基于FPGA的VHDL语言的PWM波发生

良好的通过50M分频实现PWM波的产生，波形良好可调。

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-05-13 22:59  pwm\
     文件        4580  2013-05-13 01:50  pwm\div_f.bgn
     文件      169306  2013-05-13 01:50  pwm\div_f.bit
     文件         976  2013-05-13 01:47  pwm\div_f.bld
     文件        7680  2013-05-13 01:50  pwm\div_f.cmd_log
     文件         182  2013-05-13 01:50  pwm\div_f.drc
     文件           6  2013-05-13 01:46  pwm\div_f.lso
     文件       13098  2013-05-13 01:47  pwm\div_f.ncd
     文件       15588  2013-05-13 01:47  pwm\div_f.ngc
     文件       24093  2013-05-13 01:47  pwm\div_f.ngd
     文件        4221  2013-05-13 01:47  pwm\div_f.ngr
     文件        6732  2013-05-13 01:47  pwm\div_f.pad
     文件        7313  2013-05-13 01:47  pwm\div_f.par
     文件         410  2013-05-13 01:47  pwm\div_f.pcf
     文件          21  2013-05-13 01:46  pwm\div_f.prj
     文件       17228  2013-05-13 01:47  pwm\div_f.ptwx
     文件           0  2013-05-13 01:47  pwm\div_f.stx
     文件       13854  2013-05-13 01:47  pwm\div_f.syr
     文件        2928  2013-05-13 01:47  pwm\div_f.twr
     文件       19348  2013-05-13 01:47  pwm\div_f.twx
     文件         155  2013-05-13 01:47  pwm\div_f.unroutes
     文件         392  2013-05-13 01:50  pwm\div_f.ut
     文件          46  2013-05-13 01:47  pwm\div_f.xpi
     文件        1134  2013-05-13 01:46  pwm\div_f.xst
     文件         197  2013-05-13 01:50  pwm\div_f_bitgen.xwbt
     文件       12664  2013-05-13 22:59  pwm\div_f_envsettings.html
     文件       13098  2013-05-13 01:47  pwm\div_f_guide.ncd
     文件        2628  2013-05-13 01:47  pwm\div_f_map.map
     文件        5716  2013-05-13 01:47  pwm\div_f_map.mrp
     文件       10166  2013-05-13 01:47  pwm\div_f_map.ncd
     文件       45053  2013-05-13 01:47  pwm\div_f_map.ngm
............此处省略63个文件信息