source is distributed in the hope that it will be ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
//// PURPOSE. See the GNU Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from http://www.opencores.org/lgpl.shtml ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: tap_top.v,v $
// Revision 1.4 2009/05/17 20:54:38 Nathan
// Changed email address to opencores.org
//
// Revision 1.3 2008/06/18 18:45:07 Nathan
// Improved reset slightly. Cleanup.
//
//
// Revision 1.2 2008/05/14 13:13:24 Nathan
// Rewrote TAP FSM in canonical form, for readability. Switched
// from one-hot to binary encoding. Made reset signal active-
// low, per JTAG spec. Removed FF chain for 5 TMS reset - reset
// done in Test Logic Reset mode. Added test_logic_reset_o and
// run_test_idle_o signals. Removed double registers from IR data
// path. Unified the registers at the output of each data register
// to a single shared FF.
//
// Revision 1.6 2004/01/27 10:00:33 mohor
// Unused registers removed.
//
// Revision 1.5 2004/01/18 09:27:39 simons
// Blocking non blocking assignmenst fixed.
//
// Revision 1.4 2004/01/17 17:37:44 mohor
// capture_dr_o added to ports.
//
// Revision 1.3 2004/01/14 13:50:56 mohor
// 5 consecutive TMS=1 causes reset of TAP.
//
// Revision 1.2 2004/01/08 10:29:44 mohor
// Control signals for tdo_pad_o mux are changed to negedge.
//
// Revision 1.1 2003/12/23 14:52:14 mohor
// Directory structure changed. New version of TAP.
//
// Revision 1.10 2003/10/23 18:08:01 mohor
// MBIST chain connection fixed.
//
// Revision 1.9 2003/10/23 16:17:02 mohor
// CRC logic changed.
//
// Revision 1.8 2003/10/21 09:48:31 simons
// Mbist support added.
//
// Revision 1.7 2002/11/06 14:30:10 mohor
// Trst active high. Inverted on higher layer.
//
// Revision 1.6 2002/04/22 12:55:56 mohor
// tdo_padoen_o changed to tdo_padoe_o. Signal is active high.
//
// Revision 1.5 2002/03/26 14:23:38 mohor
// Signal tdo_padoe_o changed back to tdo_padoen_o.
//
// Revision 1.4 2002/03/25 13:16:15 mohor
// tdo_padoen_o changed to tdo_padoe_o. Signal was always active high, just
// not named correctly.
//
// Revision 1.3 2002/03/12 14:30:05 mohor
// Few outputs for boundary scan chain added.
//
// Revision 1.2 2002/03/12 10:31:53 mohor
// tap_top and dbg_top modules are put into two separate modules. tap_top
// contains only tap state machine and related logic. dbg_top contains all
// logic necessery for debugging.
//
// Revision 1.1 2002/03/08 15:28:16 mohor
// Structure changed. Hooks for jtag chain added.
//
//
//
//
 
`include "tap_defines.v"
 
// Top module
module tap_top(
// JTAG pads
tms_pad_i,
tck_pad_i,
trstn_pad_i,
tdi_pad_i,
tdo_pad_o,
tdo_padoe_o,
 
// TAP states
test_logic_reset_o,
run_test_idle_o,
shift_dr_o,
pause_dr_o,
update_dr_o,
capture_dr_o,
// Select signals for boundary scan or mbist
extest_select_o,
sample_preload_select_o,
mbist_select_o,
debug_select_o,
// TDO signal that is connected to TDI of sub-modules.
tdo_o,
// TDI signals from sub-modules
debug_tdi_i, // from debug module
bs_chain_tdi_i, // from Boundary Scan Chain
mbist_tdi_i // from Mbist Chain
);
 
 
// JTAG pins
input tms_pad_i; // JTAG test mode select pad
input tck_pad_i; // JTAG test clock pad
input trstn_pad_i; // JTAG test reset pad
input tdi_pad_i; // JTAG test data input pad
output tdo_pad_o; // JTAG test data output pad
output tdo_padoe_o; // Output enable for JTAG test data output pad
 
// TAP states
output test_logic_reset_o;
output run_test_idle_o;
output shift_dr_o;
output pause_dr_o;
output update_dr_o;
output capture_dr_o;
 
// Select signals for boundary scan or mbist
output extest_select_o;
output sample_preload_select_o;
output mbist_select_o;
output debug_select_o;
 
