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[/] [gpio/] [tags/] [rel_1/] [bench/] [verilog/] [tb_tasks.v] - Blame information for rev 67

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  GPIO Testbench Tasks                                        ////
////                                                              ////
////  This file is part of the GPIO project                       ////
////  http://www.opencores.org/cores/gpio/                        ////
////                                                              ////
////  Description                                                 ////
////  Testbench tasks.                                            ////
////                                                              ////
////  To Do:                                                      ////
////   Nothing                                                    ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// 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: not supported by cvs2svn $
// Revision 1.5  2001/12/25 17:12:28  lampret
// Added RGPIO_INTS.
//
// Revision 1.4  2001/11/15 02:26:32  lampret
// Updated timing and fixed some typing errors.
//
// Revision 1.3  2001/09/18 16:37:55  lampret
// Changed VCD output location.
//
// Revision 1.2  2001/09/18 15:43:27  lampret
// Changed gpio top level into gpio_top. Changed defines.v into gpio_defines.v.
//
// Revision 1.1  2001/08/21 21:39:27  lampret
// Changed directory structure, port names and drfines.
//
// Revision 1.2  2001/07/14 20:37:23  lampret
// Test bench improvements.
//
// Revision 1.1  2001/06/05 07:45:22  lampret
// Added initial RTL and test benches. There are still some issues with these files.
//
//
 
`include "timescale.v"
`include "gpio_defines.v"
`include "tb_defines.v"
 
module tb_tasks;
 
integer nr_failed;
integer ints_disabled;
integer ints_working;
integer local_errs;
 
parameter sh_addr = `GPIO_ADDRLH+1;
 
//
// Count/report failed tests
//
task failed;
begin
        $display("FAILED !!!");
        nr_failed = nr_failed + 1;
end
endtask
 
//
// Set RGPIO_OUT register
//
task setout;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_OUT<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_OE register
//
task setoe;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_OE<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_INTE register
//
task setinte;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_INTE<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_PTRIG register
//
task setptrig;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_PTRIG<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_AUX register
//
task setaux;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_AUX<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_CTRL register
//
task setctrl;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_CTRL<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Set RGPIO_INTS register
//
task setints;
input   [31:0] val;
 
begin
        #100 tb_top.wb_master.wr(`GPIO_RGPIO_INTS<<sh_addr, val, 4'b1111);
end
 
endtask
 
//
// Display RGPIO_IN register
//
task showin;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_IN<<sh_addr, tmp);
        $write(" RGPIO_IN: %h", tmp);
end
 
endtask
 
//
// Display RGPIO_OUT register
//
task showout;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_OUT<<sh_addr, tmp);
        $write(" RGPIO_OUT: %h", tmp);
end
 
endtask
 
 
//
// Display RGPIO_OE register
//
task showoe;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_OE<<sh_addr, tmp);
        $write(" RGPIO_OE:%h", tmp);
end
 
endtask
 
//
// Display RGPIO_INTE register
//
task showinte;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_INTE<<sh_addr, tmp);
        $write(" RGPIO_INTE:%h", tmp);
end
 
endtask
 
//
// Display RGPIO_PTRIG register
//
task showptrig;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_PTRIG<<sh_addr, tmp);
        $write(" RGPIO_PTRIG:%h", tmp);
end
 
endtask
 
//
// Display RGPIO_AUX register
//
task showaux;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_AUX<<sh_addr, tmp);
        $write(" RGPIO_AUX:%h", tmp);
end
 
endtask
 
//
// Display RGPIO_CTRL register
//
task showctrl;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_CTRL<<sh_addr, tmp);
        $write(" RGPIO_CTRL: %h", tmp);
end
 
endtask
 
//
// Display RGPIO_INTS register
//
task showints;
 
reg     [31:0] tmp;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_INTS<<sh_addr, tmp);
        $write(" RGPIO_INTS:%h", tmp);
end
 
endtask
 
//
// Compare parameter with RGPIO_IN register
//
task comp_in;
input   [31:0]   val;
output          ret;
 
reg     [31:0]   tmp;
reg             ret;
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_IN<<sh_addr, tmp);
 
        if (tmp == val)
                ret = 1;
        else
                ret = 0;
end
 
