The program utilizes the ISE software FPGA to control the issue of PWM waveform, and gave a simple algorithm, frequency adjustable

PWM_LED
.......\CLK_IN.tfi
.......\CLK_IN.v
.......\CLK_IN_arwz.ucf
.......\contrl.v
.......\ipcore_dir
.......\..........\CLK_IN.v
.......\..........\CLK_IN.xaw
.......\..........\CLK_IN_arwz.ucf
.......\..........\CLK_IN_flist.txt
.......\..........\coregen.log
.......\..........\create_CLK_IN.tcl
.......\..........\tmp
.......\..........\...\_cg
.......\..........\xaw2verilog.log
.......\..........\_xmsgs
.......\..........\......\cg.xmsgs
.......\iseconfig
.......\.........\PWM_LED.projectmgr
.......\.........\PWM_LED.xreport
.......\MOL.V
.......\netgen
.......\......\synthesis
.......\......\.........\PWM_LED_synthesis.nlf
.......\......\.........\PWM_LED_synthesis.v
.......\pa.fromNetlist.tcl
.......\planAhead.ngc2edif.log
.......\planAhead_run_1
.......\...............\planAhead.jou
.......\...............\planAhead.log
.......\...............\planAhead_run.log
.......\...............\PWM_LED.data
.......\...............\............\constrs_1
.......\...............\............\.........\fileset.xml
.......\...............\............\runs
.......\...............\............\....\impl_1.psg
.......\...............\............\....\runs.xml
.......\...............\............\sources_1
.......\...............\............\.........\fileset.xml
.......\...............\............\wt
.......\...............\............\..\webtalk_pa.xml
.......\...............\PWM_LED.ppr
.......\pwm_led.bgn
.......\pwm_led.bit
.......\PWM_LED.bld
.......\PWM_LED.cfi
.......\PWM_LED.cmd_log
.......\pwm_led.drc
.......\PWM_LED.gise
.......\PWM_LED.lso
.......\PWM_LED.mcs
.......\PWM_LED.ncd
.......\PWM_LED.ngc
.......\PWM_LED.ngd
.......\PWM_LED.ngr
.......\PWM_LED.pad
.......\PWM_LED.par
.......\PWM_LED.pcf
.......\PWM_LED.prj
.......\PWM_LED.prm
.......\PWM_LED.ptwx
.......\PWM_LED.stx
.......\PWM_LED.syr
.......\PWM_LED.twr
.......\PWM_LED.twx
.......\PWM_LED.ucf
.......\PWM_LED.unroutes
.......\PWM_LED.ut
.......\PWM_LED.xise
.......\PWM_LED.xpi
.......\PWM_LED.xst
.......\PWM_LED_bitgen.xwbt
.......\PWM_LED_envsettings.html
.......\PWM_LED_guide.ncd
.......\PWM_LED_map.map
.......\PWM_LED_map.mrp
.......\PWM_LED_map.ncd
.......\PWM_LED_map.ngm
.......\PWM_LED_map.xrpt
.......\PWM_LED_ngdbuild.xrpt
.......\PWM_LED_pad.csv
.......\PWM_LED_pad.txt
.......\PWM_LED_par.xrpt
.......\PWM_LED_summary.html
.......\PWM_LED_summary.xml
.......\PWM_LED_usage.xml
.......\PWM_LED_xst.xrpt
.......\usage_statistics_webtalk.html
.......\webtalk.log
.......\webtalk_pn.xml
.......\xaw2verilog.log
.......\xlnx_auto_0_xdb
.......\...............\cst.xbcd
.......\xst
.......\...\dump.xst
.......\...\........\PWM_LED.prj
.......\...\........\...........\ngx
.......\...\........\...........\...\notopt
.......\...\........\...........\...\opt
.......\...\projnav.tmp

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