This a four-digit digital stopwatch, accurate to 0.01 seconds, three buttons, three buttons, a reset, a beginning, a stop, run Digilent' s basys2 development board, you can only modify ucf constraints in other FPGA development board to run.

Second_Counter\.lso
..............\Clk1k_Clk100.cmd_log
..............\Clk1k_Clk100.prj
..............\Clk1k_Clk100.stx
..............\Clk1k_Clk100.vhd
..............\Clk1k_Clk100.vhi
..............\Clk1k_Clk100.xst
..............\Clk1k_Clk100_vhdl.prj
..............\Clk50m_Clk1k.cmd_log
..............\Clk50m_Clk1k.prj
..............\Clk50m_Clk1k.stx
..............\Clk50m_Clk1k.vhd
..............\Clk50m_Clk1k.vhi
..............\Clk50m_Clk1k.xst
..............\Clk50m_Clk1k_summary.html
..............\Clk50m_Clk1k_vhdl.prj
..............\Controller.cmd_log
..............\Controller.prj
..............\Controller.stx
..............\Controller.vhd
..............\Controller.vhi
..............\Controller.xst
..............\Controller_vhdl.prj
..............\fuse.log
..............\fuse.xmsgs
..............\fuseRelaunch.cmd
..............\iseconfig\Clk50m_Clk1k.xreport
..............\.........\Second_Counter_Divide.projectmgr
..............\.........\Top_File.xreport
..............\..im\isim_usage_statistics.html
..............\....\pn_info
..............\....\.recompiled.exe.sim\ieee\p_2592010699.c
..............\....\...................\....\p_2592010699.didat
..............\....\...................\....\p_2592010699.nt64.obj
..............\....\...................\....\p_3499444699.c
..............\....\...................\....\p_3499444699.didat
..............\....\...................\....\p_3499444699.nt64.obj
..............\....\...................\....\p_3620187407.c
..............\....\...................\....\p_3620187407.didat
..............\....\...................\....\p_3620187407.nt64.obj
..............\....\Test_isim_beh.exe.sim\isimcrash.log
..............\....\.....................\ISimEngine-DesignHierarchy.dbg
..............\....\.....................\isimkernel.log
..............\....\.....................\libPortability.dll
..............\....\.....................\netId.dat
..............\....\.....................\Test_isim_beh.exe
..............\....\.....................\tmp_save\_1
..............\....\.....................\work\a_0177457267_3212880686.c
..............\....\.....................\....\a_0177457267_3212880686.didat
..............\....\.....................\....\a_0177457267_3212880686.nt64.obj
..............\....\.....................\....\a_1208337864_3212880686.c
..............\....\.....................\....\a_1208337864_3212880686.didat
..............\....\.....................\....\a_1208337864_3212880686.nt64.obj
..............\....\.....................\....\a_1303528114_3212880686.c
..............\....\.....................\....\a_1303528114_3212880686.didat
..............\....\.....................\....\a_1303528114_3212880686.nt64.obj
..............\....\.....................\....\a_1985558087_2372691052.c
..............\....\.....................\....\a_1985558087_2372691052.didat
..............\....\.....................\....\a_1985558087_2372691052.nt64.obj
..............\....\.....................\....\a_2521346364_3212880686.c
..............\....\.....................\....\a_2521346364_3212880686.didat
..............\....\.....................\....\a_2521346364_3212880686.nt64.obj
..............\....\.....................\....\a_3626484787_3212880686.c
..............\....\.....................\....\a_3626484787_3212880686.didat
..............\....\.....................\....\a_3626484787_3212880686.nt64.obj
..............\....\.....................\....\a_4240337396_3212880686.c
..............\....\.....................\....\a_4240337396_3212880686.didat
..............\....\.....................\....\a_4240337396_3212880686.nt64.obj
..............\....\.....................\....\Test_isim_beh.exe_main.c
..............\....\.....................\....\Test_isim_beh.exe_main.nt64.obj
..............\....\work\clk1k_clk100.vdb
..............\....\....\clk50m_clk1k.vdb
..............\....\....\controller.vdb
..............\....\....\second_counter.vdb
..............\....\....\seg7_scan_display.vdb
..............\....\....\test.vdb
..............\....\....\top_file.vdb
.........

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