endtask
 
//
// Get RGPIO_IN register
//
task getin;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_IN<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_OUT register
//
task getout;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_OUT<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_OE register
//
task getoe;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_OE<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_INTE register
//
task getinte;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_INTE<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_PTRIG register
//
task getptrig;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_PTRIG<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_AUX register
//
task getaux;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_AUX<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_CTRL register
//
task getctrl;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_CTRL<<sh_addr, tmp);
end
 
endtask
 
//
// Get RGPIO_INTS register
//
task getints;
output  [31:0]   tmp;
 
begin
        #100 tb_top.wb_master.rd(`GPIO_RGPIO_INTS<<sh_addr, tmp);
end
 
endtask
 
//
// Calculate a random and make it narrow to fit on GPIO I/O pins
//
task random_gpio;
output  [31:0]   tmp;
 
begin
        tmp = $random & ((1<<`GPIO_IOS)-1);
end
 
endtask
 
//
// Test operation of control bit RGPIO_CTRL[ECLK]
//
task test_eclk;
integer         l1, l2, l3;
integer         r1, r2, r3;
begin
 
        // Set external clock to low state
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        //
        // Phase 1
        //
        // GPIO uses WISHBONE clock to latch gpio_in
        //
 
        // Put something on gpio_in pins
        random_gpio(r1);
        tb_top.gpio_mon.set_gpioin(r1);
 
        // Reset GPIO_CTRL
        setctrl(0);
 
        // Wait for time to advance
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Read GPIO_RGPIO_IN
        getin(l1);
 
        //
        // Phase 2
        //
        // GPIO uses external clock to latch gpio_in
        //
 
        // Set GPIO to use external clock, NEC bit cleared
        setctrl(1 << `GPIO_RGPIO_CTRL_ECLK);
 
        // Put something else on gpio_in pins
        random_gpio(r2);
        tb_top.gpio_mon.set_gpioin(r2);
 
        // Make an external posedge clock pulse
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
        tb_top.gpio_mon.set_gpioeclk(1);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Read RGPIO_IN
        getin(l2);
 
        //
        // Phase 3
        //
        // Change GPIO inputs and WB clock but not external clock.
        // RGPIO_IN should not change.
        //
 
        // Put something else on gpio_in pins
        random_gpio(r3);
        tb_top.gpio_mon.set_gpioin(r3);
 
        // Wait for WB clock
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Read RGPIO_IN
        getin(l3);
 
        //
        // Phase 4
        //
        // Compare phases
        //
        if (l1 == r1 && l2 == r2 && l2 == l3)
                $write(".");
        else
                local_errs = local_errs + 1;
end
endtask
 
//
// Test operation of control bit RGPIO_CTRL[NEC]
//
task test_nec;
integer         l1, l2;
integer         r1, r2;
begin
        //
        // Phase 1
        //
        // Compare RGPIO_IN before and after negative edge
        //
 
        // Set external clock to low state
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Set GPIO to use external clock and set RGPIO_CTRL[NEC]
        setctrl(1 << `GPIO_RGPIO_CTRL_ECLK | 1 << `GPIO_RGPIO_CTRL_NEC);
 
        // Put random on gpio inputs
        random_gpio(r1);
        tb_top.gpio_mon.set_gpioin(r1);
 
        // Advance time by making an external negedge clock pulse
        tb_top.gpio_mon.set_gpioeclk(1);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Put something on gpio_in pins
        random_gpio(r2);
        tb_top.gpio_mon.set_gpioin(r2);
 
        // Make an external posedge clock pulse
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
        tb_top.gpio_mon.set_gpioeclk(1);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Read RGPIO_IN (should be the same as r1)
        getin(l1);
 
        // Make an external negedge clock pulse
        tb_top.gpio_mon.set_gpioeclk(1);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
        tb_top.gpio_mon.set_gpioeclk(0);
        @(posedge tb_top.clk);
        @(posedge tb_top.clk);
 
        // Read RGPIO_IN (should be the same as r2)
        getin(l2);
 
        //
        // Phase 2
        //
        // Compare phases
        //
//      $display("l1 %h  l2 %h  r1 %h  r2 %h", l1, l2, r1, r2);
        if (l1 == r1 && l2 == r2)
                $write(".");
        else
                local_errs = local_errs + 1;
end
endtask
 
//
// Test input polled mode, output mode and bidirectional
//
task test_simple;
integer         l1, l2, l3, l4;
integer         i, err;
begin
        $write("  Testing input mode ...");
 
        //
        // Phase 1
        //
        // Compare RGPIO_IN and gpio_in
        //
 