// TDO signal that is connected to TDI of sub-modules.
output tdo_o;
 
// TDI signals from sub-modules
input debug_tdi_i; // from debug module
input bs_chain_tdi_i; // from Boundary Scan Chain
input mbist_tdi_i; // from Mbist Chain
 
// Wires which depend on the state of the TAP FSM
reg test_logic_reset;
reg run_test_idle;
reg select_dr_scan;
reg capture_dr;
reg shift_dr;
reg exit1_dr;
reg pause_dr;
reg exit2_dr;
reg update_dr;
reg select_ir_scan;
reg capture_ir;
reg shift_ir;
reg exit1_ir;
reg pause_ir;
reg exit2_ir;
reg update_ir;
 
// Wires which depend on the current value in the IR
reg extest_select;
reg sample_preload_select;
reg idcode_select;
reg mbist_select;
reg debug_select;
reg bypass_select;
 
// TDO and enable
reg tdo_pad_o;
reg tdo_padoe_o;
 
assign tdo_o = tdi_pad_i;
 
assign test_logic_reset_o = test_logic_reset;
assign run_test_idle_o = run_test_idle;
assign shift_dr_o = shift_dr;
assign pause_dr_o = pause_dr;
assign update_dr_o = update_dr;
assign capture_dr_o = capture_dr;
 
assign extest_select_o = extest_select;
assign sample_preload_select_o = sample_preload_select;
assign mbist_select_o = mbist_select;
assign debug_select_o = debug_select;
 
 
/**********************************************************************************
* *
* TAP State Machine: Fully JTAG compliant *
* *
**********************************************************************************/
// Definition of machine state values. We could one-hot encode this, and use 16
// registers, but this uses binary encoding for the minimum of 4 DFF's instead.
`define STATE_test_logic_reset 4'hF
`define STATE_run_test_idle 4'hC
`define STATE_select_dr_scan 4'h7
`define STATE_capture_dr 4'h6
`define STATE_shift_dr 4'h2
`define STATE_exit1_dr 4'h1
`define STATE_pause_dr 4'h3
`define STATE_exit2_dr 4'h0
`define STATE_update_dr 4'h5
`define STATE_select_ir_scan 4'h4
`define STATE_capture_ir 4'hE
`define STATE_shift_ir 4'hA
`define STATE_exit1_ir 4'h9
`define STATE_pause_ir 4'hB
`define STATE_exit2_ir 4'h8
`define STATE_update_ir 4'hD
 
reg [3:0] TAP_state = `STATE_test_logic_reset; // current state of the TAP controller
reg [3:0] next_TAP_state; // state TAP will take at next rising TCK, combinational signal
 
// sequential part of the FSM
always @ (posedge tck_pad_i or negedge trstn_pad_i)
begin
if(trstn_pad_i == 0)
TAP_state = `STATE_test_logic_reset;
else
TAP_state = next_TAP_state;
end
 
 
// Determination of next state; purely combinatorial
always @ (TAP_state or tms_pad_i)
begin
case(TAP_state)
`STATE_test_logic_reset:
begin
if(tms_pad_i) next_TAP_state = `STATE_test_logic_reset;
else next_TAP_state = `STATE_run_test_idle;
end
`STATE_run_test_idle:
begin
if(tms_pad_i) next_TAP_state = `STATE_select_dr_scan;
else next_TAP_state = `STATE_run_test_idle;
end
`STATE_select_dr_scan:
begin
if(tms_pad_i) next_TAP_state = `STATE_select_ir_scan;
else next_TAP_state = `STATE_capture_dr;
end
`STATE_capture_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit1_dr;
else next_TAP_state = `STATE_shift_dr;
end
`STATE_shift_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit1_dr;
else next_TAP_state = `STATE_shift_dr;
end
`STATE_exit1_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_update_dr;
else next_TAP_state = `STATE_pause_dr;
end
`STATE_pause_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit2_dr;
else next_TAP_state = `STATE_pause_dr;
end
`STATE_exit2_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_update_dr;
else next_TAP_state = `STATE_shift_dr;
end
`STATE_update_dr:
begin
if(tms_pad_i) next_TAP_state = `STATE_select_dr_scan;
else next_TAP_state = `STATE_run_test_idle;
end
`STATE_select_ir_scan:
begin
if(tms_pad_i) next_TAP_state = `STATE_test_logic_reset;
else next_TAP_state = `STATE_capture_ir;
end
`STATE_capture_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit1_ir;
else next_TAP_state = `STATE_shift_ir;
end
`STATE_shift_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit1_ir;
else next_TAP_state = `STATE_shift_ir;
end
`STATE_exit1_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_update_ir;
else next_TAP_state = `STATE_pause_ir;
end
`STATE_pause_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_exit2_ir;
else next_TAP_state = `STATE_pause_ir;
end
`STATE_exit2_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_update_ir;
else next_TAP_state = `STATE_shift_ir;
end
`STATE_update_ir:
begin
if(tms_pad_i) next_TAP_state = `STATE_select_dr_scan;
else next_TAP_state = `STATE_run_test_idle;
end
default: next_TAP_state = `STATE_test_logic_reset; // can't actually happen
endcase
end
 
 
// Outputs of state machine, pure combinatorial
always @ (TAP_state)
begin
// Default everything to 0, keeps the case statement simple
test_logic_reset = 1'b0;
run_test_idle = 1'b0;
select_dr_scan = 1'b0;
capture_dr = 1'b0;
shift_dr = 1'b0;
exit1_dr = 1'b0;
pause_dr = 1'b0;
exit2_dr = 1'b0;
update_dr = 1'b0;
select_ir_scan = 1'b0;
capture_ir = 1'b0;
shift_ir = 1'b0;
exit1_ir = 1'b0;
pause_ir = 1'b0;
exit2_ir = 1'b0;
update_ir = 1'b0;
 
case(TAP_state)
`STATE_test_logic_reset: test_logic_reset = 1'b1;
`STATE_run_test_idle: run_test_idle = 1'b1;
`STATE_select_dr_scan: select_dr_scan = 1'b1;
`STATE_capture_dr: capture_dr = 1'b1;
`STATE_shift_dr: shift_dr = 1'b1;
`STATE_exit1_dr: exit1_dr = 1'b1;
`STATE_pause_dr: pause_dr = 1'b1;
`STATE_exit2_dr: exit2_dr = 1'b1;
`STATE_update_dr: update_dr = 1'b1;
`STATE_select_ir_scan: select_ir_scan = 1'b1;
`STATE_capture_ir: capture_ir = 1'b1;
`STATE_shift_ir: shift_ir = 1'b1;
`STATE_exit1_ir: exit1_ir = 1'b1;
`STATE_pause_ir: pause_ir = 1'b1;
`STATE_exit2_ir: exit2_ir = 1'b1;
`STATE_update_ir: update_ir = 1'b1;
default: ;
endcase
end
 
/**********************************************************************************
* *
* End: TAP State Machine *
* *
**********************************************************************************/
 
 
 
/**********************************************************************************
* *
* jtag_ir: JTAG Instruction Register *
* *
**********************************************************************************/
reg [`IR_LENGTH-1:0] jtag_ir; // Instruction register
reg [`IR_LENGTH-1:0] latched_jtag_ir; //, latched_jtag_ir_neg;
wire instruction_tdo;
 
always @ (posedge tck_pad_i or negedge trstn_pad_i)
begin
if(trstn_pad_i == 0)
jtag_ir[`IR_LENGTH-1:0] <= #1 `IR_LENGTH'b0;
else if (test_logic_reset == 1)
jtag_ir[`IR_LENGTH-1:0] <= #1 `IR_LENGTH'b0;
else if(capture_ir)
jtag_ir <= #1 4'b0101; // This value is fixed for easier fault detection
else if(shift_ir)
jtag_ir[`IR_LENGTH-1:0] <= #1 {tdi_pad_i, jtag_ir[`IR_LENGTH-1:1]};
end
 
assign instruction_tdo = jtag_ir[0]; // This is latched on a negative TCK edge after the output MUX
 
// Updating jtag_ir (Instruction Register)
// jtag_ir should be latched on FALLING EDGE of TCK when capture_ir == 1
always @ (negedge tck_pad_i or negedge trstn_pad_i)
begin
if(trstn_pad_i == 0)
latched_jtag_ir <=#1 `IDCODE; // IDCODE selected after reset
else if (test_logic_reset)
latched_jtag_ir <=#1 `IDCODE; // IDCODE selected after reset
else if(update_ir)
latched_jtag_ir <=#1 jtag_ir;
end
 