        // Set GPIO to use WB clock
        setctrl(0);
 
        err = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i +1) begin
                // Put something on gpio_in pins
                random_gpio(l1);
                tb_top.gpio_mon.set_gpioin(l1);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Read GPIO_RGPIO_IN
                getin(l2);
 
                // Compare gpio_in and RGPIO_IN. Should be equal.
                if (l1 != l2)
                        err = err + 1;
        end
 
        // Phase 2
        //
        // Output result for previous test
        //
        if (!err)
                $display(" OK");
        else
                failed;
 
        $write("  Testing output mode ...");
 
        //
        // Phase 3
        //
        // Compare RGPIO_OUT and gpio_out
        //
 
        err = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i +1) begin
                // Put something in RGPIO_OUT pins
                l1 = $random;
                setout(l1);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Read gpio_out
                tb_top.gpio_mon.get_gpioout(l2);
 
                // Compare gpio_out and RGPIO_OUT. Should be equal.
                if (l1 != l2)
                        err = err + 1;
        end
 
        // Phase 4
        //
        // Output result for previous test
        //
        if (!err)
                $display(" OK");
        else
                failed;
 
        $write("  Testing bidirectional I/O ...");
 
        //
        // Phase 5
        //
        // Compare RGPIO_OE and gpio_oen
        //
 
        err = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i +1) begin
                // Put something in RGPIO_OE pins
                l1 = $random;
                setoe(l1);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Read gpio_oen
                tb_top.gpio_mon.get_gpiooen(l2);
 
                // Compare gpio_oen and RGPIO_OE. Should be exactly opposite.
                if (l1 != ~l2)
                        err = err + 1;
        end
 
        // Phase 6
        //
        // Output result for previous test
        //
        if (!err)
                $display(" OK");
        else
                failed;
 
        $write("  Testing auxiliary feature ...");
 
        //
        // Phase 7
        //
        // Compare RGPIO_OUT, gpio_out, RGPIO_AUX and gpio_aux
        //
 
        err = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i +1) begin
                // Put something on gpio_aux pins
                l1 = $random;
                tb_top.gpio_mon.set_gpioaux(l1);
 
                // Put something in RGPIO_AUX pins
                l2 = $random;
                setaux(l2);
 
                // Put something in RGPIO_OUT pins
                l3 = $random;
                setout(l3);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Read gpio_out
                tb_top.gpio_mon.get_gpioout(l4);
 
                // Compare gpio_out, RGPIO_OUT, RGPIO_AUX and gpio_aux.
                // RGPIO_AUX specifies which gpio_aux bits and RGPIO_OUT 
                // bits are present on gpio_out and where
                if ((l1 & l2 | l3 & ~l2) != l4)
                        err = err + 1;
        end
 
        // Phase 8
        //
        // Output result for previous test
        //
        if (!err)
                $display(" OK");
        else
                failed;
 
end
endtask
 
//
// Test interrupts
//
task test_ints;
integer         l1, l2, l3, l4;
integer         i, rnd, err;
integer         r1;
begin
 
        $write("  Testing control bit RGPIO_CTRL[INTE] and RGPIO_CTRL[INT] ...");
 
        //
        // Phase 1
        //
        // Generate patterns on inputs in interrupt mode
        //
 
        // Disable spurious interrupt monitor
        ints_disabled = 0;
 
        err = 0;
        for( i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i + 1) begin
 
                // Set gpio_in pins
                r1 = ((1<<`GPIO_IOS)-1) & 'hffffffff;
                tb_top.gpio_mon.set_gpioin(r1);
 
                // Low level triggering
                setptrig(0);
 
                // Clear RGPIO_INTS
                setints(0);
 
                // Enable interrupts in RGPIO_CTRL
                setctrl(1 << `GPIO_RGPIO_CTRL_INTE);
 
                // Enable interrupts in RGPIO_INTE
                setinte(r1);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be zero.
                l1 = tb_top.gpio_top.wb_inta_o;
 
                // Clear gpio_in pins
                tb_top.gpio_mon.set_gpioin(0);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be one.
                l2 = tb_top.gpio_top.wb_inta_o;
 
                // Clear interrupt request
                setctrl(0);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be zero.
                l3 = tb_top.gpio_top.wb_inta_o;
 
                // Get RGPIO_INTS. Should be nonzero.
                getints(l4);
 