/**********************************************************************************
* *
* End: jtag_ir *
* *
**********************************************************************************/
 
 
 
/**********************************************************************************
* *
* idcode logic *
* *
**********************************************************************************/
reg [31:0] idcode_reg;
wire idcode_tdo;
 
always @ (posedge tck_pad_i or negedge trstn_pad_i)
begin
if(trstn_pad_i == 0)
idcode_reg <=#1 `IDCODE_VALUE; // IDCODE selected after reset
else if (test_logic_reset)
idcode_reg <=#1 `IDCODE_VALUE; // IDCODE selected after reset
else if(idcode_select & capture_dr)
idcode_reg <= #1 `IDCODE_VALUE;
else if(idcode_select & shift_dr)
idcode_reg <= #1 {tdi_pad_i, idcode_reg[31:1]};
 
end
 
assign idcode_tdo = idcode_reg[0]; // This is latched on a negative TCK edge after the output MUX
 
/**********************************************************************************
* *
* End: idcode logic *
* *
**********************************************************************************/
 
 
/**********************************************************************************
* *
* Bypass logic *
* *
**********************************************************************************/
wire bypassed_tdo;
reg bypass_reg; // This is a 1-bit register
 
always @ (posedge tck_pad_i or negedge trstn_pad_i)
begin
if (trstn_pad_i == 0)
bypass_reg <= #1 1'b0;
else if (test_logic_reset == 1)
bypass_reg <= #1 1'b0;
else if (bypass_select & capture_dr)
bypass_reg<=#1 1'b0;
else if(bypass_select & shift_dr)
bypass_reg<=#1 tdi_pad_i;
end
 
assign bypassed_tdo = bypass_reg; // This is latched on a negative TCK edge after the output MUX
 
/**********************************************************************************
* *
* End: Bypass logic *
* *
**********************************************************************************/
 
 
/**********************************************************************************
* *
* Selecting active data register *
* *
**********************************************************************************/
always @ (latched_jtag_ir)
begin
extest_select = 1'b0;
sample_preload_select = 1'b0;
idcode_select = 1'b0;
mbist_select = 1'b0;
debug_select = 1'b0;
bypass_select = 1'b0;
 
case(latched_jtag_ir) /* synthesis parallel_case */
`EXTEST: extest_select = 1'b1; // External test
`SAMPLE_PRELOAD: sample_preload_select = 1'b1; // Sample preload
`IDCODE: idcode_select = 1'b1; // ID Code
`MBIST: mbist_select = 1'b1; // Mbist test
`DEBUG: debug_select = 1'b1; // Debug
`BYPASS: bypass_select = 1'b1; // BYPASS
default: bypass_select = 1'b1; // BYPASS
endcase
end
 
 
/**********************************************************************************
* *
* Multiplexing TDO data *
* *
**********************************************************************************/
reg tdo_mux_out; // really just a wire
 
always @ (shift_ir or instruction_tdo or latched_jtag_ir or idcode_tdo or
debug_tdi_i or bs_chain_tdi_i or mbist_tdi_i or bypassed_tdo or
bs_chain_tdi_i)
begin
if(shift_ir)
tdo_mux_out = instruction_tdo;
else
begin
case(latched_jtag_ir) // synthesis parallel_case
`IDCODE: tdo_mux_out = idcode_tdo; // Reading ID code
`DEBUG: tdo_mux_out = debug_tdi_i; // Debug
`SAMPLE_PRELOAD: tdo_mux_out = bs_chain_tdi_i; // Sampling/Preloading
`EXTEST: tdo_mux_out = bs_chain_tdi_i; // External test
`MBIST: tdo_mux_out = mbist_tdi_i; // Mbist test
default: tdo_mux_out = bypassed_tdo; // BYPASS instruction
endcase
end
end
 
 
// TDO changes state at negative edge of TCK
always @ (negedge tck_pad_i)
begin
tdo_pad_o = tdo_mux_out;
end
 
 
// Tristate control for tdo_pad_o pin
always @ (posedge tck_pad_i)
begin
tdo_padoe_o <= #1 shift_ir | shift_dr;
end
/**********************************************************************************
* *
* End: Multiplexing TDO data *
* *
**********************************************************************************/
 
endmodule
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doc/src/system_block_diagram.odg Property changes : Added: svn:mime-type ## -0,0 +1 ## +application/octet-stream \ No newline at end of property Index: doc/gpl-2.0.txt =================================================================== --- doc/gpl-2.0.txt (nonexistent) +++ doc/gpl-2.0.txt (revision 12) @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must show them these terms so they know their +rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + Finally, any free program is threatened constantly by software +patents. We wish to avoid the danger that redistributors of a free +program will individually obtain patent licenses, in effect making the +program proprietary. To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. You may modify your copy or copies of the Program or any portion +of it, thus forming a work based on the Program, and copy and +distribute such modifications or work under the terms of Section 1 +above, provided that you also meet all of these conditions: + + a) You must cause the modified files to carry prominent notices + stating that you changed the files and the date of any change. + + b) You must cause any work that you distribute or publish, that in + whole or in part contains or is derived from the Program or any + part thereof, to be licensed as a whole at no charge to all third + parties under the terms of this License. + + c) If the modified program normally reads commands interactively + when run, you must cause it, when started running for such + interactive use in the most ordinary way, to print or display an + announcement including an appropriate copyright notice and a + notice that there is no warranty (or else, saying that you provide + a warranty) and that users may redistribute the program under + these conditions, and telling the user how to view a copy of this + License. (Exception: if the Program itself is interactive but + does not normally print such an announcement, your work based on + the Program is not required to print an announcement.) + +These requirements apply to the modified work as a whole. If +identifiable sections of that work are not derived from the Program, +and can be reasonably considered independent and separate works in +themselves, then this License, and its terms, do not apply to those +sections when you distribute them as separate works. But when you +distribute the same sections as part of a whole which is a work based +on the Program, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Program. + +In addition, mere aggregation of another work not based on the Program +with the Program (or with a work based on the Program) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may copy and distribute the Program (or a work based on it, +under Section 2) in object code or executable form under the terms of +Sections 1 and 2 above provided that you also do one of the following: + + a) Accompany it with the complete corresponding machine-readable + source code, which must be distributed under the terms of Sections + 1 and 2 above on a medium customarily used for software interchange; or, + + b) Accompany it with a written offer, valid for at least three + years, to give any third party, for a charge no more than your + cost of physically performing source distribution, a complete + machine-readable copy of the corresponding source code, to be + distributed under the terms of Sections 1 and 2 above on a medium + customarily used for software interchange; or, + + c) Accompany it with the information you received as to the offer + to distribute corresponding source code. (This alternative is + allowed only for noncommercial distribution and only if you + received the program in object code or executable form with such + an offer, in accord with Subsection b above.) + +The source code for a work means the preferred form of the work for +making modifications to it. For an executable work, complete source +code means all the source code for all modules it contains, plus any +associated interface definition files, plus the scripts used to +control compilation and installation of the executable. However, as a +special exception, the source code distributed need not include +anything that is normally distributed (in either source or binary +form) with the major components (compiler, kernel, and so on) of the +operating system on which the executable runs, unless that component +itself accompanies the executable. + +If distribution of executable or object code is made by offering +access to copy from a designated place, then offering equivalent +access to copy the source code from the same place counts as +distribution of the source code, even though third parties are not +compelled to copy the source along with the object code. + + 4. You may not copy, modify, sublicense, or distribute the Program +except as expressly provided under this License. Any attempt +otherwise to copy, modify, sublicense or distribute the Program is +void, and will automatically terminate your rights under this License. +However, parties who have received copies, or rights, from you under +this License will not have their licenses terminated so long as such +parties remain in full compliance. + + 5. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Program or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Program (or any work based on the +Program), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Program or works based on it. + + 6. Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the +original licensor to copy, distribute or modify the Program subject to +these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties to +this License. + + 7. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Program at all. For example, if a patent +license would not permit royalty-free redistribution of the Program by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Program. + +If any portion of this section is held invalid or unenforceable under +any particular circumstance, the balance of the section is intended to +apply and the section as a whole is intended to apply in other +circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system, which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 8. If the distribution and/or use of the Program is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Program under this License +may add an explicit geographical distribution limitation excluding +those countries, so that distribution is permitted only in or among +countries not thus excluded. In such case, this License incorporates +the limitation as if written in the body of this License. + + 9. The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; 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 2 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 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. 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