                // Check for errors
                if (l1 || !l2 || l3 || (l4 != r1)) begin
                        err = err +1;
                end
        end
 
        // Enable spurious interrupt monitor
        ints_disabled = 1;
 
        // Phase 2
        //
        // Check results
        //
        if (!err)
                $display(" OK");
        else
                failed;
end
endtask
 
//
// Test ptrig
//
task test_ptrig;
integer         l1, l2, l3;
integer         i, rnd, err;
integer         r1;
begin
        $write("  Testing ptrig features ...");
 
        //
        // Phase 1
        //
        // Generate patterns on inputs in interrupt mode
        //
 
        // Disable spurious interrupt monitor
        ints_disabled = 0;
 
        err = 0;
        for( i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i + 1) begin
 
                // Set bits to one
                r1 = ((1<<`GPIO_IOS)-1) & 'hffffffff;
 
                // Set gpio_in pins
                tb_top.gpio_mon.set_gpioin('h00000000);
 
                // Clear old interrupts
                setints(0);
 
                // High level triggering
                setptrig('hffffffff);
 
                // Enable interrupts in RGPIO_CTRL
                setctrl(1 << `GPIO_RGPIO_CTRL_INTE);
 
                // Enable interrupts in RGPIO_INTE
                setinte(r1);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be zero.
                l1 = tb_top.gpio_top.wb_inta_o;
 
                // Clear gpio_in pins
                tb_top.gpio_mon.set_gpioin('hffffffff);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be one.
                l2 = tb_top.gpio_top.wb_inta_o;
 
                // Clear interrupt request
                setctrl(0);
                setints(0);
 
                // Advance time
                @(posedge tb_top.clk);
                @(posedge tb_top.clk);
 
                // Sample interrupt request. Should be zero.
                l3 = tb_top.gpio_top.wb_inta_o;
 
                // Check for errors
                if (l1 || !l2 || l3)
                        err = err +1;
        end
 
        // Enable spurious interrupt monitor
        ints_disabled = 1;
 
        // Phase 2
        //
        // Check results
        //
        if (!err)
                $display(" OK");
        else
                failed;
end
endtask
 
//
// Do continues check for interrupts
//
always @(posedge tb_top.gpio_top.wb_inta_o)
        if (ints_disabled) begin
                $display("Spurious interrupt detected. ");
                failed;
                ints_working = 9876;
                $display;
        end
 
//
// Start of testbench test tasks
//
integer         i;
initial begin
`ifdef GPIO_DUMP_VCD
        $dumpfile("../out/tb_top.vcd");
        $dumpvars(0);
`endif
        nr_failed = 0;
        ints_disabled = 1;
        ints_working = 0;
        tb_top.gpio_mon.set_gpioin(0);
        tb_top.gpio_mon.set_gpioaux(0);
        tb_top.gpio_mon.set_gpioeclk(0);
        $display;
        $display("###");
        $display("### GPIO IP Core Verification ###");
        $display("###");
        $display;
        $display("I. Testing correct operation of RGPIO_CTRL control bits");
        $display;
 
 
        $write("  Testing control bit RGPIO_CTRL[ECLK] ...");
        local_errs = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i + 1)
                test_eclk;
        if (local_errs == 0)
                $display(" OK");
        else
                failed;
 
 
        $write("  Testing control bit RGPIO_CTRL[NEC] ...");
        local_errs = 0;
        for (i = 0; i < 10 * `GPIO_VERIF_INTENSITY; i = i + 1)
                test_nec;
        if (local_errs == 0)
                $display(" OK");
        else
                failed;
 
        test_ints;
 
        $display;
        $display("II. Testing modes of operation ...");
        $display;
 
        test_simple;
        test_ptrig;
 
        $display;
        $display("###");
        $display("### FAILED TESTS: %d ###", nr_failed);
        $display("###");
        $display;
        $finish;
end
 
endmodule
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[/] [gpio/] [tags/] [rel_1/] [bench/] [verilog/] [tb_tasks.v] - Blame information for rev 67

Line No.	Rev	Author	Line
1	8	lampret	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// GPIO Testbench Tasks ////`
4			`//// ////`
5			`//// This file is part of the GPIO project ////`
6			`//// http://www.opencores.org/cores/gpio/ ////`
7			`//// ////`
8			`//// Description ////`
9			`//// Testbench tasks. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// Nothing ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`